UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-CSR CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number 811-02688 Name of Fund: BlackRock Municipal Bond Fund, Inc. Fund Address: P.O. Box 9011 Princeton, NJ 08543-9011 Name and address of agent for service: Robert C. Doll, Jr., Chief Executive Officer, BlackRock Municipal Bond Fund, Inc., 800 Scudders Mill Road, Plainsboro, NJ, 08536. Mailing address: P.O. Box 9011, Princeton, NJ, 08543-9011 Registrant's telephone number, including area code: (800) 441-7762 Date of fiscal year end: 06/30/07 Date of reporting period: 07/01/06 - 06/30/07 Item 1 - Report to Stockholders EQUITIES FIXED INCOME REAL ESTATE LIQUIDITY ALTERNATIVES BLACKROCK SOLUTIONS BlackRock Municipal Bond Fund, Inc. ANNUAL REPORT JUNE 30, 2007 BlackRock Short-Term Municipal Fund BlackRock Municipal Insured Fund BlackRock National Municipal Fund BlackRock High Yield Municipal Fund (BLACKROCK logo) NOT FDIC INSURED MAY LOSE VALUE NO BANK GUARANTEE This report is transmitted to shareholders only. It is not authorized for use as an offer of sale or a solicitation of an offer to buy shares of the Funds unless accompanied or preceded by the Fund's current prospectus. Past performance results shown in this report should not be considered a representation of future performance. Investment return and principal value of shares will fluctuate so that shares, when redeemed, may be worth more or less than their original cost. Statements and other information herein are as dated and are subject to change. (GO PAPERLESS... logo) It's Fast, Convenient, & Timely! To sign up today, go to www.blackrock.com/edelivery. BlackRock Municipal Bond Fund, Inc. Swap Agreements BlackRock Municipal Insured Fund, BlackRock National Municipal Fund and BlackRock High Yield Municipal Fund of BlackRock Municipal Bond Fund, Inc. may invest in swap agreements, which are over-the-counter contracts in which one party agrees to make periodic payments based on the change in market value of a specified bond, basket of bonds or index in return for periodic payments based on a fixed or variable interest rate or the change in market value of a different bond, basket of bonds or index. Swap agreements may be used to obtain exposure to a bond or market without owning or taking physical custody of securities. Swap agreements involve the risk that the party with whom the Fund has entered into a swap will default on its obligation to pay the Fund and the risk that the Fund will not be able to meet its obligations to pay the other party to the agreement. The swap agreements in which the Fund may invest includes credit default swap agreements. Important Tax Information All of the net investment income distributions paid monthly by BlackRock Short-Term Municipal Fund, BlackRock Municipal Insured Fund, BlackRock National Municipal Fund and BlackRock High Yield Municipal Fund of BlackRock Municipal Bond Fund, Inc. during the taxable year ended June 30, 2007 qualify as tax-exempt interest dividends for federal income tax purposes. Additionally, the following table summarizes the taxable per share distribution paid by BlackRock Municipal Insured Fund during the year: Long-Term Record Payable Ordinary Capital Date Date Income Gains 12/18/2006 12/20/2006 $.000392 $.041863 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 A Letter to Shareholders Dear Shareholder At the mid-point of 2007, investor sentiment appeared quite buoyant, notwithstanding some undertones of caution. For equity markets, positive momentum as the year began was interrupted by a notable but transitory set-back at the end of February. Markets resumed their ascent through May, but entered a trading range in June as investors began to question the sustainability of the rally. For the most part, equities found support in robust merger-and-acquisition activity, healthy global economies, tame inflation, relatively low interest rates, still-positive earnings growth and attractive valuations. These tailwinds prevailed over such headwinds as a weakening U.S. economy, slowing housing market, credit-related lending problems, escalating geopolitical concerns and high energy prices, leading the Standard & Poor's (S&P) 500 Index to a new record high in May. Meanwhile, turmoil in the subprime mortgage market and generally mixed economic signals weighed on bonds. In June, bond prices dropped precipitously as long-term yields rose to their highest levels in five years. The 10-year Treasury yield, which began 2007 at 4.68%, reached nearly 5.30% in mid-June before retracing to 5.03% by month's end. Notably, this year has brought some re-steepening of the yield curve, which had been flat to inverted throughout 2006. Still, at the end of June, yields along the curve remained below the federal funds rate of 5.25%, the level at which the Federal Reserve Board (the Fed) has left it since first pausing in August 2006. While first-quarter gross domestic product growth of 0.7% represented the slowest rate of expansion since 2002, the Fed reiterated that inflation, not a slowing economy, remains its primary concern. Many observers interpreted the Fed's reaction to mean that the economy has hit its low and is bound for renewed strength, thereby reducing the likelihood of an interest rate cut in the near future. Against this backdrop, the major equity market indexes posted strong returns for the annual and semi-annual periods ended June 30, 2007, while fixed income assets were more mixed: Total Returns as of June 30, 2007 6-month 12-month U.S. equities (S&P 500 Index) + 6.96% +20.59% Small cap U.S. equities (Russell 2000 Index) + 6.45 +16.43 International equities (MSCI Europe, Australasia, Far East Index) +10.74 +27.00 Fixed income (Lehman Brothers U.S. Aggregate Bond Index) + 0.98 + 6.12 Tax-exempt fixed income (Lehman Brothers Municipal Bond Index) + 0.14 + 4.69 High yield bonds (Lehman Brothers U.S. Corporate High Yield 2% Issuer Cap Index) + 2.96 +11.22 We expect market volatility to linger throughout the second half of 2007. As you navigate the uncertainties, we encourage you to review your investment goals with your financial professional and to make portfolio changes, as needed. For more market insight, we invite you to view "What's Ahead in 2007: The Second-Quarter Update" and "Are You Prepared for Volatility?" at www.blackrock.com/funds. We thank you for entrusting BlackRock with your investment assets, and we look forward to continuing to serve you in the months and years ahead. Sincerely, (Robert C. Doll, Jr.) Robert C. Doll, Jr. Fund President and Director THIS PAGE NOT PART OF YOUR FUND REPORT BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 A Discussion With Your Funds' Portfolio Managers A rise in market rates toward the end of the period, combined with a record- setting pace of new issuance in the municipal market, provided some new investment opportunities for the portfolios. Describe the recent market environment relative to municipal bonds. Over the past 12 months, long-term bond yields generally moved lower as bond prices, which move opposite of yields, increased. The long-term tax-exempt bond market's solid technical position allowed it to outperform the taxable U.S Treasury market during the period. As the 12-month period began, bond prices were improving (and yields falling) amid a backdrop of weakening economic growth. The bond price improvement accelerated in response to the Federal Reserve Board's (the Fed's) decision in August 2006 to keep its target interest rate on hold at 5.25% after 17 consecutive interest rate hikes since mid-2004. The rally continued in the fall amid moderating oil prices and slower gross domestic product (GDP) growth. By the end of November 2006, 30-year U.S. Treasury bond yields had fallen to 4.56%, a decline of 47 basis points (.47%) from June 30. In recent months, strong U.S. equity markets, continued moderate employment growth, higher bond yields overseas and growing investor conviction that the Fed would keep interest rates steady for the remainder of 2007 combined to push bond prices lower, erasing much of the market's earlier gains. At the end of June 2007, 30-year Treasury bond yields stood at 5.12%, a decline of 7 basis points year-over-year. Ten-year Treasury yields fell 12 basis points to 5.03% during the same period. The long-term tax-exempt bond market outperformed U.S. Treasury issues over the 12 months as investor demand outstripped a resurgent new-issue calendar. As measured by Municipal Market Data, yields on 30-year, AAA-rated issues declined 19 basis points to 4.44%. Meanwhile, yields on intermediate-maturity bonds fell less than those with longer maturities, as the Fed's string of interest rate hikes in 2005 and 2006, coupled with stronger investor demand for longer-maturity issues, resulted in a flattening of the municipal yield curve. Yields on 10-year, AAA-rated municipal bonds declined 7 basis points to 4.07%. In the municipal money market, yields rose modestly over the 12-month period. Investor demand for municipal product remained strong throughout the year. Statistics from the Investment Company Institute indicate that tax-exempt mutual funds received more than $13.7 billion in net new cash flows in the first five months of 2007, an increase of over 119% compared to the same period in 2006. This pace softened somewhat in June as the increasing bond yields made individual municipal bond purchases attractive compared to the relatively stable yields generated by tax-exempt mutual funds. Weekly fund flows, as measured by AMG Data, averaged $434 million during the second quarter of 2007, down from a weekly average of $474 million in the first quarter of the year. Still, the second quarter flows were almost twice those seen in second quarter 2006. Supporting the healthy demand for tax-exempt products has been strong seasonal cash flows. In June, investors received approximately $40 billion from bond maturities, coupon income and the proceeds from various early redemptions, and are expected to receive an additional $35 billion in July. As investor demand has strengthened, so has municipal bond supply. In second quarter 2007, municipalities issued over $112 billion in new tax-exempt securities, an increase of 12% relative to second quarter 2006. Year-to-date issuance has exceeded $226 billion, a 26% increase versus the same period a year ago and more than 8% ahead of 2005's record volume. Over the past 12 months, more than $431 billion in new tax-exempt bonds was marketed, an increase of 13% compared to a year ago. The new-issue calendar continues to be dominated by large underwritings exceeding $1 billion in size. These larger deals have continued to meet with strong demand, resulting in minimal, if any, market disruption. The market's technical position appears reasonably balanced, as the heavy new issuance has been met with continued strong demand. We expect that both traditional and non-traditional investors will continue to be drawn to the municipal market given relatively stable tax-exempt yield ratios and the steepness of the municipal curve compared to the taxable curve. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 BlackRock Short-Term Municipal Fund How did the Fund perform during the fiscal year in light of the existing market conditions? For the 12-month period ended June 30, 2007, BlackRock Short-Term Municipal Fund's BlackRock, Institutional, Investor A, Investor A1, Investor B and Investor C Shares had total returns of +3.42%, +3.32%, +3.05%, +3.21%, +2.95% and +2.29%, respectively. (Fund results shown do not reflect sales charges and would be lower if sales charges were included. Complete performance information can be found on pages 9 - 15 of this report to shareholders.) For the same period, the Fund's unmanaged benchmarks, the Lehman Brothers Municipal Bond 3-Year General Obligation Index and the Lehman Brothers Municipal Bond Index, had respective returns of +3.76% and +4.69%. The Fund's comparable Lipper category of Short Municipal Debt Funds posted an average return of +3.20% for the 12-month period. (Funds in the Short Municipal Debt Funds category invest primarily in municipal debt issues with dollar-weighted average maturities of less than three years.) The historical flatness of the municipal yield curve has meant that the short end of the curve, in which we invest, has underperformed the longer end on a total return basis. This would account for the Fund's underperformance of the Lehman indexes, which cover broader maturity ranges than those in which the Fund can invest. Fund performance for the fiscal year compared more favorably to that of its Lipper peers. (Notably, funds in the Lipper group with the ability to purchase longer-dated securities outperformed.) Although the Fund maintained a neutral to slightly short duration for much of the year, a defensive move designed to protect the portfolio in case of rising interest rates, the negative impact felt at the short end of the curve detracted from performance versus the peer group average. However, yields rose across the curve in June and the Fund's short duration aided performance in the final month of the period. What changes were made to the portfolio during the period? We generally maintained a conservative approach throughout the fiscal year. Our goal was to limit volatility in the Fund's underlying value, while also seeking a yield advantage over traditional tax-free money market funds. In the first six months of the fiscal year, most of our new investments were made in the two-year portion of the municipal yield curve. It was in the first half of the period that the Fed initially paused in its rate-hiking campaign and vowed data dependence in determining future monetary policy. We believed that the market would remain relatively stable given the Fed's stance. In addition, the municipal yield curve was extremely flat, with investments in the three-year and four-year range offering little or no yield advantage over those with one-year and two-year maturities. In the latter half of the fiscal year, we kept the Fund's average maturity slightly below average, as the yield curve provided little incentive to extend duration. In late May, after a sharp rise in bond yields resulted in some re-steepening of the yield curve, we drew down the Fund's cash position and invested in cash-equivalent variable rate demand notes. In terms of credit quality, the Fund maintained an average rating of AA. How would you characterize the Fund's position at the close of the period? We continue to maintain a high-quality portfolio that we believe is well positioned for the prevailing environment. Specifically, we anticipate that the yield curve will remain flat for a prolonged period, and that the Fed will continue its wait-and-see approach to monetary policy. Although the yield curve steepened modestly toward the end of the period, we do not see enough yield incentive to become more aggressive in our approach given the volatile market backdrop. Peter J. Hayes Senior Portfolio Manager Helen Marie Sheehan Portfolio Manager We are pleased to announce that Helen Marie Sheehan has joined the Fund's portfolio management team, effective July 20, 2007. Ms. Sheehan is a Director with BlackRock Inc. Prior to joining BlackRock in 2006, she was a Director with Merrill Lynch Investment Managers (MLIM) from 2000 to 2006 and a Vice President thereof from 1994 to 2000. Ms. Sheehan has been a portfolio manager with BlackRock or MLIM since 1985. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 A Discussion With Your Funds' Portfolio Managers (continued) BlackRock Municipal Insured Fund How did the Fund perform during the fiscal year in light of the existing market conditions? For the 12-month period ended June 30, 2007, BlackRock Municipal Insured Fund's Institutional, Investor A, Investor B, Investor C and Investor C1 Shares had total returns of +4.60%, +4.47%, +3.95%, +3.70% and +3.90%, respectively. (Fund results shown do not reflect sales charges and would be lower if sales charges were included. Complete performance information can be found on pages 9 - 15 of this report to shareholders.) For the same period, the broad-market Lehman Brothers Municipal Bond Index returned +4.69%. Notably, the index measures the performance of insured and uninsured municipal bonds throughout the nation, while the Fund focuses on higher-quality insured issues. Fund returns generally outpaced the +3.79% average return of the Lipper Insured Municipal Debt Funds category for the 12-month period. (Funds in this Lipper category invest primarily in municipal debt issues insured as to timely payment.) For the most part, we attribute the portfolio's strong relative performance to our yield curve positioning, particularly in the first half of the year, and our strategy of favoring refundable issues. In the first six months, we were generally overweight in bonds with maturities greater than 20 years, which helped the Fund's relative performance as the municipal yield curve flattened and the prices on longer-maturity bonds increased sharply. That dynamic had subsided somewhat in the second half of the fiscal period, but the Fund continued to benefit from the advance refunding of several holdings. When municipal bonds are advance refunded, or refinanced ahead of their maturity date, their prices generally increase sharply. In the first six months of 2007, we saw a significant pick-up in refunding activity as interest rates remained historically low. We continue to look for bonds with the potential to be advance refunded. What changes were made to the portfolio during the period? We adjusted the Fund's duration throughout period, moving from a defensive to relatively neutral stance. As interest rates rose significantly toward the end of the period, we took a more constructive view of the market. This entailed moving our focus further out on the municipal yield curve, targeting investments in the 20-year to 25-year maturity range. Our efforts were aided by the notable increase in municipal bond supply across the curve. With new issuance on a record-setting pace, we were able to find bonds with coupons and maturities we desired. This facilitated our strategy of selling some recently advance refunded positions, as their book yields were not significantly above current market yields, and moving into higher-yielding current issues. In doing so, we focused on bonds that could be advance refunded in the future, primarily premium-coupon, high-quality bonds in the aforementioned maturity range. This will allow us to replicate the same types of trades again (that is, sell bonds with lower yields in exchange for bonds with higher yields as the curve steepens). Another way in which we achieved a more constructive view on the market was by realizing tax losses as interest rates rose (and prices correspondingly fell). For example, if we had a bond that declined in value because it was of a shorter nature (that is, a short maturity or shorter call date), we were willing to take a loss by selling it and investing in more market-sensitive securities that could appreciate as rates fall (and prices rise). This also served to enforce our tax-efficient investment strategy, in that we were able to offset any capital gains in the portfolio, which are taxable to our investors. Finally, we continue to find good relative value in bonds issued by the state of California and other high-tax and specialty states. Given the heavy supply across the board, these bonds were selling at attractive prices relative to the broader market while offering yield-enhancement potential. How would you characterize the Fund's position at the close of the period? Given the recent rise in market rates, we ended the period with a more constructive portfolio, from an interest rate perspective, than we've had in some time. Otherwise, the Fund remained fully invested and of the highest quality, with 100% of its holdings rated AAA with bond insurance. We intend to maintain our focus on bonds in the 20-year to 25-year maturity range, while seeking to enhance yield and preserve net asset value for our shareholders. As always, we intend to accomplish this using the most tax-efficient investment strategies. Michael A. Kalinoski, CFA Portfolio Manager Theodore R. Jaeckel, Jr., CFA Portfolio Manager Walter C. O'Connor, CFA Portfolio Manager BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 BlackRock National Municipal Fund How did the Fund perform during the fiscal year in light of the existing market conditions? For the 12-month period ended June 30, 2007, BlackRock National Municipal Fund's Institutional, Investor A, Investor B, Investor C and Investor C1 Shares had total returns of +5.06%, +4.71%, +4.18%, +3.91% and +4.23%, respectively. (Fund results shown do not reflect sales charges and would be lower if sales charges were included. Complete performance information can be found on pages 9 - 15 of this report to shareholders.) For the same period, the Fund's broad market benchmark, the Lehman Brothers Municipal Bond Index, returned +4.69% and the Lipper General Municipal Debt Funds category had an average return of +4.12%. (Funds in this Lipper category invest primarily in municipal debt issues in the top four credit-rating categories.) Fund performance for the fiscal year benefited from our ongoing strategy of maximizing the portfolio's current yield. The Fund's average coupon at period- end was 5.85%, compared to an average of 4.50% for the broader market, as measured by the 30-year Municipal Market Data scale. This has allowed the Fund to remain one of the highest-yielding among its peers. Over time, these above- average income distributions to shareholders serve to enhance total return. In the latter half of the period, we pared back the Fund's exposure to housing- related bonds given our concerns over the slowdown in the U.S. residential real estate market. This benefited performance as the housing sector saw a notable widening in credit spreads amid the turmoil in the subprime mortgage market. What changes were made to the portfolio during the period? We maintained a slightly short to neutral duration posture (a measure of sensitivity to interest rate movements) throughout the fiscal year, thereby minimizing interest rate timing and the risk inherent in that. Instead, we continued to focus our efforts on protecting the Fund's net asset value and delivering as high a current yield as possible within the context of a low- risk portfolio. We found little need to make many structural changes to the portfolio, as we are satisfied with the portfolio's com-position and the performance it has been able to generate. For that reason, most trading activity during the period could be characterized as reactive. That is, as bonds were called from the portfolio (a fairly common occurrence over the past year as municipal issuers capitalized on low interest rates to refinance their existing, higher- couponed debt), we carefully evaluated the market for opportunities to recommit those assets. We were content to allow call proceeds to build as cash reserves during periods when interest rates were inopportune, and then recommitted the funds when rates rose to more advantageous levels. For the most part, we have been rewarded for our patient approach to reinvesting the proceeds. This helped us to maintain the Fund's current income distribution, while also protecting the underlying net asset value. In the final quarter of the period, with short-term cash equivalent yields reaching an average of over 3.60%, it has been easier to exercise patience in our approach. Notably, the Fund's low turnover ratio also translates into enhanced tax efficiency, in that we have been able to avoid capital gains distributions, which have tax consequences for shareholders. The portfolio maintained an average credit quality of AA throughout the period. At period-end, less than 5% of the portfolio was rated below BBB. How would you characterize the Fund's position at the close of the period? The Fund ended the period in a slightly defensive position in terms of interest rate risk. We would look to return to a more neutral posture as interest rates rise. Specifically, if long-term market rates for high-quality securities were to approach the 5% range, we could envision becoming more constructive. We maintain our focus on high-quality bonds. Although credit spreads are widening, they remain very tight on a historical basis. The tight spreads mean there is little yield advantage to be realized from investment in lower- quality issues and, therefore, we are not inclined to take on the additional risk. We will continue to exercise patience in recommitting the proceeds realized from bond calls so as not to sacrifice the Fund's attractive structure - including the low price volatility and the attractive income distribution that we have been able to offer our shareholders. Walter C. O'Connor, CFA Senior Portfolio Manager Theodore R. Jaeckel, Jr., CFA Portfolio Manager BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 A Discussion With Your Funds' Portfolio Managers (concluded) BlackRock High Yield Municipal Fund How has the Fund performed since its inception? From its inception on August 1, 2006, through June 30, 2007, BlackRock High Yield Municipal Fund's Institutional, Investor A and Investor C Shares had total returns of +3.59%, +3.26% and +2.84%, respectively. (Fund results shown do not reflect sales charges and would be lower if sales charges were included. Complete performance information can be found on pages 9 - 15 of this report to shareholders.) For the same period, the Fund's broad market benchmark, the Lehman Brothers Municipal Bond Index, returned +3.39%, and the Lipper High Yield Municipal Debt Funds category posted an average return of +4.34%. (Funds in this Lipper category invest at least 50% of their assets in lower-rated municipal debt issues.) Most of the Fund's underperformance relative to its Lipper category average occurred in the most recent calendar quarter. Our above-average duration stance, which partly reflects the less-seasoned nature of the portfolio's current holdings, detracted from performance when rates rose significantly in the last three months. (Yields have declined in recent years, generating a more conservative interest rate risk profile for more-seasoned issues commonly held by the Fund's peers.) In addition, given the Fund's relatively new status, it is disadvantaged relative to its more-seasoned competitors, which have had the benefit of investing in a higher interest rate environment as well as an environment where credit spreads were wider than in the past year. Relative to the broader municipal market, the Fund has performed quite well. How have you managed the Fund since its inception? The Fund has seen a fairly steady flow of new assets since its inception and, as such, we have been focused on keeping the portfolio invested. We have established new positions in a variety of sectors, reflecting our efforts to diversify the portfolio. Our largest exposure at period-end remained in the health care sector, at 37% of net assets, followed by corporate-related debt at 15%, tax-backed debt at 12%, education at 9% and housing at 7%. The relatively heavy exposure in healthcare largely reflects issuance trends. In terms of its credit profile, the Fund is more conservative than its peers, largely reflecting a perceived lack of value in the high yield market. Credit spreads have remained quite tight, particularly compared to the widening we've seen in the taxable market, thereby failing to offer attractive value. As a result, a higher proportion of the portfolio is invested in AAA-rated and AA-rated issues, with commensurately lower exposure in non-investment-grade and non-rated paper. At period-end, approximately 24% of portfolio holdings were rated AAA, AA and A. This compares to an average of less than 5% for our high yield municipal benchmark. Roughly 22% of Fund holdings were rated BBB, which represents an overweighting relative to the benchmark, and 30% were non- rated, compared to the benchmark average of roughly 50%. We are looking to approach more neutral weightings as opportunities present themselves. We intend to exercise due diligence and patience to that end. How would you characterize the Fund's position at the close of the period? The Fund ended the period with an above-average duration, reflecting our outlook for lower interest rates, and with a relatively conservative credit profile. We will look to increase the yield in the portfolio through the purchase of lower-rated credits, but anticipate that this will take some time given issuance trends, the tightness of credit spreads and the perceived event risk in the marketplace. Most issuance has been in the health care sector, an area where we have already achieved ample exposure. We would ideally look for opportunities in the tax-backed sector and corporate-related debt, areas in which the portfolio is underweighted, but will proceed with caution and patience in an effort to limit downside risk. Given the underlying market backdrop, we are pleased with the Fund's progress in its first 11 months and believe the portfolio is well positioned to take advantage of any widening of spreads in the high yield municipal market. Theodore R. Jaeckel, Jr., CFA Portfolio Manager Walter C. O'Connor, CFA Portfolio Manager July 20, 2007 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Performance Data About Fund Performance Effective October 2, 2006, BlackRock Short-Term Municipal Fund's Class A, Class B and Class I Shares were redesignated Investor A1, Investor B and Institutional Shares, respectively. All Class C Shares of the BlackRock Short-Term Municipal Fund converted to Class A (now Investor A1) Shares on August 25, 2006 and are no longer outstanding. BlackRock Municipal Insured Fund's and BlackRock National Municipal Fund's Class A, Class B, Class C and Class I Shares were redesignated Investor A, Investor B, Investor C1 and Institutional Shares, respectively. BlackRock High Yield Municipal Fund's Class A, Class C and Class I Shares were redesignated Investor A, Investor C and Institutional Shares, respectively. Also, effective October 2, 2006 BlackRock Short-Term Municipal Fund's BlackRock Shares, Investor A Shares and Investor C Shares commenced operations and BlackRock Municipal Insured Fund's and BlackRock National Municipal Fund's Investor C Shares commenced operations. As previously communicated to shareholders, new sales charge schedules came into effect at the same time for certain of these shares. BlackRock Short-Term Municipal Fund * BlackRock Shares are not subject to any sales charge. BlackRock Shares bear no ongoing distribution or service fees and are available only to eligible investors. Prior to October 2, 2006, BlackRock Share performance results are those of the Institutional Shares (which have no distribution or service fees). * Institutional Shares are not subject to any sales charge. Institutional Shares bear no ongoing distribution or service fees and are available only to eligible investors. * Investor A Shares incur a maximum initial sales charge (front-end load) of 3% and a service fee of 0.25% per year (but no distribution fee). Prior to October 2, 2006, Investor A Share performance results are those of the Institutional Shares (which have no distribution or service fees) restated to reflect Investor A Share fees. * Investor A1 Shares incur a maximum initial sales charge (front-end load) of 1% and a service fee of 0.10% per year (but no distribution fee). * Investor B Shares are subject to a maximum contingent deferred sales charge of 1% declining to 0% after three years. In addition, Investor B Shares are subject to a distribution fee of 0.20% per year and a service fee of 0.15% per year. These shares automatically convert to Investor A1 Shares after approximately 10 years. (There is no initial sales charge for automatic share conversions.) * Investor C Shares are subject to a distribution fee of 0.75% per year and a service fee of 0.25% per year. In addition, Investor C shares are subject to a 1% contingent deferred sales charge if redeemed within one year of purchase. Prior to October 2, 2006, Investor C Share performance results are those of the Institutional Shares (which have no distribution or service fees) restated to reflect Investor C Share fees. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Performance Data (continued) BlackRock Municipal Insured Fund and BlackRock National Municipal Fund * Institutional Shares are not subject to any sales charge. Institutional Shares bear no ongoing distribution or service fees and are available only to eligible investors. * Investor A Shares incur a maximum initial sales charge (front-end load) of 4.25% and a service fee of 0.25% per year (but no distribution fee). * Investor B Shares are subject to a maximum contingent deferred sales charge of 4% declining to 0% after six years. In addition, Investor B Shares are subject to a distribution fee of 0.50% per year and a service fee of 0.25% per year. These shares automatically convert to Investor A Shares after approximately 10 years. (There is no initial sales charge for automatic share conversions.). * Investor C Shares are subject to a distribution fee of 0.75% per year and a service fee of 0.25% per year. In addition, Investor C shares are subject to a 1% contingent deferred sales charge if redeemed within one year of purchase. Prior to October 2, 2006, Investor C Share performance results are those of the Institutional Shares (which have no distribution or service fees) restated to reflect Investor C Share fees. * Investor C1 Shares are subject to a distribution fee of 0.55% per year and a service fee of 0.25% per year. In addition, Investor C1 shares are subject to a 1% contingent deferred sales charge if redeemed within one year of purchase. BlackRock High Yield Municipal Fund * Institutional Shares are not subject to any sales charge. Institutional Shares bear no ongoing distribution or service fees and are available only to eligible investors. * Investor A Shares incur a maximum initial sales charge (front-end load) of 4.25% and a service fee of 0.25% per year (but no distribution fee). * Investor C Shares are subject to a distribution fee of 0.75% per year and a service fee of 0.25% per year. In addition, Investor C shares are subject to a 1% contingent deferred sales charge if redeemed within one year of purchase. Performance information reflects past performance and does not guarantee future results. Current performance may be lower or higher than the performance data quoted. Refer to www.blackrock.com to obtain performance data current to the most recent month-end. Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. Figures shown in each of the following tables assume reinvestment of all dividends and capital gain distributions, if any, at net asset value on the payable date. Investment return and principal value of shares will fluctuate so that shares, when redeemed, may be worth more or less than their original cost. Dividends paid to each class of shares will vary because of the different levels of service, distribution and transfer agency fees applicable to each class, which are deducted from the income available to be paid to shareholders. The Funds' Manager (BlackRock Advisors, LLC) and the Funds' previous manager (Fund Asset Management, L.P.), reimbursed a portion of its management fee. Without such reimbursement, performance would have been lower. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Performance Data (continued) Recent Performance Results* 10-Year/ Since 6-Month 12-Month Inception Standardized As of June 30, 2007 Total Return Total Return Total Return 30-day Yield BlackRock Short-Term Municipal Fund BlackRock Shares +1.37% +3.42% +35.38% 3.53% BlackRock Short-Term Municipal Fund Institutional Shares +1.27 +3.32 +35.25 3.53 BlackRock Short-Term Municipal Fund Investor A Shares +1.14 +3.05 +31.91 3.18 BlackRock Short-Term Municipal Fund Investor A1 Shares +1.22 +3.21 +33.91 3.40 BlackRock Short-Term Municipal Fund Investor B Shares +1.09 +2.95 +30.39 3.18 BlackRock Short-Term Municipal Fund Investor C Shares +0.77 +2.29 +22.40 2.53 BlackRock Municipal Insured Fund Institutional Shares 0.00 +4.60 +63.85 3.93 BlackRock Municipal Insured Fund Investor A Shares -0.13 +4.47 +59.85 3.52 BlackRock Municipal Insured Fund Investor B Shares -0.38 +3.95 +52.14 3.13 BlackRock Municipal Insured Fund Investor C Shares -0.50 +3.70 +48.52 2.88 BlackRock Municipal Insured Fund Investor C1 Shares -0.40 +3.90 +51.21 3.10 BlackRock National Municipal Fund Institutional Shares +0.56 +5.06 +69.45 4.03 BlackRock National Municipal Fund Investor A Shares +0.35 +4.71 +65.18 3.66 BlackRock National Municipal Fund Investor B Shares +0.10 +4.18 +57.16 3.28 BlackRock National Municipal Fund Investor C Shares -0.04 +3.91 +53.23 2.98 BlackRock National Municipal Fund Investor C1 Shares +0.17 +4.23 +56.39 3.25 BlackRock High Yield Municipal Fund Institutional Shares +0.01 -- + 3.59 4.53 BlackRock High Yield Municipal Fund Investor A Shares -0.03 -- + 3.26 4.10 BlackRock High Yield Municipal Fund Investor C Shares -0.31 -- + 2.84 3.49 Lehman Brothers 3-Year General Obligation Bond Index++ +1.21 +3.76 +46.74 -- Lehman Brothers Municipal Bond Index++++ +0.14 +4.69 +69.80/+3.39 -- * Investment results shown do not reflect sales charges; results shown would be lower if a sales charge was included. Cumulative total investment returns are based on changes in net asset values for the periods shown, and assume reinvestment of all dividends and capital gains distributions at net asset value on the payable date. All of the Funds' 10-year/since inception total returns are for the 10-year period except for High Yield Municipal Fund's 10-year/since inception total returns, which are from 8/01/06. ++ This unmanaged Index consists of state and local government obligation bonds that mature in three - four years, rated Baa or better. The 10-year/since inception total return is for the 10-year period. ++++ This unmanaged Index consists of revenue bonds, prerefunded bonds, general obligation bonds and insured bonds, all of which mature within 30 years. 10-year/since inception total returns are for 10 years and from 8/01/06, respectively. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Performance Data (continued) BlackRock Short-Term Municipal Fund Total Return Based on a $10,000 Investment A line graph illustrating the growth of a $10,000 investment in BlackRock Shares*++, Institutional Shares*++, Investor A Shares*++, Investor A1 Shares*++, Investor B Shares*++, and Investor C Shares*++ compared to a similar investment in Lehman Brothers Municipal Bond Index++++ and Lehman Brothers 3-Year General Obligation Bond Index++++++. Values illustrated are as follows: BlackRock Shares*++ Date Value June 1997 $10,000.00 June 1998 $10,426.00 June 1999 $10,778.00 June 2000 $11,132.00 June 2001 $11,809.00 June 2002 $12,294.00 June 2003 $12,647.00 June 2004 $12,722.00 June 2005 $12,888.00 June 2006 $13,091.00 June 2007 $13,538.00 Institutional Shares*++ Date Value June 1997 $10,000.00 June 1998 $10,426.00 June 1999 $10,778.00 June 2000 $11,132.00 June 2001 $11,809.00 June 2002 $12,294.00 June 2003 $12,647.00 June 2004 $12,722.00 June 2005 $12,888.00 June 2006 $13,091.00 June 2007 $13,525.00 Investor A Shares*++ Date Value June 1997 $ 9,700.00 June 1998 $10,088.00 June 1999 $10,403.00 June 2000 $10,717.00 June 2001 $11,341.00 June 2002 $11,778.00 June 2003 $12,086.00 June 2004 $12,127.00 June 2005 $12,254.00 June 2006 $12,416.00 June 2007 $12,795.00 Investor A1 Shares*++ Date Value June 1997 $ 9,900.00 June 1998 $10,312.00 June 1999 $10,649.00 June 2000 $10,988.00 June 2001 $11,644.00 June 2002 $12,110.00 June 2003 $12,446.00 June 2004 $12,508.00 June 2005 $12,658.00 June 2006 $12,845.00 June 2007 $13,257.00 Investor B Shares*++ Date Value June 1997 $10,000.00 June 1998 $10,389.00 June 1999 $10,701.00 June 2000 $11,013.00 June 2001 $11,642.00 June 2002 $12,065.00 June 2003 $12,368.00 June 2004 $12,397.00 June 2005 $12,526.00 June 2006 $12,665.00 June 2007 $13,039.00 Investor C Shares*++ Date Value June 1997 $10,000.00 June 1998 $10,323.00 June 1999 $10,565.00 June 2000 $10,804.00 June 2001 $11,347.00 June 2002 $11,696.00 June 2003 $11,912.00 June 2004 $11,864.00 June 2005 $11,899.00 June 2006 $11,966.00 June 2007 $12,240.00 Lehman Brothers Municipal Bond Index++++ Date Value June 1997 $10,000.00 June 1998 $10,866.00 June 1999 $11,166.00 June 2000 $11,529.00 June 2001 $12,680.00 June 2002 $13,556.00 June 2003 $14,741.00 June 2004 $14,853.00 June 2005 $16,077.00 June 2006 $16,219.00 June 2007 $16,980.00 Lehman Brothers 3-Year General Obligation Bond Index++++++ Date Value June 1996 $10,000.00 June 1997 $10,537.00 June 1998 $10,924.00 June 1999 $11,324.00 June 2000 $12,191.00 June 2001 $12,933.00 June 2002 $13,574.00 June 2003 $13,658.00 June 2004 $14,010.00 June 2005 $14,143.00 June 2006 $14,674.00 * Assuming maximum sales charge, if any, transaction costs and other operating expenses, including advisory fees. ++ The Fund invests primarily in investment grade municipal bonds (bonds rated Baa or better) with a maximum maturity not to exceed four years. ++++ This unmanaged Index consists of revenue bonds, prerefunded bonds, general obligation bonds and insured bonds, all of which mature within 30 years. ++++++ This unmanaged Index consists of state and local government obligation bonds that mature in three - four years, rated Baa or better. Past performance is not indicative of future results. Average Annual Total Return Return BlackRock Shares One Year Ended 6/30/07 +3.42% Five Years Ended 6/30/07 +1.95 Ten Years Ended 6/30/07 +3.08 Return Institutional Shares One Year Ended 6/30/07 +3.32% Five Years Ended 6/30/07 +1.93 Ten Years Ended 6/30/07 +3.07 Return Without Return With Sales Charge Sales Charge* Investor A Shares One Year Ended 6/30/07 +3.05% -0.04% Five Years Ended 6/30/07 +1.67 +1.05 Ten Years Ended 6/30/07 +2.81 +2.50 Return Without Return With Sales Charge Sales Charge** Investor A1 Shares One Year Ended 6/30/07 +3.21% +2.18% Five Years Ended 6/30/07 +1.83 +1.62 Ten Years Ended 6/30/07 +2.96 +2.86 Return Return Without CDSC With CDSC++++++ Investor B Shares++ One Year Ended 6/30/07 +2.95% +1.95% Five Years Ended 6/30/07 +1.57 +1.57 Ten Years Ended 6/30/07 +2.69 +2.69 Return Return Without CDSC With CDSC++++++ Investor C Shares++++ One Year Ended 6/30/07 +2.29% +1.29% Five Years Ended 6/30/07 +0.91 +0.91 Ten Years Ended 6/30/07 +2.04 +2.04 * Assuming maximum sales charge of 3%. ** Assuming maximum sales charge of 1%. ++ Maximum contingent deferred sales charge is 1% and is reduced to 0% after three years. ++++ Maximum contingent deferred sales charge is 1% and is reduced to 0% after one year. ++++++ Assuming payment of applicable contingent deferred sales charge. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Performance Data (continued) BlackRock Municipal Insured Fund Total Return Based on a $10,000 Investment A line graph illustrating the growth of a $10,000 investment in Institutional Shares*++, Investor A Shares*++, Investor B Shares*++, Investor C Shares*++ and Investor C1 Shares*++ compared to a similar investment in Lehman Brothers Municipal Bond Index++++. Values illustrated are as follows: Institutional Shares*++ Date Value June 1997 $10,000.00 June 1998 $10,805.00 June 1999 $10,973.00 June 2000 $11,103.00 June 2001 $12,216.00 June 2002 $13,077.00 June 2003 $14,238.00 June 2004 $14,289.00 June 2005 $15,538.00 June 2006 $15,665.00 June 2007 $16,385.00 Investor A Shares*++ Date Value June 1997 $ 9,575.00 June 1998 $10,307.00 June 1999 $10,455.00 June 2000 $10,552.00 June 2001 $11,581.00 June 2002 $12,351.00 June 2003 $13,433.00 June 2004 $13,448.00 June 2005 $14,587.00 June 2006 $14,650.00 June 2007 $15,305.00 Investor B Shares*++ Date Value June 1997 $10,000.00 June 1998 $10,724.00 June 1999 $10,808.00 June 2000 $10,868.00 June 2001 $11,852.00 June 2002 $12,592.00 June 2003 $13,626.00 June 2004 $13,554.00 June 2005 $14,629.00 June 2006 $14,637.00 June 2007 $15,214.00 Investor C Shares*++ Date Value June 1997 $10,000.00 June 1998 $10,698.00 June 1999 $10,757.00 June 2000 $10,776.00 June 2001 $11,739.00 June 2002 $12,442.00 June 2003 $13,413.00 June 2004 $13,327.00 June 2005 $14,348.00 June 2006 $14,322.00 June 2007 $14,852.00 Investor C1 Shares*++ Date Value June 1997 $10,000.00 June 1998 $10,705.00 June 1999 $10,784.00 June 2000 $10,838.00 June 2001 $11,814.00 June 2002 $12,545.00 June 2003 $13,569.00 June 2004 $13,491.00 June 2005 $14,571.00 June 2006 $14,554.00 June 2007 $15,121.00 Lehman Brothers Municipal Bond Index++++ Date Value June 1997 $10,000.00 June 1998 $10,866.00 June 1999 $11,166.00 June 2000 $11,529.00 June 2001 $12,680.00 June 2002 $13,556.00 June 2003 $14,741.00 June 2004 $14,853.00 June 2005 $16,077.00 June 2006 $16,219.00 June 2007 $16,980.00 * Assuming maximum sales charge, if any, transaction costs and other operating expenses, including advisory fees. ++ The Fund invests primarily in long-term, investment grade municipal bonds bonds rated Baa or better) covered by portfolio insurance guaranteeing the timely payment of principal at maturity and interest. ++++ This unmanaged Index consists of revenue bonds, prerefunded bonds, general obligation bonds and insured bonds, all of which mature within 30 years. Past performance is not indicative of future results. Average Annual Total Return Return Institutional Shares One Year Ended 6/30/07 +4.60% Five Years Ended 6/30/07 +4.61 Ten Years Ended 6/30/07 +5.06 Return Without Return With Sales Charge Sales Charge* Investor A Shares One Year Ended 6/30/07 +4.47% +0.03% Five Years Ended 6/30/07 +4.38 +3.48 Ten Years Ended 6/30/07 +4.80 +4.35 Return Return Without CDSC With CDSC++++++ Investor B Shares++ One Year Ended 6/30/07 +3.95% -0.05% Five Years Ended 6/30/07 +3.86 +3.52 Ten Years Ended 6/30/07 +4.29 +4.29 Return Return Without CDSC With CDSC++++++ Investor C Shares++++ One Year Ended 6/30/07 +3.70% +2.70% Five Years Ended 6/30/07 +3.60 +3.60 Ten Years Ended 6/30/07 +4.03 +4.03 Return Return Without CDSC With CDSC++++++ Investor C1 Shares++++ One Year Ended 6/30/07 +3.90% +2.90% Five Years Ended 6/30/07 +3.81 +3.81 Ten Years Ended 6/30/07 +4.22 +4.22 * Assuming maximum sales charge of 4.25%. ++ Maximum contingent deferred sales charge is 4% and is reduced to 0% after six years. ++++ Maximum contingent deferred sales charge is 1% and is reduced to 0% after one year. ++++++ Assuming payment of applicable contingent deferred sales charge. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Performance Data (continued) BlackRock National Municipal Fund Total Return Based on a $10,000 Investment A line graph illustrating the growth of a $10,000 investment in Institutional Shares*++, Investor A Shares*++, Investor B Shares*++, Investor C Shares*++ and Investor C1 Shares*++ compared to a similar investment in Lehman Brothers Municipal Bond Index++++. Values illustrated are as follows: Institutional Shares*++ Date Value June 1997 $10,000.00 June 1998 $10,836.00 June 1999 $10,975.00 June 2000 $11,035.00 June 2001 $12,176.00 June 2002 $13,027.00 June 2003 $14,113.00 June 2004 $14,520.00 June 2005 $15,811.00 June 2006 $16,130.00 June 2007 $16,945.00 Investor A Shares*++ Date Value June 1997 $ 9,575.00 June 1998 $10,340.00 June 1999 $10,446.00 June 2000 $10,488.00 June 2001 $11,543.00 June 2002 $12,320.00 June 2003 $13,303.00 June 2004 $13,652.00 June 2005 $14,843.00 June 2006 $15,105.00 June 2007 $15,816.00 Investor B Shares*++ Date Value June 1997 $10,000.00 June 1998 $10,755.00 June 1999 $10,810.00 June 2000 $10,797.00 June 2001 $11,824.00 June 2002 $12,556.00 June 2003 $13,489.00 June 2004 $13,773.00 June 2005 $14,900.00 June 2006 $15,086.00 June 2007 $15,716.00 Investor C Shares*++ Date Value June 1997 $10,000.00 June 1998 $10,729.00 June 1999 $10,759.00 June 2000 $10,710.00 June 2001 $11,700.00 June 2002 $12,395.00 June 2003 $13,295.00 June 2004 $13,542.00 June 2005 $14,600.00 June 2006 $14,747.00 June 2007 $15,323.00 Investor C1 Shares*++ Date Value June 1997 $10,000.00 June 1998 $10,749.00 June 1999 $10,800.00 June 2000 $10,783.00 June 2001 $11,790.00 June 2002 $12,514.00 June 2003 $13,450.00 June 2004 $13,726.00 June 2005 $14,827.00 June 2006 $15,005.00 June 2007 $15,639.00 Lehman Brothers Municipal Bond Index++++ Date Value June 1997 $10,000.00 June 1998 $10,866.00 June 1999 $11,166.00 June 2000 $11,529.00 June 2001 $12,680.00 June 2002 $13,556.00 June 2003 $14,741.00 June 2004 $14,853.00 June 2005 $16,077.00 June 2006 $16,219.00 June 2007 $16,980.00 * Assuming maximum sales charge, if any, transaction costs and other operating expenses, including advisory fees. ++ The Fund invests primarily in long-term municipal bonds rated in any rating category. ++++ This unmanaged Index consists of revenue bonds, prerefunded bonds, general obligation bonds and insured bonds, all of which mature within 30 years. Past performance is not indicative of future results. Average Annual Total Return Return Institutional Shares One Year Ended 6/30/07 +5.06% Five Years Ended 6/30/07 +5.40 Ten Years Ended 6/30/07 +5.42 Return Without Return With Sales Charge Sales Charge* Investor A Shares One Year Ended 6/30/07 +4.71% +0.26% Five Years Ended 6/30/07 +5.12 +4.21 Ten Years Ended 6/30/07 +5.15 +4.69 Return Return Without CDSC With CDSC++++++ Investor B Shares++ One Year Ended 6/30/07 +4.18% +0.18% Five Years Ended 6/30/07 +4.59 +4.26 Ten Years Ended 6/30/07 +4.62 +4.62 Return Return Without CDSC With CDSC++++++ Investor C Shares++++ One Year Ended 6/30/07 +3.91% +2.91% Five Years Ended 6/30/07 +4.33 +4.33 Ten Years Ended 6/30/07 +4.36 +4.36 Return Return Without CDSC With CDSC++++++ Investor C1 Shares++++ One Year Ended 6/30/07 +4.23% +3.23% Five Years Ended 6/30/07 +4.56 +4.56 Ten Years Ended 6/30/07 +4.57 +4.57 * Assuming maximum sales charge of 4.25%. ++ Maximum contingent deferred sales charge is 4% and is reduced to 0% after six years. ++++ Maximum contingent deferred sales charge is 1% and is reduced to 0% after one year. ++++++ Assuming payment of applicable contingent deferred sales charge. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Performance Data (concluded) BlackRock High Yield Municipal Fund Total Return Based on a $10,000 Investment A line graph illustrating the growth of a $10,000 investment in Institutional Shares*++, Investor A Shares*++ and Investor C Shares*++ compared to a similar investment in Lehman Brothers Municipal Bond Index++++. Values illustrated are as follows: Institutional Shares*++ Date Value 8/01/2006 $10,000.00 June 2007 $10,359.00 Investor A Shares*++ Date Value 8/01/2006 $ 9,575.00 June 2007 $ 9,887.00 Investor C Shares*++ Date Value 8/01/2006 $10,000.00 June 2007 $10,184.00 Lehman Brothers Municipal Bond Index++++ Date Value 8/01/2006 $10,000.00 June 2007 $10,339.00 * Assuming maximum sales charge, if any, transaction costs and other operating expenses, including advisory fees. ** Commencement of operations. ++ The Fund invests primarily in municipal bonds rated in any rating category or in unrated municipal bonds. ++++ This unmanaged Index consists of revenue bonds, prerefunded bonds, general obligation bonds and insured bonds, all of which mature within 30 years. Past performance is not indicative of future results. Aggregate Total Return Return Institutional Shares Inception (8/01/06) to 6/30/07 +3.59% Return Without Return With Sales Charge Sales Charge* Investor A Shares Inception (8/01/06) to 6/30/07 +3.26% -1.13% Return Return Without CDSC With CDSC++++ Investor C Shares++ Inception (8/01/06) to 6/30/07 +2.84% +1.84% * Assuming maximum sales charge of 4.25%. ++ Maximum contingent deferred sales charge is 1% and is reduced to 0% after one year. ++++ Assuming payment of applicable contingent deferred sales charge. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Disclosure of Expenses Shareholders of these Funds may incur the following charges: (a) expenses related to transactions, including sales charges, redemption fees and exchange fees; and (b) operating expenses including advisory fees, distribution fees including 12b-1 fees, and other Fund expenses. The following example (which is based on a hypothetical investment of $1,000 invested on January 1, 2007 and held through June 30, 2007) is intended to assist shareholders both in calculating expenses based on an investment in the Fund and in comparing these expenses with similar costs of investing in other mutual funds. The first table of each Fund provides information about actual account values and actual expenses. In order to estimate the expenses a shareholder paid during the period covered by this report, shareholders can divide their account value by $1,000 and then multiply the result by the number in the first line under the heading entitled "Expenses Paid During the Period." The second table of each Fund provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses. In order to assist shareholders in comparing the ongoing expenses of investing in this Fund and other funds, compare the 5% hypothetical example with the 5% hypothetical examples that appear in other funds' shareholder reports. The expenses shown in the table are intended to highlight shareholders' ongoing costs only and do not reflect any transactional expenses, such as sales charges, redemption fees or exchange fees. Therefore, the second table is useful in comparing ongoing expenses only, and will not help shareholders determine the relative total expenses of owning different funds. If these transactional expenses were included, shareholder expenses would have been higher. BlackRock Short-Term Municipal Fund Expenses Paid Beginning Ending During the Period* Account Value Account Value January 1, 2007 January 1, 2007 June 30, 2007 to June 30, 2007 Actual BlackRock $1,000 $1,013.70 $1.75 Institutional $1,000 $1,012.70 $1.75 Investor A $1,000 $1,011.40 $3.04 Investor A1 $1,000 $1,012.20 $2.25 Investor B $1,000 $1,010.90 $3.49 Investor C $1,000 $1,007.70 $6.77 Hypothetical (5% annual return before expenses)** BlackRock $1,000 $1,023.06 $1.76 Institutional $1,000 $1,023.06 $1.76 Investor A $1,000 $1,021.78 $3.07 Investor A1 $1,000 $1,022.57 $2.26 Investor B $1,000 $1,021.33 $3.51 Investor C $1,000 $1,018.06 $6.81 * For each class of the Fund, expenses are equal to the annualized expense ratio for the class (.35% for BlackRock, .35% for Institutional, .61% for Investor A, .45% for Investor A1, .70% for Investor B and 1.36% for Investor C), multiplied by the average account value over the period, multiplied by 181/365 to reflect the one-half year period shown. ** Hypothetical 5% annual return before expenses is calculated by pro-rating the number of days in the most recent fiscal half year divided by 365. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Disclosure of Expenses (continued) BlackRock Municipal Insured Fund Including Interest Expense and Fees Expenses Paid Beginning Ending During the Period* Account Value Account Value January 1, 2007 January 1, 2007 June 30, 2007 to June 30, 2007 Actual Institutional $1,000 $1,000.00 $4.41 Investor A $1,000 $ 998.70 $5.65 Investor B $1,000 $ 996.20 $8.17 Investor C $1,000 $ 995.00 $9.45 Investor C1 $1,000 $ 996.00 $8.41 Hypothetical (5% annual return before expenses)** Institutional $1,000 $1,020.39 $4.46 Investor A $1,000 $1,019.15 $5.71 Investor B $1,000 $1,016.62 $8.25 Investor C $1,000 $1,015.33 $9.54 Investor C1 $1,000 $1,016.37 $8.50 * For each class of the Fund, expenses are equal to the annualized expense ratio for the class (.89% for Institutional, 1.14% for Investor A, 1.65% for Investor B, 1.91% for Investor C and 1.70% for Investor C1), multiplied by the average account value over the period, multiplied by 181/365 (to reflect the one-half year period shown). ** Hypothetical 5% annual return before expenses is calculated by pro-rating the number of days in the most fiscal half-year divided by 365. Excluding Interest Expense and Fees Expenses Paid Beginning Ending During the Period* Account Value Account Value January 1, 2007 January 1, 2007 June 30, 2007 to June 30, 2007 Actual Institutional $1,000 $1,000.00 $2.38 Investor A $1,000 $ 998.70 $3.67 Investor B $1,000 $ 996.20 $6.19 Investor C $1,000 $ 995.00 $7.52 Investor C1 $1,000 $ 996.00 $6.38 Hypothetical (5% annual return before expenses)** Institutional $1,000 $1,022.42 $2.41 Investor A $1,000 $1,021.13 $3.71 Investor B $1,000 $1,018.60 $6.26 Investor C $1,000 $1,017.26 $7.60 Investor C1 $1,000 $1,018.40 $6.46 * For each class of the Fund, expenses are equal to the annualized expense ratio for the class (.48% for Institutional, .74% for Investor A, 1.25% for Investor B, 1.52% for Investor C and 1.29% for Investor C1), multiplied by the average account value over the period, multiplied by 181/365 (to reflect the one-half year period shown). ** Hypothetical 5% annual return before expenses is calculated by pro-rating the number of days in the most recent fiscal half year divided by 365. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Disclosure of Expenses (continued) BlackRock National Municipal Fund Including Interest Expense and Fees Expenses Paid Beginning Ending During the Period* Account Value Account Value January 1, 2007 January 1, 2007 June 30, 2007 to June 30, 2007 Actual Institutional $1,000 $1,005.60 $ 5.02 Investor A $1,000 $1,003.50 $ 6.16 Investor B $1,000 $1,001.00 $ 8.68 Investor C $1,000 $ 999.60 $10.16 Investor C1 $1,000 $1,001.70 $ 8.93 Hypothetical (5% annual return before expenses)** Institutional $1,000 $1,019.79 $ 5.06 Investor A $1,000 $1,018.65 $ 6.21 Investor B $1,000 $1,016.12 $ 8.75 Investor C $1,000 $1,014.63 $10.24 Investor C1 $1,000 $1,015.87 $ 9.00 * For each class of the Fund, expenses are equal to the annualized expense ratio for the class (1.01% for Institutional, 1.24% for Investor A, 1.75% for Investor B, 2.05% for Investor C and 1.80% for Investor C1), multiplied by the average account value over the period, multiplied by 181/365 (to reflect the one-half year period shown). ** Hypothetical 5% annual return before expenses is calculated by pro-rating the number of days in the most fiscal half-year divided by 365. Excluding Interest Expense and Fees Expenses Paid Beginning Ending During the Period* Account Value Account Value January 1, 2007 January 1, 2007 June 30, 2007 to June 30, 2007 Actual Institutional $1,000 $1,005.60 $3.08 Investor A $1,000 $1,003.50 $4.27 Investor B $1,000 $1,001.00 $6.80 Investor C $1,000 $ 999.60 $8.23 Investor C1 $1,000 $1,001.70 $7.00 Hypothetical (5% annual return before expenses)** Institutional $1,000 $1,021.73 $3.11 Investor A $1,000 $1,020.54 $4.31 Investor B $1,000 $1,018.01 $6.85 Investor C $1,000 $1,016.57 $8.30 Investor C1 $1,000 $1,017.81 $7.05 * For each class of the Fund, expenses are equal to the annualized expense ratio for the class (.62% for Institutional, .86% for Investor A, 1.37% for Investor B, 1.66% for Investor C and 1.41% for Investor C1), multiplied by the average account value over the period, multiplied by 181/365 (to reflect the one-half year period shown). ** Hypothetical 5% annual return before expenses is calculated by pro-rating the number of days in the most recent fiscal half year divided by 365. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Disclosure of Expenses (concluded) BlackRock High Yield Municipal Fund Expenses Paid Beginning Ending During the Period* Account Value Account Value January 1, 2007 January 1, 2007 June 30, 2007 to June 30, 2007 Actual Institutional $1,000 $1,000.00 $2.38 Investor A $1,000 $ 998.70 $3.67 Investor C $1,000 $ 995.00 $7.52 Hypothetical (5% annual return before expenses)** Institutional $1,000 $1,022.42 $2.41 Investor A $1,000 $1,021.13 $3.71 Investor C $1,000 $1,017.26 $7.60 * For each class of the Fund, expenses are equal to the annualized expense ratio for the class (.61% for Institutional, .89% for Investor A and 1.49% for Investor C), multiplied by the average account value over the period, multiplied by 181/365 (to reflect the one-half year period shown). ** Hypothetical 5% annual return before expenses is calculated by pro-rating the number of days in the most recent fiscal half year divided by 365. Portfolio Information as of June 30, 2007 Percent of Long Term BlackRock Short-Term Municipal Fund Investments Other Revenue Bonds 52.1% General Obligation & Tax Revenue Bonds 33.1 Prerefunded Bonds 14.8 Percent of Long Term BlackRock Municipal Insured Fund Investments Other Revenue Bonds 69.1% General Obligation & Tax Revenue Bonds 19.4 Prerefunded Bonds 11.5 Percent of Long Term BlackRock National Municipal Fund Investments Other Revenue Bonds 74.0% General Obligation & Tax Revenue Bonds 11.7 Prerefunded Bonds 14.3 Percent of Long Term BlackRock High Yield Municipal Fund Investments Other Revenue Bonds 87.0% General Obligation & Tax Revenue Bonds 13.0 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments as of June 30, 2007 BlackRock Short-Term Municipal Fund (In Thousands) Face Amount Municipal Bonds Value Alabama--5.3% $ 6,075 Birmingham, Alabama, Special Care Facilities Financing Authority Revenue Bonds (Ascension Health Subordinate Credit Group), Series A, 5% due 10/01/2008 $ 6,158 8,095 Huntsville, Alabama, GO, Refunding, Series A, 5.25% due 2/01/2009 (j) 8,271 Arizona--3.0% 1,376 Tierra Antigua, Arizona, Revenue Bonds, VRDN, AMT, Series A, 3.76% due 12/01/2034 (b) 1,376 7,000 Yavapai County, Arizona, IDA, Solid Waste Disposal Revenue Bonds (Waste Management Inc. Project), AMT, 4% due 6/01/2027 6,751 California--1.6% 750 California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds (Republic Services, Inc. Project), VRDN, AMT, 4% due 3/01/2028 (b) 750 3,650 Contra Costa County, California, M/F Housing Revenue Bonds (Pleasant Hill Bart Transit Station Project), VRDN, AMT Series A, 3.95% due 4/15/2046 (b) 3,651 Florida--8.8% 7,000 Florida Hurricane Catastrophe Fund Financing Corporation Revenue Bonds, Series A, 5% due 7/01/2010 7,201 2,020 Miami-Dade County, Florida, Educational Facilities Authority Revenue Bonds (University of Miami), Series A, 5.75% due 4/01/2010 (a)(c) 2,132 14,195 Orange County, Florida, Tourist Development, Tax Revenue Bonds, 5.50% due 10/01/2009 (a)(c) 14,695 Georgia--8.7% 5,600 Catoosa County, Georgia, School District, GO, 4.25% due 8/01/2008 (h) 5,630 6,005 Georgia Municipal Electric Authority, Power Revenue Refunding Bonds, Series DD, 7% due 1/01/2008 (h) 6,101 11,905 Georgia State, GO, Series B, 5% due 3/01/2008 12,007 Illinois--1.8% 5,000 Chicago, Illinois, S/F Mortgage Revenue Refunding Bonds, AMT, Series F, 3.83% due 4/18/2008 (i)(k) 4,997 Indiana--2.2% 4,750 Indiana Bond Bank Revenue Bonds (State Revolving Fund), Series B, 5.30% due 8/01/2010 (c) 4,978 1,000 Indiana State Development Finance Authority, IDR (Republic Services, Inc. Project), VRDN, AMT, 4.09% due 11/01/2035 (b) 1,000 Face Amount Municipal Bonds Value Kansas--0.7% $ 2,000 Junction City, Kansas, Temporary Notes, GO, Series D, 5% due 8/01/2007 $ 2,002 Louisiana--1.8% 2,900 Louisiana HFA, S/F Mortgage Revenue Bonds, VRDN, AMT, 4.53% due 11/28/2008 (b) 2,900 2,133 Louisiana HFA, S/F Mortgage Revenue Refunding Bonds, VRDN, AMT, 4.604% due 12/01/2047 (b) 2,134 Massachusetts--6.2% 8,415 Massachusetts Municipal Wholesale Electric Company, Power Supply System Revenue Refunding Bonds (Nuclear Project Number 4 Issue), Series A, 5% due 7/01/2008 (h) 8,516 8,505 Massachusetts State Consolidated Loan, GO, Series C, 5% due 5/01/2008 (f) 8,593 Michigan--1.7% 280 Michigan State Strategic Fund, Limited Obligation Revenue Bonds (Kay Screen Printing, Inc. Project), VRDN, AMT, 4.15% due 5/01/2020 (b) 280 4,120 Michigan State Trunk Line Fund, Revenue Refunding Bonds, Series B, 5% due 9/01/2010 (j) 4,254 Minnesota--3.7% 2,620 Minneapolis and Saint Paul, Minnesota, Metropolitan Airports Commission, Airport Revenue Bonds, AMT, Series B, 5.50% due 1/01/2010 (g) 2,702 7,385 Minnesota State, GO, Refunding, 5% due 8/01/2007 7,393 Nebraska--0.9% 2,500 Central Plains Energy Project, Nebraska, Revenue Bonds (Gas Project Number 1), VRDN, 3.908% due 12/01/2010 (b) 2,494 Nevada--5.2% 6,500 Clark County, Nevada, Airport System Subordinate Lien Revenue Bonds, AMT, Series B-1, 5% due 7/01/2008 6,570 7,500 Clark County, Nevada, EDR (Alexander Dawson School of Nevada Project), 5.50% due 5/15/2009 (c) 7,780 New Jersey--2.6% 2,000 Bayonne, New Jersey, GO, BAN, 4.75% due 10/26/2007 2,002 4,790 New Jersey Building Authority, State Building Revenue Refunding Bonds, Series B, 5.25% due 12/15/2010 (a) 5,002 New Mexico--2.1% 5,685 New Mexico State, Severance Tax Bonds, Series A, 5% due 7/01/2008 (h) 5,756 Portfolio Abbreviations To simplify the listings of BlackRock Municipal Bond Fund, Inc.'s portfolio holdings in the Schedules of Investments, we have abbreviated the names of many of the securities according to the list at right. AMT Alternative Minimum Tax (subject to) BAN Bond Anticipation Notes CARS Complementary Auction Rate Securities COP Certificates of Participation CP Commercial Paper DRIVERS Derivative Inverse Tax-Exempt Receipts EDA Economic Development Authority EDR Economic Development Revenue Bonds GO General Obligation Bonds HDA Housing Development Agency HFA Housing Finance Agency IDA Industrial Development Authority IDB Industrial Development Board IDR Industrial Development Revenue Bonds M/F Multi-Family PCR Pollution Control Revenue Bonds S/F Single-Family TRAN Tax Revenue Anticipation Notes VRDN Variable Rate Demand Notes BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (concluded) BlackRock Short-Term Municipal Fund (In Thousands) Face Amount Municipal Bonds Value Ohio--3.1% $ 4,400 Ohio State Building Authority, State Facilities Revenue Bonds (Administrative Building Fund Projects), Series A, 5.375% due 10/01/2008 (c) $ 4,527 3,875 Ohio State, Common Schools, GO, Series A, 5% due 3/15/2011 4,015 Oklahoma--0.2% 500 Oklahoma State Capitol Improvement Authority, State Facilities Revenue Bonds (Higher Education Projects), VRDN, Series D-4, 3.76% due 7/01/2034 (b)(f) 500 Pennsylvania--3.4% 4,000 Bethlehem, Pennsylvania, Area School District, GO, Refunding, Series A, 5% due 9/01/2010 (h) 4,130 5,000 Pennsylvania State, GO, Refunding, Third Series, 5% due 7/01/2009 5,114 South Carolina--3.3% 4,590 Aiken County, South Carolina, Consolidated School District, GO, Refunding, 5% due 3/01/2009 4,679 Hilton Head Island, South Carolina, Public Facility Corporation, COP (Beach Preservation Fee Pledge) (h): 2,161 5% due 8/01/2008 2,189 2,241 5% due 8/01/2009 2,292 Tennessee--5.7% 11,500 Metropolitan Government of Nashville and Davidson County, Tennessee, Health and Education Facilities Board, Revenue Refunding Bonds (Ascension Health Credit), VRDN, Series B-1, 3.72% due 11/15/2031 (b) 11,498 4,000 Tennessee Energy Acquisition Corporation, Gas Revenue Bonds, Series A, 5% due 9/01/2009 4,082 Texas--10.3% 3,980 Austin, Texas, Independent School District, GO, Refunding, 5.25% due 8/01/2009 4,091 7,000 Brazos River, Texas, Harbor Navigation District, Brazoria County Environmental Revenue Refunding Bonds (Dow Chemical Company Project), AMT, VRDN, Series A-4, 5.20% due 5/15/2033 (b) 7,047 5,000 Harris County, Texas, Toll Road Revenue Refunding Bonds, VRDN, Series B-2, 5% due 8/15/2021 (b)(g) 5,108 2,200 Montgomery County, Texas, Unlimited Tax Adjustable Rate Road, GO, VRDN, Series B, 5% due 3/01/2028 (b)(j) 2,229 Face Amount Municipal Bonds Value Texas (concluded) $ 2,790 North Texas Thruway Authority, Dallas North Thruway System, Revenue Refunding Bonds, VRDN, Series B, 5% due 1/01/2038 (a)(b) $ 2,821 2,500 San Antonio, Texas, Electric and Gas System, Junior Lien Revenue Bonds, VRDN, 3.55% due 12/01/2027 (b) 2,494 4,275 Tarrant County, Texas, Cultural Education Facilities Financing Corporation, Revenue Refunding Bonds (Texas Health Resources), Series A, 5% due 2/15/2011 4,401 Virginia--1.8% 4,885 Virginia State Public School Authority, School Financing Revenue Bonds, Series B, 5% due 8/01/2008 (c) 4,996 Washington--4.9% 9,940 Energy Northwest, Washington, Electric Revenue Refunding Bonds (Columbia Generating Station), Series A, 5.25% due 7/01/2009 (a) 10,210 2,900 Tacoma, Washington, Electric System Revenue Refunding Bonds, Series A, 5.625% due 1/01/2011 (j) 3,082 Wisconsin--5.0% 6,500 Madison, Wisconsin, Metropolitan School District, TRAN, 4% due 9/07/2007 6,501 7,070 Wisconsin Public Power Inc., Power Supply System, Revenue Refunding Bonds, Series A, 5.25% due 7/01/2010 (h) 7,334 Puerto Rico--2.2% 6,000 Puerto Rico Commonwealth, CP, 4.10% due 8/01/2007 6,000 Total Municipal Bonds (Cost--$263,932)--96.2% 263,416 Shares Held Short-Term Securities 6,603 Merrill Lynch Institutional Tax-Exempt Fund, 3.59% (d)(e) 6,603 Total Short-Term Securities (Cost--$6,603)--2.4% 6,603 Total Investments (Cost--$270,535*)--98.6% 270,019 Other Assets Less Liabilities--1.4% 3,700 ---------- Net Assets--100.0% $ 273,719 ========== * The cost and unrealized appreciation (depreciation) of investments as of June 30, 2007, as computed for federal income tax purposes, were as follows: Aggregate cost $ 270,535 =============== Gross unrealized appreciation $ 92 Gross unrealized depreciation (608) --------------- Net unrealized depreciation $ (516) =============== (a) AMBAC Insured. (b) Security may have a maturity of more than one year at time of issuance, but has variable rate and demand features that qualify it as a short-term security. The rate disclosed is that currently in effect. This rate changes periodically based upon prevailing market rates. (c) Prerefunded. (d) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: Net Dividend Affiliate Activity Income Merrill Lynch Institutional Tax-Exempt Fund (18,041) $314 (e) Represents the current yield as of June 30, 2007. (f) CIFG Insured. (g) FGIC Insured. (h) MBIA Insured. (i) FHLMC Collateralized. (j) FSA Insured. (k) FNMA/GNMA Collateralized. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments as of June 30, 2007 BlackRock Municipal Insured Fund (In Thousands) Face Amount Municipal Bonds Value Alabama--2.0% $10,000 Lauderdale County and Florence, Alabama, Health Care Authority Revenue Refunding Bonds (Coffee Health Group), Series A, 6% due 7/01/2029 (g) $ 10,692 7,000 University of Alabama, University Revenue Bonds (Birmingham), 6% due 10/01/2009 (c)(h) 7,320 Arkansas--0.5% 4,000 University of Arkansas, University Revenue Bonds (Various Facilities-Fayetteville Campus), 5% due 12/01/2027 (c) 4,116 California--16.6% 2,800 Arcadia, California, Unified School District, Capital Appreciation, GO (Election of 2006), Series A, 4.96% due 8/01/2039 (e)(l) 540 2,075 California State Department of Veteran Affairs, Home Purchase Revenue Refunding Bonds, Series A, 5.35% due 12/01/2027 (a) 2,173 2,000 Corona-Norco, California, Unified School District, GO (Election of 2006), Series A, 5% due 8/01/2031 (e) 2,082 Fresno, California, Unified School District, GO (Election of 2001): 5,170 Series D, 5% due 8/01/2027 (g) 5,361 1,500 Series E, 5% due 8/01/2030 (e) 1,558 Los Angeles, California, Unified School District, GO: 13,690 (Election of 1997), Series F, 5% due 7/01/2013 (c)(h) 14,474 10,000 (Election of 2002), Series B, 5% due 7/01/2022 (a) 10,531 8,965 Modesto, California, Schools Infrastructure Financing Agency, Special Tax Bonds, 5.50% due 9/01/2036 (a) 9,554 12,040 Mount Diablo, California, Unified School District, GO (Election of 2002), 5% due 7/01/2027 (c) 12,410 6,440 Palm Springs, California, Financing Authority, Lease Revenue Refunding Bonds (Convention Center Project), Series A, 5.50% due 11/01/2035 (g) 6,965 10,000 Ramona, California, Unified School District, Convertible Capital Appreciation Refunding Bonds, COP, 5.367% due 5/01/2012 (c)(l) 7,926 3,900 Redlands, California, Unified School District, GO (Election of 2002), 5% due 7/01/2025 (e) 4,035 11,685 Rialto, California, Unified School District, GO, Series A, 6.24% due 6/01/2025 (c)(l) 5,020 5,000 Roseville, California, Joint Union High School District, GO (Election of 2004), Series A, 5% due 8/01/2029 (c) 5,159 5,075 Sacramento, California, Unified School District, GO (Election of 1999), Series B, 5% due 7/01/2026 (c) 5,229 2,685 San Diego, California, Community College District, GO (Election of 2002), 5% due 5/01/2030 (e) 2,776 3,495 San Diego County, California, COP (Edgemoor Project and Regional System), Refunding, 5% due 2/01/2027 (a) 3,597 3,700 San Jose, California, GO (Libraries, Parks and Public Safety Projects), 5% due 9/01/2030 (g) 3,809 10,055 Sequoia, California, Unified High School District, GO, Refunding, Series B, 5.50% due 7/01/2035 (e) 10,964 950 Simi Valley, California, School Financing Authority, Revenue Refunding Bonds, 5% due 8/01/2027 (e) 996 2,755 Tahoe Truckee, California, Unified School District, GO (School Facilities Improvement District Number 2), Series A, 5.25% due 8/01/2029 (g) 2,885 Face Amount Municipal Bonds Value California (concluded) Tustin, California, Unified School District, Senior Lien Special Tax Bonds (Community Facilities District Number 97-1), Series A (e): $ 7,980 5% due 9/01/2032 $ 8,133 9,330 5% due 9/01/2038 9,499 10,000 Washington, California, Unified School District, COP (New High School Project), 5.125% due 8/01/2037 (a) 10,354 Colorado--2.8% 19,250 Aurora, Colorado, COP, 6% due 12/01/2010 (a)(h) 20,482 4,000 Logan County, Colorado, Justice Center Finance Corporation, COP, 5.50% due 12/01/2020 (g) 4,221 District of Columbia--1.3% 8,735 District of Columbia, Ballpark Revenue Bonds, Series B-1, 5% due 2/01/2031 (c) 8,999 2,800 District of Columbia, GO, Series A, 4.75% due 6/01/2036 (c) 2,782 Florida--1.3% 5,500 Dade County, Florida, Water and Sewer System Revenue Bonds, 5.25% due 10/01/2026 (c) 5,569 3,900 Miami-Dade County, Florida, Aviation Revenue Refunding Bonds (Miami International Airport), AMT, Series A, 5% due 10/01/2040 (k) 3,936 1,600 West Coast Regional Water Supply Authority, Florida, Capital Improvement Revenue Bonds, 10.40% due 10/01/2010 (a)(h) 1,700 Georgia--4.1% Georgia Municipal Electric Authority, Power Revenue Refunding Bonds (a): 20,000 Series EE, 7% due 1/01/2025 26,013 90 Series Y, 6.40% due 1/01/2011 (h) 97 490 Series Y, 6.40% due 1/01/2013 (b) 535 8,420 Series Y, 6.40% due 1/01/2013 9,187 Illinois--1.0% 8,505 Chicago, Illinois, O'Hare International Airport, Revenue Refunding Bonds, Third Lien, AMT, Series C-2, 5.25% due 1/01/2034 (k) 8,784 Kansas--0.6% 5,145 Manhattan, Kansas, Hospital Revenue Bonds (Mercy Health Center), 5.50% due 8/15/2020 (e) 5,400 Louisiana--1.5% 2,500 Louisiana State Citizens Property Insurance Corporation, Assessment Revenue Bonds, Series B, 5% due 6/01/2022 (a) 2,595 2,400 Louisiana State, Gas and Fuels Tax Revenue Bonds, Series A, 4.75% due 5/01/2039 (e) 2,380 5,000 New Orleans, Louisiana, GO (Public Improvements), 5.25% due 12/01/2029 (a) 5,244 2,800 Rapides Financing Authority, Louisiana, Revenue Bonds (Cleco Power LLC Project), AMT, 4.70% due 11/01/2036 (a) 2,691 Maryland--0.6% 4,400 Maryland State Health and Higher Educational Facilities Authority Revenue Bonds (University of Maryland Medical System), Series B, 7% due 7/01/2022 (c) 5,514 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (continued) BlackRock Municipal Insured Fund (In Thousands) Face Amount Municipal Bonds Value Massachusetts--7.2% $ 4,000 Massachusetts State, HFA, Rental Housing Mortgage Revenue Bonds, AMT, Series C, 5.60% due 1/01/2045 (e) $ 4,176 Massachusetts State HFA, S/F Housing Revenue Bonds, AMT, Series 128 (e): 2,845 4.80% due 12/01/2027 2,780 7,000 4.875% due 12/01/2038 6,786 Massachusetts State School Building Authority, Dedicated Sales Tax Revenue Bonds, Series A: 15,000 5% due 8/15/2030 (e) 15,536 9,950 4.75% due 8/15/2032 (a) 9,997 22,250 Massachusetts State Special Obligation Dedicated Tax Revenue Bonds, 5.25% due 1/01/2014 (c)(h) 23,738 Minnesota--1.7% 5,860 Delano, Minnesota, Independent School District Number 879, GO, Series A, 5.875% due 2/01/2025 (e) 6,210 Sauk Rapids, Minnesota, Independent School District Number 047, GO, Series A (g): 3,735 5.65% due 2/01/2020 3,930 4,440 5.70% due 2/01/2021 4,679 Mississippi--1.4% 1,320 Harrison County, Mississippi, Wastewater Management District, Revenue Refunding Bonds (Wastewater Treatment Facilities), Series A, 8.50% due 2/01/2013 (b)(c) 1,607 10,000 Mississippi Hospital Equipment and Facilities Authority Revenue Bonds (Forrest County General Hospital Project), 6% due 1/01/2030 (e) 10,735 Missouri--4.5% Kansas City, Missouri, Airport Revenue Refunding and Improvement Bonds, Series A (g): 12,990 5.50% due 9/01/2013 13,219 9,000 5.50% due 9/01/2014 9,159 Missouri Joint Municipal Electric Utility Commission, Power Project Revenue Bonds (Latan 2 Project), Series A (a): 7,930 5% due 1/01/2027 8,213 8,325 5% due 1/01/2028 8,622 Nevada--1.2% 1,300 Clark County, Nevada, IDR (Southwest Gas Corp. Project), AMT, Series A, 4.75% due 9/01/2036 (c) 1,250 9,250 Clark County, Nevada, Passenger Facility Charge Revenue Bonds (Las Vegas McCarran International), Series A-2, 5% due 7/01/2026 (a) 9,589 New Jersey--8.2% 6,810 Cape May County, New Jersey, Industrial Pollution Control Financing Authority, Revenue Refunding Bonds (Atlantic City Electric Company Project), Series A, 6.80% due 3/01/2021 (g) 8,490 Garden State Preservation Trust of New Jersey, Open Space and Farmland Preservation Revenue Bonds, Series A (e): 3,125 5.80% due 11/01/2021 3,490 8,310 5.80% due 11/01/2022 9,280 4,340 5.80% due 11/01/2023 4,847 Face Amount Municipal Bonds Value New Jersey (concluded) New Jersey EDA, Motor Vehicle Surcharge Revenue Bonds, Series A (g): $ 5,000 5% due 7/01/2027 $ 5,164 23,000 5.25% due 7/01/2033 24,224 New Jersey State Transportation Trust Fund Authority, Transportation System Revenue Bonds, Series D: 4,240 5% due 6/15/2018 (a) 4,451 11,530 5% due 6/15/2019 (e) 12,065 New Mexico--1.2% 10,400 New Mexico Finance Authority, Senior Lien State Transportation Revenue Bonds, Series A, 5.125% due 6/15/2018 (g) 10,982 New York--12.6% 2,200 Metropolitan Transportation Authority, New York, Transportation Revenue Bonds, Series A, 4.75% due 11/15/2037 (c) 2,202 New York City, New York, GO: 11,495 Series C, 5.625% due 3/15/2012 (h)(k) 12,325 5 Series C, 5.625% due 3/15/2018 (k) 5 10,000 Series E, 5% due 11/01/2017 (e) 10,553 6,155 Series I, 6% due 4/15/2012 (e) 6,227 3 New York City, New York, Sales Tax Asset Receivable Corporation Revenue Bonds, DRIVERS, Series 1133Z, 6.45% due 10/15/2012 (a)(j) 3 New York City, New York, Sales Tax Asset Receivable Corporation Revenue Bonds, Series A: 16,905 5% due 10/15/2020 (g) 17,692 15,650 5% due 10/15/2032 (a) 16,210 11,795 New York State Dormitory Authority Revenue Bonds (School Districts Financing Program), Series D, 5.25% due 10/01/2023 (g) 12,418 9,110 New York State Urban Development Corporation, Personal Income Tax Revenue Bonds (State Facilities), Series A-1, 5.25% due 3/15/2034 (c) 9,570 5 Niagara Falls, New York, GO, Public Improvement, 6.90% due 3/01/2024 (g) 5 22,500 Tobacco Settlement Financing Corporation of New York Revenue Bonds, Series A-1, 5.25% due 6/01/2022 (a) 23,618 North Carolina--0.3% 3,030 North Carolina HFA, Home Ownership Revenue Bonds, AMT, Series 14-A, 5.35% due 1/01/2022 (a) 3,073 North Dakota--0.3% 2,630 North Dakota State HFA, Revenue Bonds (Housing Finance Program), Series C, 5.30% due 7/01/2022 (a) 2,659 Oklahoma--0.8% Oklahoma State Industries Authority, Health System Revenue Refunding Bonds (Integris Obligated Group), Series A (g): 2,680 6.25% due 8/15/2009 (h) 2,833 3,705 6.25% due 8/15/2016 3,904 Oregon--1.6% 8,700 Oregon State Department, Administrative Services, COP, Series A, 6.25% due 5/01/2010 (a)(h) 9,315 3,865 Port of Portland, Oregon, Airport Revenue Refunding Bonds (Portland International Airport), AMT, Series 7-B, 7.10% due 1/01/2012 (g)(h) 4,310 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (continued) BlackRock Municipal Insured Fund (In Thousands) Face Amount Municipal Bonds Value Pennsylvania--2.7% $ 5,510 Philadelphia, Pennsylvania, Gas Works Revenue Bonds, 12th Series B, 7% due 5/15/2020 (b)(g) $ 6,444 4,420 Philadelphia, Pennsylvania, Redevelopment Authority Revenue Bonds (Neighborhood Transformation), Series A, 5.50% due 4/15/2020 (c) 4,675 12,010 Pittsburgh, Pennsylvania, GO, Series C, 5.25% due 9/01/2018 (e) 12,898 Rhode Island--0.8% 6,815 Rhode Island State Economic Development Corporation, Airport Revenue Bonds, Series B, 6% due 7/01/2010 (c)(h) 7,270 South Carolina--0.6% 5,000 Scago Educational Facilities Corporation for Pickens County School District, South Carolina, Revenue Bonds, 5% due 12/01/2031 (e) 5,155 Texas--1.6% 3,500 Houston, Texas, Water Conveyance System Contract, COP, Series J, 6.25% due 12/15/2013 (a) 3,907 8,110 Lewisville, Texas, Independent School District, Capital Appreciation and School Building, GO, Refunding, 4.67% due 8/15/2024 (c)(l) 3,471 1,500 North Texas Thruway Authority, Dallas North Thruway System Revenue Bonds, Series A, 5% due 1/01/2035 (e) 1,536 Texas State Department of Housing and Community Affairs, S/F Mortgage Revenue Bonds, AMT, Series A (d)(g): 2,085 5.45% due 9/01/2023 2,120 2,725 5.50% due 3/01/2026 2,775 Utah--1.9% 9,535 Utah Transit Authority, Sales Tax and Transportation Revenue Bonds (Salt Lake County Light Rail Transit Project), 5.375% due 12/15/2007 (e)(h) 9,698 Utah Water Finance Agency Revenue Bonds (Pooled Loan Financing Program), Series A (a): 2,515 5.75% due 10/01/2015 2,650 3,770 6% due 10/01/2020 3,993 Washington--0.9% 7,225 Chelan County, Washington, Public Utility District Number 001, Consolidated Revenue Bonds (Chelan Hydro System), AMT, Series A, 5.45% due 7/01/2037 (a) 7,484 West Virginia--1.4% 12,250 Pleasants County, West Virginia, PCR, Refunding (Potomac-Pleasants), Series C, 6.15% due 5/01/2015 (a) 12,594 Wisconsin--1.4% 9,000 Superior, Wisconsin, Limited Obligation Revenue Refunding Bonds (Midwest Energy Resources), Series E, 6.90% due 8/01/2021 (c) 11,283 670 Wisconsin State, GO, AMT, Series B, 6.50% due 5/01/2025 (g) 671 Total Municipal Bonds (Cost--$713,404)--84.6% 743,052 Face Amount Municipal Bonds Held in Trust (m) Value California--2.2% $11,360 California Pollution Control Financing Authority, PCR, Refunding (Pacific Gas and Electric), AMT, Series A, 5.35% due 12/01/2016 (g) $ 11,962 7,500 San Jose, California, Financing Authority, Lease Revenue Refunding Bonds (Civic Center Project), Series B, 5% due 6/01/2032 (a) 7,633 Florida--3.4% Miami-Dade County, Florida, Aviation Revenue Refunding Bonds (Miami International Airport), AMT, Series A: 15,000 5% due 10/01/2039 (g) 15,173 14,600 5% due 10/01/2040 (k) 14,734 Illinois--2.2% 17,690 Chicago, Illinois, O'Hare International Airport Revenue Bonds, Third Lien, AMT, Series B-2, 6% due 1/01/2027 (g)(k) 19,444 Maryland--2.6% 21,640 Baltimore, Maryland, Convention Center Hotel Revenue Bonds, Senior Series A, 5.25% due 9/01/2039 (k) 22,797 Michigan--1.6% 13,145 Michigan State Strategic Fund, Limited Obligation Revenue Refunding Bonds (Detroit Edison Company Pollution Control Project), AMT, Series A, 5.50% due 6/01/2030 (k) 13,878 Nebraska--1.3% 11,300 Public Power Generation Agency, Nebraska Revenue Bonds (Whelan Energy Center Unit 2-A), 5% due 1/01/2025 (a) 11,751 New Jersey--1.6% 13,500 New Jersey State Turnpike Authority, Turnpike Revenue Bonds, Series C, 5% due 1/01/2030 (e) 13,969 New York--1.7% 13,925 New York City, New York, Sales Tax Asset Receivable Corporation Revenue Bonds, Series A, 5.25% due 10/15/2027 (a) 14,799 Texas--8.4% 21,230 Dallas-Fort Worth, Texas, International Airport Joint Revenue Refunding and Improvement Bonds, AMT, Series A, 5% due 11/01/2025 (g) 21,373 35,950 Dallas-Fort Worth, Texas, International Airport Revenue Bonds, AMT, Series A, 6% due 11/01/2028 (c) 37,310 14,050 Harris County, Texas, Toll Road Revenue Refunding Bonds, Senior Lien, Series A, 5.25% due 8/15/2035 (e) 14,582 Total Municipal Bonds Held in Trust (Cost--$220,949)--25.0% 219,405 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (concluded) BlackRock Municipal Insured Fund (In Thousands) Shares Held Mutual Funds (f) Value 300 BlackRock California Insured Municipal 2008 Term Trust, Inc. $ 4,524 810 BlackRock Insured Municipal 2008 Term Trust, Inc. 12,312 205 BlackRock Insured Municipal Term Trust, Inc. 1,995 Total Mutual Funds (Cost--$21,126)--2.1% 18,831 Shares Held Short-Term Securities Value 3,237 Merrill Lynch Institutional Tax-Exempt Fund, 3.59% (f)(i) $ 3,237 Total Short-Term Securities (Cost--$3,237)--0.4% 3,237 Total Investments (Cost--$958,716*)--112.1% 984,525 Other Assets Less Liabilities--0.5% 4,443 Liability for Trust Certificates, Including Interest Expense Payable--(12.6%) (110,515) ---------- Net Assets--100.0% $ 878,453 ========== * The cost and unrealized appreciation (depreciation) of investments as of June 30, 2007, as computed for federal income tax purposes, were as follows: Aggregate cost $ 849,019 =============== Gross unrealized appreciation $ 30,800 Gross unrealized depreciation (5,070) --------------- Net unrealized appreciation $ 25,730 =============== (a) AMBAC Insured. (b) Escrowed to maturity. (c) FGIC Insured. (d) FNMA/GNMA Collateralized. (e) FSA Insured. (f) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: Purchase Sales Realized Dividend Affiliate Cost Cost Gain Income BlackRock California Insured Municipal 2008 Term Trust, Inc. -- -- -- $222 BlackRock Insured Municipal 2008 Term Trust, Inc. -- -- -- $627 BlackRock Insured Municipal Term Trust, Inc. -- -- -- $ 74 Merrill Lynch Institutional Tax-Exempt Fund $1,507* -- -- $302 * Represents net purchase cost. (g) MBIA Insured. (h) Prerefunded. (i) Represents the current yield as of June 30, 2007. (j) The rate disclosed is that currently in effect. This rate changes periodically and inversely based upon prevailing market rates. (k) XL Capital Insured. (l) Represents a zero coupon bond; the interest rate shown reflects the effective yield at the time of purchase. (m) Securities represent underlying bonds transferred to a separate securitization trust established in a tender option bond transaction in which the Fund may have acquired the residual interest certificates. These securities serve as collateral in a financing transaction. See Note 1(c) to Financial Statements for details of municipal bonds held in trust. o Forward interest rate swaps outstanding as of June 30, 2007 were as follows: Notional Unrealized Amount Appreciation Pay a fixed rate of 3.834% and receive a floating rate based on 1-week Bond Market Association Rate Broker, JPMorgan Chase Expires August 2017 $25,000 $290 See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments as of June 30, 2007 BlackRock National Municipal Fund (In Thousands) Face Amount Municipal Bonds Value Alabama--0.9% $ 3,820 Alabama Incentives Financing Authority, Special Obligation Revenue Refunding Bonds, Series A, 6% due 10/01/2029 (c) $ 4,050 3,525 Jefferson County, Alabama, Public Building Authority, Lease Revenue Bonds, 5.125% due 4/01/2021 (c) 3,712 500 Mobile, Alabama, Industrial Development Board, Environmental Improvement Revenue Refunding Bonds (International Paper Company Project), AMT, Series A, 6.35% due 5/15/2016 524 2,500 Selma, Alabama, IDB, Environmental Improvement Revenue Refunding Bonds (International Paper Company Project), AMT, Series A, 6.70% due 2/01/2018 2,646 3,400 Tuscaloosa, Alabama, Special Care Facilities Financing Authority, Residential Care Facility Revenue Bonds (Capstone Village, Inc. Project), Series A, 5.875% due 8/01/2036 3,430 Alaska--0.3% 3,860 Anchorage, Alaska, School, GO, Series B, 5.875% due 12/01/2010 (e)(j) 4,097 Arizona--3.2% 4,000 Arizona Health Facilities Authority Revenue Bonds (Catholic Healthcare West), Series A, 6.625% due 7/01/2010 (j) 4,328 270 Maricopa County, Arizona, Hospital Revenue Refunding Bonds (Sun Health Corporation), 6.125% due 4/01/2018 276 3,100 Maricopa County, Arizona, IDA, Education Revenue Bonds (Arizona Charter Schools Project 1), Series A, 6.75% due 7/01/2029 3,139 1,625 Maricopa County, Arizona, IDA, Health Facilities Revenue Refunding Bonds (Catholic Healthcare West Project), Series A, 5% due 7/01/2021 1,632 1,000 Maricopa County, Arizona, Pollution Control Corporation, PCR, Refunding (Public Service Company of New Mexico Project), Series A, 6.30% due 12/01/2026 1,023 Peoria, Arizona, Improvement District Number 8801, Special Assessment Bonds: 190 7.30% due 1/01/2009 195 395 7.30% due 1/01/2011 405 Peoria, Arizona, Improvement District Number 8802, Special Assessment Bonds: 430 7.20% due 1/01/2010 440 510 7.20% due 1/01/2013 522 4,999 Phoenix and Pima County, Arizona, IDA, S/F Mortgage Revenue Bonds, AMT, Series 3-A, 5.25% due 8/01/2038 (i)(l) 5,099 7,500 Phoenix and Pima County, Arizona, IDA, S/F Mortgage Revenue Refunding Bonds, AMT, Series 2007-1, 5.25% due 8/01/2038 (i)(l) 7,657 2,330 Phoenix, Arizona, Civic Improvement Corporation, Municipal Facilities, Excise Tax Revenue Bonds, 5.75% due 7/01/2010 (e)(j) 2,467 3,685 Phoenix, Arizona, IDA, Airport Facility, Revenue Refunding Bonds (America West Airlines Inc. Project), AMT, 6.30% due 4/01/2023 3,734 500 Pinal County, Arizona, IDA, Wastewater Revenue Bonds (San Manuel Facilities Project), AMT, 6.25% due 6/01/2026 544 Face Amount Municipal Bonds Value Arizona (concluded) $ 391 Prescott Valley, Arizona, Improvement District, Special Assessment Bonds (Sewer Collection System Roadway Repair), 7.90% due 1/01/2012 $ 405 6,000 Salt River Project, Arizona, Agriculture Improvement and Power District, Electric System Revenue Refunding Bonds, Series A, 5.125% due 1/01/2023 6,231 3,515 Tucson, Arizona, IDA, Senior Living Facilities Revenue Bonds (Christian Care Tucson Inc. Project), Series A, 6.125% due 7/01/2010 (j)(m) 3,759 1,000 University of Arizona, COP (University of Arizona Parking and Student Housing), 5.75% due 6/01/2009 (c)(j) 1,035 University of Arizona, COP (University of Arizona Projects), Refunding, Series A (c): 2,915 5.50% due 6/01/2012 (j) 3,108 265 5.50% due 6/01/2018 281 Vistancia Community Facilities District, Arizona, GO: 3,000 6.75% due 7/15/2022 3,285 2,125 5.75% due 7/15/2024 2,267 Arkansas--0.1% 20 Arkansas State Development Finance Authority, S/F Mortgage Revenue Bonds (Mortgage- Backed Securities Program), Series H, 6.15% due 7/01/2016 (i) 20 250 Arkansas State Student Loan Authority Revenue Bonds, AMT, Sub-Series B, 7.25% due 6/01/2009 256 200 Jonesboro, Arkansas, Residential Housing and Health Care Facilities Board, Hospital Revenue Refunding Bonds (Saint Bernards Regional Medical Center), Series B, 5.90% due 7/01/2016 (c) 202 250 North Little Rock, Arkansas, Health Facilities Board, Health Care Revenue Bonds (Baptist Health), 5.50% due 7/01/2016 256 500 Pine Bluff, Arkansas, Environmental Improvement Revenue Refunding Bonds (International Paper Company Project), AMT, Series A, 6.70% due 8/01/2020 528 250 University of Central Arkansas, Housing System Revenue Bonds, 6.50% due 1/01/2010 (h)(j) 270 California--15.8% 2,500 Agua Caliente Band of Cahuilla Indians, California, Casino Revenue Bonds, 6% due 7/01/2018 2,653 12,000 Antelope Valley, California, Health Care District Revenue Bonds, Series A, 5.25% due 9/01/2017 12,243 Bay Area Toll Authority, California, Toll Bridge Revenue Refunding Bonds (San Francisco Bay Area), Series F: 14,500 5% due 4/01/2026 15,061 33,000 5% due 4/01/2031 34,164 5,000 California Pollution Control Financing Authority, Solid Waste Disposal Revenue Refunding Bonds (Waste Management Inc. Project), AMT, Series A, 5% due 1/01/2022 5,004 15 California Rural Home Mortgage Finance Authority, S/F Mortgage Revenue Bonds (Mortgage-Backed Securities Program), AMT, Series D, Class 5, 6.70% due 5/01/2029 (i)(l) 15 70 California Rural Home Mortgage Finance Authority, S/F Mortgage Revenue Refunding Bonds (Mortgage- Backed Securities Program), AMT, Series A-2, 7% due 9/01/2029 (i)(l) 71 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (continued) BlackRock National Municipal Fund (In Thousands) Face Amount Municipal Bonds Value California (continued) $ 5 California State, GO, 5.25% due 4/01/2029 $ 5 California State, GO, Refunding: 15 5.75% due 5/01/2010 (j) 16 115 5.75% due 5/01/2030 122 18,330 5% due 6/01/2032 18,770 3,600 5% due 6/01/2037 3,676 California State, Various Purpose, GO: 10,000 5.25% due 11/01/2027 10,471 14,100 5.50% due 11/01/2033 15,037 9,880 California Statewide Communities Development Authority, Health Facility Revenue Bonds (Memorial Health Services), Series A, 6% due 10/01/2023 10,587 Chula Vista, California, Community Facilities District Number 06-1, Special Tax Bonds (Eastlake Woods Area), Series A: 1,080 6.05% due 9/01/2020 1,143 2,965 6.15% due 9/01/2026 3,136 10,000 Chula Vista, California, IDR, Refunding (San Diego Gas & Electric Co.), AMT, Series C, 5.25% due 12/01/2027 10,372 Contra Costa County, California, Special Tax Bonds (Community Facilities District Number 2001-01): 1,585 6% due 9/01/2026 1,668 1,200 6.10% due 9/01/2031 1,265 8,340 East Bay, California, Municipal Utility District, Water System Revenue Refunding Bonds, Series A, 5% due 6/01/2037 (e) 8,657 3,100 Elk Grove, California, Poppy Ridge Community Facilities Number 3 Special Tax, Series 1, 6% due 9/01/2008 (j) 3,199 10,000 Fremont, California, Unified School District, Alameda County, GO (Election of 2002), Series B, 5% due 8/01/2028 (h) 10,363 12,730 Los Angeles County, California, Metropolitan Transportation Authority, Sales Tax Revenue Refunding Bonds, Proposition A, First Tier Senior-Series A, 5% due 7/01/2035 (c) 13,163 22,255 Metropolitan Water District of Southern California, Waterworks Revenue Bonds, Series A, 5% due 7/01/2037 23,107 1,100 Poway, California, Unified School District, Special Tax Bonds (Community District No. 6), Series A, 6.05% due 9/01/2025 1,139 2,695 Riverside, California, Improvement Bond Act of 1915, Special Assessment (Riverwalk Assessment District), 6.375% due 9/02/2026 2,868 Roseville, California, Special Tax Bonds: 3,915 (Fiddyment Ranch Community Facilities Number 1), 5.125% due 9/01/2026 3,916 1,125 (Stoneridge Community Facilities Number 1), 6% due 9/01/2011 (j) 1,225 1,250 (Stoneridge Community Facilities Number 1), 6.20% due 9/01/2011 (j) 1,370 2,500 (Stoneridge Community Facilities Number 1), 6.30% due 9/01/2011 (j) 2,750 Sacramento, California, Special Tax (North Natomas Community Facilities): 2,200 Series 01-03, 6% due 9/01/2028 2,297 2,270 Series 4-C, 6% due 9/01/2028 2,395 Face Amount Municipal Bonds Value California (concluded) $10,000 San Diego, California, Public Facilities Financing Authority, Subordinated Water Revenue Refunding Bonds, 5% due 8/01/2032 (f) $ 10,190 5,865 San Francisco, California, Bay Area Rapid Transit District, Sales Tax Revenue Refunding Bonds, Series A, 4.25% due 7/01/2036 (h) 5,351 San Francisco, California, City and County Redevelopment Agency Revenue Bonds (Community Facilities District Number 6--Mission): 5,000 6% due 8/01/2021 5,230 2,500 Series A, 6% due 8/01/2025 2,610 1,075 San Francisco, California, Uptown Parking Corporation, Parking Revenue Bonds (Union Square), 6% due 7/01/2020 (f) 1,167 Santa Margarita, California, Water District, Special Tax Refunding Bonds (Community Facilities District No. 99), Series 1: 2,970 6.25% due 9/01/2009 (j) 3,176 3,680 6.20% due 9/01/2020 3,932 Colorado--2.2% 500 Boulder County, Colorado, Hospital Development Revenue Bonds (Longmont United Hospital Project), 6% due 12/01/2010 (j)(m) 532 325 Colorado HFA, Revenue Bonds (S/F Program), Series B-3, 6.55% due 10/01/2016 332 4,000 Colorado HFA, Revenue Refunding Bonds (Adventist Health System/Sunbelt Obligor Group), Series D, 5.25% due 11/15/2035 4,095 Colorado HFA, Revenue Refunding Bonds (S/F Program), AMT: 265 Senior Series A-2, 7.50% due 4/01/2031 266 95 Senior Series A-3, 7.35% due 10/01/2030 96 115 Senior Series B-2, 7.10% due 4/01/2017 118 825 Senior Series B-2, 7.25% due 10/01/2031 874 35 Senior Series B-3, 6.80% due 11/01/2028 36 310 Senior Series C-2, 7.25% due 10/01/2031 (b) 317 495 Senior Series C-3, 6.75% due 10/01/2021 (b) 529 125 Senior Series C-3, 7.15% due 10/01/2030 (b) 127 Colorado Health Facilities Authority Revenue Refunding Bonds: 2,500 (Catholic Health Initiatives), 5.50% due 9/01/2011 (j) 2,639 1,000 (Christian Living Communities Project), Series A, 5.75% due 1/01/2037 1,037 Colorado Water Resource and Power Development Authority, Small Water Resources Revenue Bonds, Series A (e): 350 5.80% due 11/01/2010 (j) 370 200 5.80% due 11/01/2020 211 Elk Valley, Colorado, Public Improvement Revenue Bonds (Public Improvement Fee): 7,560 Series A, 7.35% due 9/01/2031 7,952 1,100 Series B, 7.45% due 9/01/2031 1,160 3,685 Larimer County, Colorado, Poudre School District Number R-1, GO, 6% due 12/15/2010 (e)(j) 3,928 Plaza Metropolitan District Number 1, Colorado, Tax Allocation Revenue Bonds (Public Improvement Fees): 7,700 8% due 12/01/2025 8,461 1,910 8.125% due 12/01/2025 1,919 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (continued) BlackRock National Municipal Fund (In Thousands) Face Amount Municipal Bonds Value Connecticut--1.1% $ 1,000 Connecticut State Development Authority, Governmental Lease Revenue Bonds, 6.60% due 6/15/2014 (f) $ 1,002 1,250 Connecticut State Development Authority, Water Facility Revenue Bonds (Bridgeport Hydraulic Company), AMT, 6.15% due 4/01/2035 (c) 1,277 960 Connecticut State HFA, Revenue Refunding Bonds (Housing Mortgage Finance Program), Series C-1, 6.30% due 11/15/2017 981 Connecticut State Health and Educational Facilities Authority, Revenue Bonds: 1,000 (Bridgeport Hospital), Series A, 6.625% due 7/01/2018 (f) 1,004 1,500 (Waterbury Hospital Issue), Series C, 5.75% due 7/01/2020 (m) 1,555 1,000 (Westover School), Series A, 5.70% due 7/01/2030 (m) 1,046 Connecticut State Health and Educational Facilities Authority, Revenue Refunding Bonds (m): 3 DRIVERS, Series 215, 8.94% due 6/01/2030 (n) 3 2,000 (Eastern Connecticut Health Network), Series A, 6.50% due 7/01/2010 (j) 2,161 640 (Sacred Heart University), 6.625% due 7/01/2026 648 5,710 (University of Hartford), Series E, 5.50% due 7/01/2022 6,056 545 Connecticut State Higher Education Supplemental Loan Authority, Revenue Bonds (Family Education Loan Program), AMT, Series A, 5.50% due 11/15/2020 (f) 547 860 Waterbury, Connecticut, GO, 6% due 2/01/2009 (j)(m) 897 Delaware--0.1% 1,685 New Castle County, Delaware, PCR (General Motors Corporation Project), VRDN, 7% due 10/01/2008 (g) 1,685 Florida--8.6% 1,975 Anthem Park Community Development District, Florida, Capital Improvement Revenue Bonds, 5.80% due 5/01/2036 2,006 2,000 Ave Maria Stewardship Community District, Florida, Capital Improvement Revenue Bonds, Series A, 5.125% due 5/01/2038 1,869 1,500 Ave Maria Stewardship Community District, Florida, Revenue Bonds, 4.80% due 11/01/2012 1,496 1,645 Ballantrae, Florida, Community Development District, Capital Improvement Revenue Bonds, 6% due 5/01/2035 1,722 4,900 Bartram Springs Community Development District, Florida, Special Assessment Refunding Bonds, 4.75% due 5/01/2034 4,490 1,755 Beacon Tradeport Community, Florida, Development District, Special Assessment Revenue Refunding Bonds (Commercial Project), Series A, 5.25% due 5/01/2016 (m) 1,845 4,000 Broward County, Florida, Airport System Revenue Refunding Bonds, AMT, Series E, 5.25% due 10/01/2012 (f) 4,093 2,500 CFM Community Development District, Florida, Capital Improvement Revenue Bonds, Series B, 5.875% due 5/01/2014 2,577 2,725 Duval County, Florida, School Board, COP, 5.75% due 7/01/2017 (h) 2,818 Face Amount Municipal Bonds Value Florida (continued) Fiddlers Creek, Florida, Community Development District Number 2, Special Assessment Revenue Bonds: $ 5,350 Series A, 6.375% due 5/01/2035 $ 5,635 1,020 Series B, 5.75% due 5/01/2013 1,044 7,000 Halifax Hospital Medical Center, Florida, Hospital Revenue Refunding and Improvement Bonds, Series A, 5.25% due 6/01/2026 7,135 1,135 Highland Meadows Community Development District, Florida, Special Assessment Bonds, Series A, 5.50% due 5/01/2036 1,133 21,000 Highlands County, Florida, Health Facilities Authority, Hospital Revenue Refunding Bonds (Adventist Health System), Series G, 5.125% due 11/15/2032 21,256 5,000 Hillsborough County, Florida, IDA, Exempt Facilities Revenue Bonds (National Gypsum Company), AMT, Series A, 7.125% due 4/01/2030 5,380 10,000 Hillsborough County, Florida, IDA, Hospital Revenue Bonds (Tampa General Hospital Project), 5.25% due 10/01/2041 10,190 2,000 Lee County, Florida, IDA, Health Care Facilities, Revenue Refunding Bonds (Shell Point/Alliance Obligor Group), 5% due 11/15/2029 1,960 1,140 Lexington Oaks, Florida, Community Development District, Special Assessment Revenue Bonds, Series A, 6.70% due 5/01/2033 1,226 950 Mediterra, Florida, South Community Development District, Capital Improvement Revenue Bonds, 6.85% due 5/01/2031 1,017 2,500 Middle Village Community Development District, Florida, Special Assessment Bonds, Series A, 6% due 5/01/2035 2,585 6,625 Midtown Miami, Florida, Community Development District, Special Assessment Revenue Bonds, Series A, 6.25% due 5/01/2037 7,048 1,000 New River Community Development District, Florida, Capital Improvement Revenue Bonds, Series B, 5% due 5/01/2013 986 1,625 Old Palm Community Development District, Florida, Special Assessment Bonds (Palm Beach Gardens), Series B, 5.375% due 5/01/2014 1,627 3,500 Orange County, Florida, HFA, M/F Housing Revenue Bonds (Loma Vista Project), Series G, 5.50% due 3/01/2032 3,544 Orange County, Florida, Health Facilities Authority, Hospital Revenue Bonds (Orlando Regional Healthcare): 1,000 5.70% due 7/01/2026 1,013 2,200 Series B, 5.125% due 11/15/2039 2,212 10,000 Orlando, Florida, Greater Orlando Aviation Authority, Airport Facilities Revenue Bonds, AMT, Series A, 5.25% due 10/01/2018 (e) 10,267 Panther Trace Community Development District II, Florida, Special Assessment Revenue Bonds: 5,000 5.125% due 11/01/2013 4,929 5,000 Series A, 5.60% due 5/01/2035 5,014 Park Place Community Development District, Florida, Special Assessment Revenue Bonds: 2,300 6.75% due 5/01/2032 2,441 960 6.375% due 5/01/2034 1,018 2,000 Saint Lucie, Florida, West Services District, Utility Revenue Refunding Bonds, Senior Lien, 6% due 10/01/2022 (f) 2,153 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (continued) BlackRock National Municipal Fund (In Thousands) Face Amount Municipal Bonds Value Florida (concluded) Sarosota County, Florida, Health Facilities Authority, Retirement Facility Revenue Refunding Bonds (Village on the Isle Project): $ 780 5.50% due 1/01/2027 $ 795 1,645 5.50% due 1/01/2032 1,669 2,875 Somerset Community Development District, Florida, Capital Improvement Revenue Bonds, 5% due 5/01/2015 2,809 305 Sterling Hill, Florida, Community Development District, Capital Improvement Revenue Refunding Bonds, Series B, 5.50% due 11/01/2010 305 180 Stoneybrook West, Florida, Community Development District, Special Assessment Revenue Bonds, Series B, 6.45% due 5/01/2010 181 1,190 Tern Bay Community Development District, Florida, Capital Improvement Revenue Refunding Bonds, Series B, 5% due 5/01/2015 1,165 2,185 Tuscany Reserve Community Development District, Florida, Capital Improvement Revenue Bonds, Series B, 5.25% due 5/01/2016 2,164 3,520 University of South Florida Financing Corporation, COP (Master Lease Program), Refunding, Series A, 5.375% due 7/01/2022 (c) 3,749 1,650 Watergrass Community Development District, Florida, Special Assessment Revenue Bonds, Series B, 4.875% due 11/01/2010 1,631 Georgia--1.8% 5,000 Atlanta, Georgia, Tax Allocation Bonds (Atlantic Station Project), 7.90% due 12/01/2024 5,481 Brunswick and Glynn County, Georgia, Development Authority, First Mortgage Revenue Bonds (Coastal Community Retirement Corporation Project), Series A (p): 2,285 7.125% due 1/01/2025 1,820 4,555 7.25% due 1/01/2035 3,620 5,210 College Park, Georgia, Business and IDA Revenue Bonds (Civic Center Project), 5.75% due 9/01/2010 (c)(j) 5,576 1,940 Fulton County, Georgia, Development Authority, PCR (General Motors Corporation), Refunding, VRDN, 7.50% due 4/01/2010 (g) 1,940 3,450 Fulton County, Georgia, Development Authority Revenue Bonds (Morehouse College Project), 5.875% due 12/01/2010 (c)(j) 3,678 2,250 Fulton County, Georgia, Residential Care Facilities, Revenue Refunding Bonds (Canterbury Court Project), Series A, 6% due 2/15/2022 2,275 Gainesville, Georgia, Redevelopment Authority, Educational Facilities Revenue Refunding Bonds (RiversideMilitary Academy): 1,350 5.125% due 3/01/2027 1,365 1,800 5.125% due 3/01/2037 1,811 1,500 Milledgeville-Baldwin County, Georgia, Development Authority Revenue Bonds (Georgia College and State University Foundation), 6% due 9/01/2014 (j) 1,683 Illinois--7.0% 1,000 Bolingbrook, Illinois, Special Services Area Number 1, Special Tax Bonds (Forest City Project), 5.90% due 9/01/2007 (p) 1,019 2 Chicago, Illinois, Board of Education, GO, DRIVERS, Series 199, 7.412% due 12/01/2020 (c)(n) 2 Face Amount Municipal Bonds Value Illinois (concluded) $26,800 Chicago, Illinois, O'Hare International Airport Revenue Bonds, Third Lien, AMT, Series B-2, 6% due 1/01/2029 (k) $ 29,457 6,915 Chicago, Illinois, O'Hare International Airport, Special Facility Revenue Refunding Bonds (American Airlines Inc. Project), 8.20% due 12/01/2024 6,937 350 Chicago, Illinois, Park District, GO, Refunding, Series B, 5.75% due 1/01/2015 (e) 370 230 Chicago, Illinois, Park District, Limited Tax, GO, Series A, 5.75% due 1/01/2016 (e) 243 325 Chicago, Illinois, S/F Mortgage Revenue Bonds, AMT, Series A, 7.15% due 9/01/2031 (i)(l) 333 2,000 Chicago, Illinois, Special Assessment Bonds (Lake Shore East), 6.75% due 12/01/2032 2,147 3,210 Cicero, Illinois, GO, Refunding (Corporate Purpose), 6% due 12/01/2028 (f) 3,407 7,000 Decatur, Illinois, GO, Refunding, 6% due 3/01/2008 (e)(j) 7,104 10,000 Hodgkins, Illinois, Environmental Improvement Revenue Bonds (Metro Biosolids Management LLC Project), AMT, 6% due 11/01/2023 10,285 3,140 Illinois Development Finance Authority Revenue Bonds (Community Rehabilitation Providers Facilities), Series A, 6.50% due 7/01/2022 3,348 Illinois State Finance Authority Revenue Bonds, Series A: 1,750 (Friendship Village of Schaumburg), 5.625% due 2/15/2037 1,791 2,155 (Landing At Plymouth Place Project), 6% due 5/15/2037 2,269 Illinois State, GO, 1st Series (f): 8,890 5.75% due 12/01/2015 9,389 3,745 5.75% due 12/01/2016 3,956 4,000 5.75% due 12/01/2017 4,227 3,000 Illinois State, Sales Tax Revenue Bonds, 6% due 6/15/2020 3,159 2,000 Illinois State, Sales Tax Revenue Refunding Bonds, Series Q, 6% due 6/15/2009 2,049 2,000 Lake County, Illinois, Forest Preservation District, GO (Land Acquisition and Development), 5.75% due 12/15/2010 (j) 2,116 16,160 Metropolitan Pier and Exposition Authority, Illinois, Dedicated State Tax Revenue Bonds (McCormick Place Expansion), Series A, 5.25% due 6/15/2042 (f) 16,864 625 Naperville, Illinois, IDR (General Motors Corporation), Refunding, VRDN, 7.50% due 12/01/2012 (g) 625 1,585 Village of Wheeling, Illinois, Revenue Bonds (North Milwaukee/Lake-Cook Tax Increment Financing (TIF) Redevelopment Project), 6% due 1/01/2025 1,599 Indiana--0.5% 7,350 Indiana Bond Bank, Special Program Revenue Bonds (Town of Westfield and West Central Conservancy District Projects), Series A, 5.125% due 10/01/2022 (f) 7,632 Iowa--0.4% 1,000 Iowa City, Iowa, Sewer Revenue Bonds, 5.75% due 7/01/2021 (f) 1,001 3,905 Iowa Finance Authority, Health Care Facilities, Revenue Refunding Bonds (Care Initiatives Project), 9.25% due 7/01/2011 (j) 4,677 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (continued) BlackRock National Municipal Fund (In Thousands) Face Amount Municipal Bonds Value Kansas--0.7% $ 6,870 Sedgwick and Shawnee Counties, Kansas, S/F Mortgage Revenue Bonds (Mortgage-Backed Securities Program), AMT, Series B-2, 5.25% due 12/01/2038 (i)(l) $ 7,062 1,425 Sedgwick and Shawnee Counties, Kansas, S/F Revenue Bonds, AMT, Series A-1, 6.95% due 6/01/2029 (d) 1,481 2,500 Wichita, Kansas, Hospital Facilities Revenue Refunding and Improvement Bonds, Series III, 6.25% due 11/15/2019 2,694 Louisiana--1.1% 2,000 Houma-Terrebonne Public Trust Financing Authority, Louisiana, S/F Mortgage Revenue Bonds (Mortgage-Backed Securities Program), 5.15% due 12/01/2040 (i)(l) 2,048 370 Louisiana HFA, S/F Mortgage Revenue Bonds, AMT, Series D-2, 5.80% due 6/01/2020 (i) 372 7,000 Louisiana Local Government Environmental Facilities and Community Development Authority, Revenue Bonds (Capital Projects and Equipment Acquisition), Series A, 6.30% due 7/01/2030 (c) 8,101 5,000 Louisiana Public Facilities Authority Revenue Bonds (University of New Orleans Research and Technology Foundation, Inc.--Student Housing Project), 5.25% due 3/01/2037 (f) 5,267 200 Louisiana State, HFA, S/F Revenue Refunding Bonds (Home Ownership Program), Series B-2, AMT, 6.20% due 12/01/2029 (b)(i) 202 2,000 Rapides Finance Authority, Louisiana, Environmental Improvement Revenue Bonds (International Paper Company Project), AMT, Series A, 6.55% due 11/15/2023 2,094 Maine--0.5% 8,635 Maine Finance Authority, Solid Waste Recycling Facilities Revenue Bonds (Great Northern Paper Project--Bowater), AMT, 7.75% due 10/01/2022 8,696 Maryland--0.4% 500 Anne Arundel County, Maryland, Special Obligation Revenue Bonds (Arundel Mills Project), 7.10% due 7/01/2009 (j) 539 1,000 Maryland State Community Development Administration, Department of Housing and Community Development, Housing Revenue Bonds, AMT, Series B, 6.15% due 1/01/2021 1,024 1,000 Maryland State Community Development Administration, Department of Housing and Community Development Revenue Bonds (Waters Landing II Apartments), AMT, Series A, 5.875% due 8/01/2033 1,030 1,000 Maryland State Energy Financing Administration, Solid Waste Disposal Revenue Bonds, Limited Obligation (Wheelabrator Water Projects), AMT, 6.45% due 12/01/2016 1,021 3,200 Maryland State Health and Higher Educational Facilities Authority Revenue Bonds (King Farm Presbyterian Community), Series B, 5% due 1/01/2017 3,203 Massachusetts--1.6% 255 Massachusetts Educational Financing Authority, Education Loan Revenue Refunding Bonds, AMT, Issue E, 5.85% due 7/01/2014 (c) 257 Face Amount Municipal Bonds Value Massachusetts (concluded) $ 3,850 Massachusetts State Health and Educational Facilities Authority Revenue Bonds (Medical Center of Central Massachusetts), CARS, Series B, 9.02% due 6/23/2022 (c)(n) $ 4,018 1,000 Massachusetts State Industrial Finance Agency, Higher Education Revenue Refunding Bonds (Hampshire College Project), 5.625% due 10/01/2007 (j) 1,024 130 Massachusetts State Water Pollution Abatement Trust, Water Abatement Revenue Bonds, Series A, 6.375% due 2/01/2015 130 1,600 Montachusett, Massachusetts, Regional Vocational Technical School District, GO, 5.95% due 1/15/2020 (f) 1,690 19,000 Route 3 North Transit Improvement Association, Massachusetts, Lease Revenue Refunding Bonds, VRDN, Series B, 3.73% due 6/15/2033 (c)(g) 19,000 Michigan--1.1% 7,500 Delta County, Michigan, Economic Development Corporation, Environmental Improvement Revenue Refunding Bonds (Mead Westvaco-Escanaba), Series A, 6.25% due 4/15/2012 (j) 8,215 500 Dickinson County, Michigan, Economic Development Corporation, Environmental Improvement Revenue Refunding Bonds (International Paper Company Project), Series A, 5.75% due 6/01/2016 521 Eastern Michigan University, General Revenue Refunding Bonds (c): 585 6% due 6/01/2010 (j) 623 415 6% due 6/01/2024 441 3,000 Flint, Michigan, Hospital Building Authority, Revenue Refunding Bonds (Hurley Medical Center), 6% due 7/01/2020 3,127 3,325 Macomb County, Michigan, Hospital Finance Authority, Hospital Revenue Bonds (Mount Clemens General Hospital), Series B, 5.875% due 11/15/2034 3,497 1,500 Michigan State Hospital Finance Authority, Revenue Refunding Bonds (Mercy-Mount Clemens), Series A, 6% due 5/15/2014 (f) 1,565 Minnesota--1.4% 520 Anoka County, Minnesota, Solid Waste Disposal Revenue Bonds (Natural Rural Utilities), AMT, Series A, 6.95% due 12/01/2008 534 1,000 Eden Prairie, Minnesota, M/F Housing Revenue Bonds (Rolling Hills Project), Series A, 6.15% due 8/20/2031 (d) 1,081 8,875 Minneapolis and Saint Paul, Minnesota, Housing Finance Board, S/F Mortgage Revenue Bonds (Mortgaged-Backed Securities Program--City Living), AMT, Series A-1, 5.25% due 12/01/2040 (i)(l) 8,962 Minneapolis and Saint Paul, Minnesota, Metropolitan Airports Commission, Airport Revenue Bonds, AMT, Sub-Series D (e): 470 5.75% due 1/01/2012 492 470 5.75% due 1/01/2014 491 2,060 5.75% due 1/01/2015 2,158 Minneapolis, Minnesota, Health Care System Revenue Bonds (Allina Health System), Series A: 1,500 5.70% due 11/15/2022 1,567 2,665 5.75% due 11/15/2032 2,811 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (continued) BlackRock National Municipal Fund (In Thousands) Face Amount Municipal Bonds Value Minnesota (concluded) $ 1,110 Ramsey County, Minnesota, Housing and Redevelopment Authority, M/F Housing Revenue Bonds (Hanover Townhouses Project), AMT, 6% due 7/01/2031 $ 1,130 1,000 Saint Cloud, Minnesota, Health Care Revenue Refunding Bonds (Saint Cloud Hospital Obligation Group), Series A, 6.25% due 5/01/2020 (h) 1,066 1,500 Waconia, Minnesota, Health Care Facilities Revenue Bonds (Ridgeview Medical Center Project), Series A, 6.125% due 1/01/2010 (j)(m) 1,577 Mississippi--0.4% 4,000 Mississippi Home Corporation, S/F Mortgage Revenue Bonds, Series A-1, 5.50% due 6/01/2038 (i)(l) 4,227 1,700 Warren County, Mississippi, Environmental Improvement Revenue Refunding Bonds (International Paper Company Project), AMT, Series B, 6.75% due 8/01/2021 1,799 Missouri--0.6% 1,000 Fenton, Missouri, Tax Increment Revenue Refunding and Improvement Bonds (Gravois Bluffs Redevelopment Project), 5% due 4/01/2014 1,032 1,500 Kansas City, Missouri, IDA, First Mortgage Health Facilities Revenue Bonds (Bishop Spencer Place), Series A, 6.50% due 1/01/2035 1,577 6,500 Missouri State Housing Development Commission, S/F Mortgage Revenue Bonds (Homeownership Loan Program), AMT, Series E-1, 5.60% due 3/01/2037 (i) 6,855 Montana--0.6% 3,000 Montana State Board of Housing, S/F Mortgage Revenue Refunding Bonds, AMT, Series A-2, 5.50% due 6/01/2037 3,139 6,000 Montana State Higher Education, Student Assistance Corporation, Student Loan Revenue Refunding Bonds, AMT, Sub-Series B, 6.40% due 12/01/2032 6,234 Nevada--1.7% 3,500 Clark County, Nevada, Airport Revenue Bonds (Jet Aviation Fuel Tax), AMT, Series C, 5.375% due 7/01/2020 (c) 3,656 1,545 Clark County, Nevada, Improvement District Number 142, Special Assessment Bonds, 6.375% due 8/01/2023 1,593 Elko, Nevada, GO (Airport Improvement), AMT, Series B (f): 165 6.10% due 10/01/2014 167 245 6.30% due 10/01/2019 249 320 6.75% due 10/01/2024 325 225 7% due 10/01/2029 229 2,535 Henderson, Nevada, Local Improvement Districts, Special Assessment, Series NO T-14, 5.80% due 3/01/2023 2,613 Las Vegas, Nevada, Local Improvement Bonds, Special Assessment, Special Improvement District Number 808, Summerlin: 1,730 5.875% due 6/01/2009 1,769 1,990 6.125% due 6/01/2012 2,060 2,220 6.25% due 6/01/2013 2,299 1,880 Reno, Nevada, Special Assessment District Number 4 (Somerset Parkway), 6.625% due 12/01/2022 1,939 Face Amount Municipal Bonds Value Nevada (concluded) Sparks, Nevada, Redevelopment Agency, Tax Allocation Revenue Refunding Bonds, Series A (m): $ 3,110 6% due 1/15/2015 $ 3,258 6,315 6% due 1/15/2023 6,607 New Hampshire--0.2% New Hampshire Health and Education Facilities Authority, Revenue Refunding Bonds: 1,750 (Elliot Hospital), Series B, 5.60% due 10/01/2022 1,824 590 (Havenwood-Heritage Heights Retirement Community), Series A, 5% due 1/01/2016 587 1,035 (Havenwood-Heritage Heights Retirement Community), Series A, 5.35% due 1/01/2026 1,036 New Jersey--2.0% 310 Camden County, New Jersey, Pollution Control Financing Authority, Solid Waste Resource Recovery, Revenue Refunding Bonds, AMT, Series B, 7.50% due 12/01/2009 314 3,300 New Jersey EDA, Retirement Community Revenue Bonds (Cedar Crest Village Inc. Facility), Series A, 7.25% due 11/15/2011 (j) 3,732 3,680 New Jersey EDA, State Lease Revenue Bonds (State Office Buildings Projects), 6% due 6/15/2010 (c)(j) 3,892 3,130 New Jersey Health Care Facilities Financing Authority Revenue Bonds (South Jersey Hospital), 6% due 7/01/2012 (j) 3,389 2,250 New Jersey Health Care Facilities Financing Authority, Revenue Refunding Bonds (Capital Health System Inc.), Series A, 5.75% due 7/01/2023 2,364 640 New Jersey State Housing and Mortgage Finance Agency, M/F Housing Revenue Refunding Bonds, Series B, 6.25% due 11/01/2026 (h) 663 New Jersey State Turnpike Authority, Turnpike Revenue Refunding Bonds, Series A (f): 7,025 5.75% due 1/01/2010 (j) 7,332 2,975 5.75% due 1/01/2018 (s) 3,099 7,000 Tobacco Settlement Financing Corporation of New Jersey, Asset-Backed Revenue Bonds, 7% due 6/01/2013 (j) 8,089 New Mexico--0.7% 8,000 Farmington, New Mexico, PCR, Refunding (Public Service Company of New Mexico--San Juan Project), Series B, 6.30% due 12/01/2016 8,172 50 New Mexico Mortgage Finance Authority, Revenue Refunding Bonds, Mortgage-Backed Securities, Series F, 7% due 1/01/2026 (i) 50 3,165 New Mexico Mortgage Financing Authority, S/F Mortgage Program Revenue Bonds, AMT, Series D, 6.15% due 7/01/2035 (i)(l) 3,322 250 Santa Fe County, New Mexico, Correctional System Revenue Bonds, 6% due 2/01/2027 (h) 291 New York--4.2% 10,000 Metropolitan Transportation Authority, New York, Transit Facilities Revenue Bonds, Series A, 5.625% due 7/01/2007 (f)(j) 10,151 3,230 New York City, New York, City IDA, Civic Facility Revenue Bonds (Special Needs Facilities Pooled Program), Series C-1, 6% due 7/01/2012 3,333 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (continued) BlackRock National Municipal Fund (In Thousands) Face Amount Municipal Bonds Value New York (concluded) $ 4,050 New York City, New York, City IDA, Special Facility Revenue Bonds (British Airways Plc Project), AMT, 7.625% due 12/01/2032 $ 4,452 New York City, New York, GO, Refunding: 6,540 Series A, 6% due 5/15/2010 (j) 6,976 2,205 Series A, 6.25% due 5/15/2010 (j)(k) 2,367 60 Series A, 6% due 5/15/2021 (k) 64 675 Series H, 6% due 8/01/2007 (j)(k) 683 325 Series H, 6% due 8/01/2017 (k) 329 New York City, New York, GO, Series B (f): 6,640 5.875% due 8/01/2010 (j) 7,085 1,300 5.875% due 8/01/2015 1,384 New York State Dormitory Authority, Non-State Supported Debt, Revenue Refunding Bonds (Mount Sinai-NYU Medical Center Health System), Series A: 590 6.50% due 7/01/2010 (j) 638 2,410 6.50% due 7/01/2016 2,555 1,680 New York State Dormitory Authority, Revenue Refunding Bonds, Series A: (Mount Sinai Health), 6.50% due 7/01/2025 1,777 3,000 (State University Educational Facilities), 7.50% due 5/15/2013 3,512 1,360 New York State Environmental Facilities Corporation, State Clean Water and Drinking Revenue Bonds (Revolving Funds), Series B, 5.875% due 1/15/2019 1,427 2,285 Oneida County, New York, IDA Revenue Bonds (Civic Facility-Faxton Hospital), Series C, 6.625% due 1/01/2015 (m) 2,436 3,000 Port Authority of New York and New Jersey, Consolidated Revenue Bonds, AMT, Thirty-Seventh Series, 5.50% due 7/15/2018 (h) 3,218 95 Suffolk County, New York, IDA, Civic Facility Revenue Bonds (Special Needs Facilities Pooled Program), Series D-1, 6% due 7/01/2012 98 5,000 Triborough Bridge and Tunnel Authority, New York, Subordinate Revenue Bonds, 5.125% due 11/15/2026 (c) 5,211 705 Westchester County, New York, IDA, Civic Facilities Revenue Bonds (Special Needs Facilities Pooled Program), Series E-1, 6% due 7/01/2012 726 8,095 Westchester County, New York, IDA, Continuing Care Retirement, Mortgage Revenue Bonds (Kendal on Hudson Project), Series A, 6.50% due 1/01/2034 8,606 North Carolina--2.8% 920 Brunswick County, North Carolina, COP, 6% due 6/01/2010 (h)(j) 981 4,000 North Carolina Eastern Municipal Power Agency, Power System Revenue Bonds, Series D, 6.75% due 1/01/2026 4,250 4,440 North Carolina Eastern Municipal Power Agency, Power System Revenue Refunding Bonds, Series D, 6.70% due 1/01/2019 (o) 4,723 4,390 North Carolina HFA, Home Ownership Revenue Bonds, AMT, Series 9-A, 5.80% due 1/01/2020 4,508 North Carolina Medical Care Commission, Health Care Facilities, First Mortgage Revenue Bonds (Presbyterian Homes Project): 2,500 6.875% due 10/01/2010 (j) 2,718 3,000 5.50% due 10/01/2031 3,094 Face Amount Municipal Bonds Value North Carolina (concluded) North Carolina Medical Care Commission, Health Care Facilities, First Mortgage Revenue Refunding Bonds: $ 2,500 (Presbyterian Homes Project), Series B, 5.20% due 10/01/2021 $ 2,525 1,100 (Salemtowne Project), 5.10% due 10/01/2030 1,076 North Carolina Medical Care Commission, Retirement Facilities, First Mortgage Revenue Bonds (j): 1,625 (Forest at Duke Project), 6.375% due 9/01/2012 1,715 2,500 (Givens Estates Project), Series A, 6.50% due 7/01/2013 2,830 5,000 North Carolina Medical Care Commission, Retirement Facilities, First Mortgage Revenue Refunding Bonds (Forest at Duke Project), 5.125% due 9/01/2032 5,025 North Carolina Municipal Power Agency Number 1, Catawba Electric Revenue Refunding Bonds, Series B: 500 6.375% due 1/01/2013 528 1,080 6.375% due 1/01/2013 (o) 1,141 5,000 6.50% due 1/01/2020 5,315 2,500 6.50% due 1/01/2020 (o) 2,657 Piedmont Triad Airport Authority, North Carolina, Airport Revenue Refunding Bonds, Series A (h)(j): 1,000 6% due 7/01/2009 1,051 1,000 6.375% due 7/01/2009 1,058 Ohio--1.3% 285 Ohio HFA, Mortgage Revenue Bonds, AMT, Series A-1, 6.15% due 3/01/2029 (d) 292 6,900 Ohio HFA, Mortgage Revenue Refunding Bonds, AMT, Series C, 5.90% due 9/01/2035 (i) 7,154 8,000 Ohio State Air Quality Development Authority Revenue Refunding Bonds (Ohio Power Company), Series C, 5.15% due 5/01/2026 (c) 8,201 1,470 Port of Greater Cincinnati Development Authority, Ohio, Special Assessment Revenue Bonds (Cooperative Public Parking Infrastructure Project), 6.40% due 2/15/2034 1,567 3,005 Toledo-Lucas County, Ohio, Lodging Tax Revenue Refunding Bonds (Convention Center Project), 5.70% due 10/01/2015 (f) 3,069 Oklahoma--0.6% 10,000 Tulsa County, Oklahoma, Industrial Authority, Health Care Revenue Refunding Bonds (Saint Francis Health System), 5% due 12/15/2036 10,105 Oregon--0.3% Forest Grove, Oregon, Campus Improvement Revenue Refunding Bonds (Pacific University) (j)(m): 250 6% due 5/01/2010 264 250 6.20% due 5/01/2010 265 Oregon State Housing and Community Services Department, Mortgage Revenue Refunding Bonds (S/F Mortgage Program) Series A: 55 6.40% due 7/01/2018 56 35 AMT, 6.20% due 7/01/2027 36 500 Portland, Oregon, M/F Housing Authority Revenue Bonds (Lovejoy Station Apartments Project), AMT, 5.90% due 7/01/2023 (f) 511 Portland, Oregon, Urban Renewal and Redevelopment Revenue Refunding Bonds, Series A (c): 1,000 (Downtown Waterfront), 5.75% due 6/15/2018 1,058 3,190 (South Park Blocks), 5.75% due 6/15/2018 3,374 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (continued) BlackRock National Municipal Fund (In Thousands) Face Amount Municipal Bonds Value Pennsylvania--1.7% $ 3,640 Allegheny County, Pennsylvania, IDA, Environmental Improvement Revenue Refunding Bonds, 5.50% due 11/01/2016 $ 3,832 2,220 Allegheny County, Pennsylvania, Sanitation Authority, Sewer Revenue Bonds, 5.75% due 12/01/2010 (f)(j) 2,362 1,760 Bucks County, Pennsylvania, IDA, Retirement Community Revenue Bonds (Ann's Choice Inc.), Series A, 6.125% due 1/01/2025 1,854 7,750 Delaware County, Pennsylvania, IDA, Revenue Refunding Bonds (Resource Recovery Facility), Series A, 6.10% due 7/01/2013 7,960 1,000 Harrisburg, Pennsylvania, Authority, University Revenue Bonds (Harrisburg University of Science), Series A, 5.40% due 9/01/2016 1,003 4,000 Pennsylvania State Higher Educational Facilities Authority Revenue Bonds (University of Pennsylvania Medical Center Health System), Series A, 6% due 1/15/2031 4,268 1,265 Philadelphia, Pennsylvania, Authority for IDR, Commercial Development, 7.75% due 12/01/2017 1,268 Sayre, Pennsylvania, Health Care Facilities Authority, Revenue Refunding Bonds (Guthrie Healthcare System), Series A: 3,915 5.875% due 12/01/2011 (j) 4,236 1,085 5.875% due 12/01/2031 1,150 Rhode Island--0.5% 6,815 Rhode Island State Economic Development Corporation, Airport Revenue Bonds, Series B, 6% due 7/01/2010 (e)(j) 7,270 1,000 Rhode Island State Economic Development Corporation Revenue Bonds (Providence Place Mall), 6.125% due 7/01/2020 (m) 1,082 South Carolina--0.9% Medical University Hospital Authority, South Carolina, Hospital Facilities Revenue Refunding Bonds (j): 2,450 6.50% due 8/15/2012 2,731 5,400 Series A, 6.375% due 8/15/2012 5,989 5,000 South Carolina Jobs EDA, Residential Care Facilities Revenue Bonds (South Carolina Episcopal-- Still Hopes Residence Project), Series A, 6.375% due 5/15/2032 5,210 South Dakota--0.4% 3,750 Pierre, South Dakota, School District Number 32-2, GO, 5.75% due 8/01/2010 (h)(j) 3,945 1,680 South Dakota, HDA, Homeownership Revenue Bonds, AMT, Series C, 5.375% due 5/01/2018 1,704 Tennessee--1.4% Chattanooga, Tennessee, IDB, Lease Rent Revenue Bonds (Southside Redevelopment Corporation) (c): 4,485 5.75% due 10/01/2017 4,728 3,740 5.75% due 10/01/2018 3,928 1,000 Johnson City, Tennessee, Health and Educational Facilities Board, Retirement Facility Revenue Bonds (Appalachian Christian Village Project), Series A, 6.25% due 2/15/2032 1,039 4,950 McMinn County, Tennessee, IDB, Solid Waste Revenue Bonds (Recycling Facility-Calhoun Newsprint), AMT, 7.40% due 12/01/2022 5,014 7,300 Shelby County, Tennessee, Health, Educational and Housing Facility Board, Hospital Revenue Refunding Bonds (Methodist Healthcare), 6.50% due 9/01/2012 (j) 8,145 Face Amount Municipal Bonds Value Texas--12.8% $ 5,000 Alliance Airport Authority, Inc., Texas, Special Facilities Revenue Refunding Bonds (American Airlines Inc. Project), AMT, 5.75% due 12/01/2029 $ 4,984 Austin, Texas, Convention Center Revenue Bonds (Convention Enterprises Inc.), First Tier, Series A (j): 5,300 6.60% due 1/01/2011 5,745 2,300 6.70% due 1/01/2011 2,500 10,630 Austin, Texas, Revenue Bonds (Town Lake Community Events Center Venue), 6.20% due 11/15/2009 (e)(j) 11,189 Bexar County, Texas, Health Facilities Development Corporation, Revenue Refunding Bonds (Army Retirement Residence Project) (j): 600 6.125% due 7/01/2012 660 1,750 6.30% due 7/01/2012 1,939 2,280 Brazos River Authority, Texas, PCR, Refunding (TXU Energy Company LLC Project), AMT, Series A, 7.70% due 4/01/2033 2,592 4,250 Brazos River Authority, Texas, Revenue Refunding Bonds (Reliant Energy Inc. Project), Series B, 7.75% due 12/01/2018 4,431 3,700 Brazos River, Texas, Harbor Navigation District, Brazoria County Environmental Revenue Refunding Bonds (Dow Chemical Company Project), AMT, Series A-7, 6.625% due 5/15/2033 4,021 525 Central Texas Housing Finance Corporation, S/F Mortgage Revenue Bonds (GNMA Mortgage Program), AMT, 8.20% due 6/28/2017 (b)(d) 542 3,620 Dallas-Fort Worth, Texas, International Airport Facility Improvement Corporation, Revenue Bonds (Learjet Inc.), AMT, Series A-1, 6.15% due 1/01/2016 3,639 600 Dallas, Texas, Industrial Development Corporation, IDR (CR/PL Inc. Project), AMT, 7.50% due 8/01/2017 603 4,825 Dawson County, Texas, Hospital District, GO, 5.125% due 2/15/2031 (c) 4,977 1,260 Fort Bend County, Texas, Municipal Utility District Number 23, GO, 6.625% due 9/01/2007 (j)(m) 1,266 Gregg County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Good Shepherd Medical Center Project) (j)(m): 3,500 6.375% due 10/01/2010 3,783 1,000 6.875% due 10/01/2010 1,096 5,465 Gulf Coast Waste Disposal Authority, Texas, Revenue Refunding Bonds (International Paper Company), AMT, Series A, 6.10% due 8/01/2024 5,759 HFDC of Central Texas, Inc., Retirement Facilities Revenue Bonds, Series A: 2,255 5.75% due 11/01/2036 2,317 1,850 (Village at Gleannloch Farms), 5.50% due 2/15/2037 1,880 15,000 Houston, Texas, Airport System Revenue Refunding Bonds, Sub-Lien, AMT, Series A, 5.50% due 7/01/2023 (h) 15,460 6,000 Houston, Texas, Airport System, Special Facilities Revenue Bonds (Continental Airlines), AMT, Series E, 7% due 7/01/2029 6,451 Houston, Texas, Combined Utility System, First Lien Revenue Refunding Bonds, Series A: 2,000 5.125% due 5/15/2028 (f) 2,071 13,600 5% due 11/15/2036 (h) 14,010 4,000 Kerrville, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Sid Peterson Memorial Hospital Project), 5.25% due 8/15/2021 4,086 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (continued) BlackRock National Municipal Fund (In Thousands) Face Amount Municipal Bonds Value Texas (concluded) $ 8,080 Matagorda County, Texas, Navigation District Number 1, Revenue Refunding Bonds (Reliant Energy Inc.), Series C, 8% due 5/01/2029 $ 8,427 7,350 Matagorda County, Texas, Port of Bay City Authority Revenue Bonds (Hoechst Celanese Corp. Project), AMT, 6.50% due 5/01/2026 7,433 4,825 Port Corpus Christi, Texas, Individual Development Corporation, Environmental Facilities Revenue Bonds (Citgo Petroleum Corporation Project), AMT, 8.25% due 11/01/2031 4,933 1,000 Red River, Texas, Education Finance Revenue Bonds (Saint Mark's School--Texas Project), 6% due 8/15/2019 1,044 830 South Plains, Texas, Housing Finance Corporation, S/F Mortgage Revenue Bonds, AMT, Series A, 7.30% due 9/01/2031 (i) 841 Southeast Texas Housing Finance Corporation, Revenue Bonds, AMT (d)(l): 10 Series A, 8% due 11/01/2025 10 120 Series B, 8.50% due 11/01/2025 122 Tarrant County, Texas, Cultural Education Facilities Financing Corporation, Retirement Facilities Revenue Refunding Bonds (Northwest Senior Housing-- Edgemere Project), Series A: 2,200 6% due 11/15/2026 2,338 3,000 6% due 11/15/2036 3,173 Texas State Affordable Housing Corporation, S/F Mortgage Revenue Bonds, AMT (i)(l): 5,000 (Fire Fighter and Law Enforcement or Security Officer Home Loan Program), Series C, 5.45% due 12/01/2039 5,196 6,250 (Professional Educators Home Loan Program), Series A-1, 5.50% due 12/01/2039 6,520 Texas State Public Finance Authority, Building Revenue Bonds (h)(j): 2,100 (General Services Commission Project), Series A, 6% due 2/01/2010 2,206 1,000 (State Preservation Project), Series B, 6% due 8/01/2009 1,043 45,000 Texas State Turnpike Authority, Central Texas Turnpike System Revenue Bonds, First Tier, Series A, 5.75% due 8/15/2038 (c) 48,057 4,930 Upper Trinity Regional Water District, Texas, Water Revenue Bonds (Regional Treated Water Supply System), Series A, 6% due 8/01/2010 (e)(j) 5,221 Webster, Texas, GO, COP, Series A (h): 1,500 6% due 3/01/2010 (j) 1,577 805 6% due 3/01/2021 845 1,250 West Central Texas Regional Housing Finance Corporation, S/F Mortgage Revenue Bonds (Mortgage- Backed Securities Program), AMT, Series A, 5.35% due 12/01/2039 (i)(l) 1,282 Utah--0.0% 755 Utah State HFA, S/F Mortgage Revenue Refunding Bonds, AMT, Series C, Class III, 5.50% due 1/01/2018 764 Virginia--0.6% Albermarle County, Virginia, IDA, Residential Care Facilities, Mortgage Revenue Refunding Bonds (Westminster-Canterbury): 1,750 5% due 1/01/2024 1,754 1,100 5% due 1/01/2031 1,095 Face Amount Municipal Bonds Value Virginia (concluded) $ 2,425 Chesterfield County, Virginia, IDA, PCR, Refunding (Virginia Electric and Power Company), Series B, 5.875% due 6/01/2017 $ 2,581 3,250 Fairfax County, Virginia, EDA, Residential Care Facilities, Mortgage Revenue Refunding Bonds (Goodwin House, Inc.), 5.125% due 10/01/2037 3,261 Norfolk, Virginia, Redevelopment and Housing Authority, First Mortgage Revenue Bonds (Retirement Community), Series A: 500 6% due 1/01/2025 521 1,100 6.125% due 1/01/2035 1,149 Washington--1.7% 5,000 Energy Northwest, Washington, Electric Revenue Refunding Bonds (Project Number 3), Series A, 5.50% due 7/01/2017 (h) 5,308 3,000 Port of Seattle, Washington, Special Facilities Revenue Bonds, Series A, 6% due 3/01/2010 (f)(j) 3,183 3,010 Seattle, Washington, Drain and Wastewater Utility Revenue Bonds, 5.75% due 11/01/2009 (f)(j) 3,163 Seattle, Washington, Housing Authority Revenue Bonds: 2,750 (Newholly Project), AMT, 6.25% due 12/01/2035 2,839 4,710 (Replacement Housing Project), 6.125% due 12/01/2032 4,820 7,750 Tacoma, Washington, Electric System Revenue Refunding Bonds, Series A, 5.75% due 1/01/2011 (h)(j) 8,266 Wisconsin--0.6% 990 Wisconsin Housing and Economic Development Authority, Home Ownership Revenue Bonds, AMT, Series C, 6% due 9/01/2036 1,043 1,960 Wisconsin State, GO, AMT, Series B, 6.20% due 11/01/2026 (f) 1,979 Wisconsin State Health and Educational Facilities Authority Revenue Bonds (SynergyHealth Inc.): 3,155 6% due 11/15/2023 3,360 3,700 6% due 11/15/2032 3,954 Guam--0.0% 115 Guam Housing Corporation, S/F Mortgage Revenue Bonds, AMT, Series A, 5.75% due 9/01/2031 (l) 120 Puerto Rico--2.3% 8,045 Puerto Rico Commonwealth Highway and Transportation Authority, Transportation Revenue Bonds, 5.75% due 7/01/2022 8,660 Puerto Rico Commonwealth Infrastructure Financing Authority, Special Tax and Capital Appreciation Revenue Bonds, Series A (p): 10,000 4.83% due 7/01/2030 (e) 3,358 10,000 4.64% due 7/01/2032 (e) 3,030 12,605 4.96% due 7/01/2035 (c) 3,278 Puerto Rico Commonwealth, Public Improvement, GO, Refunding: 785 5.70% due 7/01/2020 (f) 823 5,500 Series B, 5.25% due 7/01/2032 5,732 11,665 Puerto Rico Electric Power Authority, Power Revenue Bonds, Series NN, 5.125% due 7/01/2013 (j) 12,398 U.S. Virgin Islands--0.6% 8,000 Virgin Islands Government Refinery Facilities, Revenue Refunding Bonds (Hovensa Coker Project), AMT, 6.50% due 7/01/2021 8,915 Total Municipal Bonds (Cost--$1,371,784)--87.7% 1,411,830 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (concluded) BlackRock National Municipal Fund (In Thousands) Face Amount Municipal Bonds Held in Trust (a) Value California--1.9% $28,500 Los Angeles, California, Unified School District, GO, Series A, 5% due 1/01/2028 (f) $ 30,133 Connecticut--0.7% 10,045 Connecticut State Health and Educational Facilities Authority Revenue Refunding Bonds (Eastern Connecticut Health Network), Series A, 6.50% due 7/01/2030 (m) 10,854 Florida--2.2% 14,000 Lee County, Florida, Airport Revenue Bonds, AMT, Series A, 6% due 10/01/2029 (h) 14,845 20,115 Port St. Lucie, Florida, Utility Revenue Bonds, 5.125% due 9/01/2036 (f) 20,989 Illinois--1.4% 21,235 Chicago, Illinois, Board of Education, GO (Chicago School Reform), 5.75% due 12/01/2007 (c) 21,827 Michigan--0.9% 13,500 Hartland, Michigan, Consolidated School District, GO, Refunding, 5.125% due 5/01/2029 13,800 New Jersey--2.7% 22,000 New Jersey EDA, School Facilities Construction Revenue Bonds, Series O, 5.25% due 3/01/2024 23,279 20,000 New Jersey State Turnpike Authority, Turnpike Revenue Refunding Bonds, Series A, 5.75% due 1/01/2018 (f) 20,832 Pennsylvania--2.4% 36,210 Philadelphia, Pennsylvania, Redevelopment Authority Revenue Bonds (Neighborhood Transformation), Series A, 5.3% due 4/15/2026 (e) 37,758 South Carolina--1.3% 21,215 South Carolina State Ports Authority, Ports Revenue Bonds, AMT, 5.30% due 7/01/2026 (h) 21,587 Face Amount Municipal Bonds Held in Trust (a) Value Texas--4.8% $36,500 Dallas-Fort Worth, Texas, International Airport Revenue Bonds, AMT, Series A, 6% due 11/01/2024 (e) $ 37,881 18,860 Houston, Texas, Airport System Revenue Refunding Bonds, Sub Lien, Series B, 5.20% due 7/01/2018 (e) 19,129 20,000 Houston, Texas, Combined Utility System, First Lien Revenue Refunding Bonds, Series A, 5.125% due 5/15/2028 (f) 20,712 Puerto Rico--0.8% 4,000 Puerto Rico Commonwealth, Public Improvement, GO, Refunding, 5.7% due 7/01/2020 (f) 4,191 Puerto Rico Industrial Tourist Educational, Medical and Environmental Control Facilities Revenue Bonds (Hospital de la Concepcion), Series A: 4,000 6.125% due 11/15/2025 4,265 4,220 6.125% due 11/15/2030 4,515 Total Municipal Bonds Held in Trust (Cost--$305,809)--19.1% 306,597 Shares Held Short-Term Securities 28,606 Merrill Lynch Institutional Tax-Exempt Fund, 3.59% (q)(r) 28,606 Total Short-Term Securities (Cost--$28,606)--1.8% 28,606 Total Investments (Cost--$1,706,199*)--108.6% 1,747,033 Other Assets Less Liabilities--0.9% 15,368 Liability for Trust Certificates, Including Interest Expense Payable--(9.5%) (153,434) ------------ Net Assets--100.0% $ 1,608,967 ============ * The cost and unrealized appreciation (depreciation) of investments as of June 30, 2007, as computed for federal income tax purposes, were as follows: Aggregate cost $ 1,557,397 =============== Gross unrealized appreciation $ 47,287 Gross unrealized depreciation (9,447) --------------- Net unrealized appreciation $ 37,840 =============== (a) Securities represent underlying bonds transferred to a separate securitization trust established in a tender option bond transaction in which the Fund may have acquired the residual interest certificates. These securities serve as collateral in a financing transaction. See Note 1(c) to Financial Statements for details of municipal bonds held in trust. (b) FHA Insured. (c) AMBAC Insured. (d) GNMA Collateralized. (e) FGIC Insured. (f) MBIA Insured. (g) Security may have a maturity of more than one year at time of issuance, but has variable rate and demand features that qualify it as a short-term security. The rate disclosed is that currently in effect. This rate changes periodically based upon prevailing market rates. (h) FSA Insured. (i) FNMA/GNMA Collateralized. (j) Prerefunded. (k) XL Capital Insured. (l) FHLMC Collateralized. (m) Radian Insured. (n) The rate disclosed is that currently in effect. This rate changes periodically and inversely based upon prevailing market rates. (o) ACA Insured. (p) Represents a zero coupon bond; the interest rate shown reflects the effective yield at the time of purchase. (q) Represents the current yield as of June 30, 2007. (r) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: Net Dividend Affiliate Activity Income Merrill Lynch Institutional Tax-Exempt Fund (24,918) $1,477 (s) Escrowed to maturity. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments as of June 30, 2007 BlackRock High Yield Municipal Fund (In Thousands) Face Amount Municipal Bonds Value Alabama--0.7% $ 500 Tuscaloosa, Alabama, Special Care Facilities Financing Authority, Residential Care Facility Revenue Bonds (Capstone Village, Inc. Project), Series A, 5.875% due 8/01/2036 $ 504 Arizona--3.9% 300 Maricopa County, Arizona, IDA, Education Revenue Bonds (Arizona Charter Schools Project 1), Series A, 6.75% due 7/01/2029 304 1,000 Phoenix, Arizona, IDA, Airport Facility, Revenue Refunding Bonds (America West Airlines Inc. Project), AMT, 6.30% due 4/01/2023 1,013 285 Pima County, Arizona, IDA, Education Revenue Refunding Bonds (Arizona Charter Schools Project), Series O, 5.25% due 7/01/2031 289 700 Pima County, Arizona, IDA, S/F Mortgage Revenue Refunding Bonds, VRDN, AMT, 5.23% due 4/25/2008 (j) 700 500 Queen Creek Improvement District Number 001, Arizona, Special Assessment Bonds, 5% due 1/01/2032 496 California--4.8% 1,500 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Refunding Bonds, Senior Series A-1, 5.125% due 6/01/2047 1,464 500 Lammersville, California, School District, Special Tax Bonds (Community Facilities District Number 2002-- Mountain House), 5.125% due 9/01/2035 496 500 Roseville, California, Special Tax Bonds (Fiddyment Ranch Community Facilities Number 1), 5.25% due 9/01/2036 504 500 Temecula, California, Public Financing Authority, Community Facilities District Number 01-2, Special Tax Refunding Bonds, Sub-Series B, 5.10% due 9/01/2036 497 565 Temecula Valley, California, Unified School District, Community Facilities District Number 2005-1, Special Tax Bonds, 5% due 9/01/2036 553 Colorado--3.8% 750 Aspen Valley Hospital District, Colorado, Revenue Refunding Bonds, 5% due 10/15/2026 745 1,000 Colorado HFA, Revenue Refunding Bonds (Adventist Health System/Sunbelt Obligor Group), Series D, 5.25% due 11/15/2035 1,024 450 Colorado Health Facilities Authority, Revenue Refunding Bonds (Christian Living Communities Project), Series A, 5.75% due 1/01/2037 467 500 Sorrel Ranch Metropolitan District, Colorado, Limited Tax, GO, 5.75% due 12/01/2036 508 Connecticut--1.4% 1,000 Connecticut State Health and Educational Facilities Authority Revenue Bonds (University of Hartford), Series G, 5.25% due 7/01/2036 (h) 1,044 Florida--9.7% 605 Easton Park Community Development District, Florida, Capital Improvement Revenue Bonds, 5.20% due 5/01/2037 573 490 Highland Meadows Community Development District, Florida, Special Assessment Bonds, Series A, 5.50% due 5/01/2036 489 Face Amount Municipal Bonds Value Florida (concluded) $ 1,000 Hillsborough County, Florida, IDA, Hospital Revenue Bonds (Tampa General Hospital Project), 5.25% due 10/01/2041 $ 1,019 300 Jacksonville, Florida, Economic Development Commission, IDR (Gerdau Ameristeel US, Inc.), AMT, 5.30% due 5/01/2037 297 Lee County, Florida, IDA, Health Care Facilities, Revenue Refunding Bonds (Shell Point/Alliance Obligor Group): 500 5% due 11/15/2029 490 600 5% due 11/15/2032 586 570 Lee County, Florida, IDA, IDR (Lee Charter Foundation), Series A, 5.375% due 6/15/2037 560 500 New River Community Development District, Florida, Capital Improvement Revenue Bonds, Series B, 5% due 5/01/2013 493 1,000 Pine Ridge Plantation Community Development District, Florida, Capital Improvement and Special Assessment Bonds, Series B, 5% due 5/01/2011 992 500 Santa Rosa Bay Bridge Authority, Florida, Revenue Bonds, 6.25% due 7/01/2028 502 Sarosota County, Florida, Health Care Facilities Authority, Retirement Facility Revenue Refunding Bonds (Village on the Isle Project): 210 5.50% due 1/01/2027 214 190 5.50% due 1/01/2032 193 650 Watergrass Community Development District, Florida, Special Assessment Revenue Bonds, Series A, 5.375% due 5/01/2039 631 Georgia--2.9% 500 Brunswick and Glynn County, Georgia, Development Authority, First Mortgage Revenue Bonds (Coastal Community Retirement Corporation Project), Series A, 7.25% due 1/01/2035 397 180 Gainesville, Georgia, Redevelopment Authority, Educational Facilities Revenue Refunding Bonds (Riverside Military Academy), 5.125% due 3/01/2027 182 1,000 Richmond County, Georgia, Development Authority, Environmental Improvement Revenue Bonds (International Paper Co. Projects), AMT, Series A, 5% due 8/01/2030 1,000 555 Savannah, Georgia, EDA, First Mortgage Revenue Bonds (Marshes of Skidaway), Series B, 6% due 1/01/2034 549 Illinois--3.5% 1,000 Chicago, Illinois, O'Hare International Airport, Special Facility Revenue Refunding Bonds (American Airlines Inc. Project), 5.50% due 12/01/2030 995 1,000 Illinois Development Finance Authority, Solid Waste Disposal Revenue Bonds (Waste Management Inc. Project), VRDN, AMT, 5.05% due 1/01/2010 (j) 1,011 500 Illinois State Finance Authority Revenue Bonds (Three Crowns Park Plaza), Series A, 5.875% due 2/15/2038 521 Indiana--2.4% 700 Indiana Health and Educational Facilities Financing Authority, Hospital Revenue Bonds (Community Foundation of Northwest Indiana), 5.50% due 3/01/2037 709 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (continued) BlackRock High Yield Municipal Fund (In Thousands) Face Amount Municipal Bonds Value Indiana (concluded) Indiana Health Facilities Financing Authority, Hospital Revenue Refunding Bonds (Methodist Hospital, Inc.): $ 185 5.375% due 9/15/2022 $ 186 525 5.50% due 9/15/2031 529 Vigo County, Indiana, Hospital Authority Revenue Bonds (Union Hospital, Inc.): 155 5.70% due 9/01/2037 156 190 5.75% due 9/01/2042 191 Iowa--0.7% 500 Iowa Financing Authority, Health Facilities Revenue Refunding Bonds (Care Initiatives Project), Series A, 5% due 7/01/2019 496 Kansas--5.2% 1,350 Lenexa, Kansas, Health Care Facility, Revenue Refunding Bonds, 5.50% due 5/15/2039 1,374 1,000 Manhattan, Kansas, Health Care Facilities Revenue Bonds (Meadowlark Hills Retirement), Series B, 5.125% due 5/15/2042 967 990 Sedgwick and Shawnee Counties, Kansas, S/F Mortgage Revenue Bonds (Mortgage-Backed Securities Program), AMT, Series B-2, 5.25% due 12/01/2038 (b)(c) 1,018 450 Wyandotte County, Kansas, Kansas City Unified Government Revenue Refunding Bonds (General Motors Corporation Project), 6% due 6/01/2025 453 Kentucky--2.3% 1,725 Trimble County, Kentucky, Environmental Facilities Revenue Refunding Bonds, 4.60% due 6/01/2033 (a) 1,666 Maryland--3.9% 540 Baltimore, Maryland, Convention Center Hotel Revenue Bonds, Sub-Series B, 5.875% due 9/01/2039 569 500 Howard County, Maryland, Retirement Community Revenue Refunding Bonds (Columbia Vantage House Corporation), Series A, 5.25% due 4/01/2033 490 1,000 Maryland State Energy Financing Administration, Limited Obligation Revenue Bonds (Cogeneration- AES Warrior Run), AMT, 7.40% due 9/01/2019 1,006 Maryland State Health and Higher Educational Facilities Authority Revenue Bonds: 500 (King Farm Presbyterian Community), Series A, 5.30% due 1/01/2037 493 250 (Washington Christian Academy), 5.25% due 7/01/2018 251 Massachusetts--1.4% 390 Massachusetts State Development Finance Agency Revenue Bonds (Curry College), Series A, 5.25% due 3/01/2026 (e) 401 645 Massachusetts State Health and Educational Facilities Authority, Revenue Refunding Bonds (Bay Cove Human Services Issue), Series A, 5.90% due 4/01/2028 653 Michigan--0.4% 310 Garden City, Michigan, Hospital Finance Authority, Hospital Revenue Refunding Bonds (Garden City Hospital Obligation), Series A, 5% due 8/15/2038 287 Face Amount Municipal Bonds Value Missouri--0.5% Branson, Missouri, Regional Airport Transportation Development District, Airport Revenue Bonds: $ 250 AMT, Series B, 6% due 7/01/2037 $ 247 95 Series A, 6% due 7/01/2037 96 Nevada--1.3% 1,000 Clark County, Nevada, IDR (Southwest Gas Corp. Project), AMT, Series A, 4.75% due 9/01/2036 (f) 962 New Hampshire--3.6% New Hampshire Health and Education Facilities Authority, Revenue Refunding Bonds: 950 (Havenwood-Heritage Heights Retirement Community), Series A, 5.40% due 1/01/2030 950 1,015 (Southern New Hampshire University), 5% due 1/01/2027 (e) 1,028 650 New Hampshire State Business Financing Authority, Solid Waste Disposal Revenue Bonds (Waste Management Inc. Project), AMT, 5.20% due 5/01/2027 660 New Jersey--4.7% 1,000 New Jersey EDA, Retirement Community Revenue Refunding Bonds (Seabrook Village, Inc.), 5.25% due 11/15/2036 1,000 490 New Jersey EDA, Special Facility Revenue Bonds (Continental Airlines Inc. Project), AMT, 6.625% due 9/15/2012 517 650 New Jersey Health Care Facilities Financing Authority Revenue Bonds (Pascack Valley Hospital Association), 6.625% due 7/01/2036 576 1,000 New Jersey Health Care Facilities Financing Authority, Revenue Refunding Bonds (South Jersey Hospital System), 5% due 7/01/2046 996 385 Tobacco Settlement Financing Corporation of New Jersey, Revenue Refunding Bonds, Series 1A, 5% due 6/01/2041 363 New York--8.4% 500 Erie County, New York, IDA, Revenue Bonds (Orchard Park CCRC, Inc. Project), Series A, 6% due 11/15/2036 526 500 Genesee County, New York, IDA, Civic Facility Revenue Refunding Bonds (United Memorial Medical Center Project), 5% due 12/01/2032 480 1,000 Nassau County, New York, Tobacco Settlement Corporation, Senior Asset-Backed Revenue Refunding Bonds, Series A-3, 5% due 6/01/2035 1,005 750 New York City, New York, City IDA, Special Facility Revenue Bonds (JetBlue Airways Corporation Project), AMT, 5.125% due 5/15/2030 714 805 New York City, New York, GO, Sub-Series I-1, 5% due 4/01/2025 832 1,000 New York Liberty Development Corporation Revenue Bonds (National Sports Museum Project), Series A, 6.125% due 2/15/2019 1,038 1,000 New York State Dormitory Authority, Non-State Supported Debt, Revenue Refunding Bonds (New York University Hospital Center), Series A, 5% due 7/01/2026 1,002 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (continued) BlackRock High Yield Municipal Fund (In Thousands) Face Amount Municipal Bonds Value New York (concluded) $ 500 Onondaga County, New York, IDA, PCR (Anheuser- Busch Companies, Inc. Project), Refunding, Series A, 4.875% due 7/01/2041 $ 501 North Carolina--0.7% 500 North Carolina Medical Care Commission, Health Care Facilities, First Mortgage Revenue Refunding Bonds (Salemtowne Project), 5.10% due 10/01/2030 489 North Dakota--1.4% 1,000 Ward County, North Dakota, Health Care Facility Revenue Refunding Bonds (Trinity Health Obligated Group), 5.125% due 7/01/2029 1,002 Ohio--1.2% 875 Richland County, Ohio, Hospital Facilities Revenue Refunding Bonds (MedCentral Health System), 5.25% due 11/15/2036 896 Oklahoma--0.5% 355 Oklahoma State Development Finance Authority, Revenue Refunding Bonds (Saint John Health System), 5% due 2/15/2042 357 Pennsylvania--1.7% 735 Allegheny County, Pennsylvania, Hospital Development Authority, Health System Revenue Refunding Bonds (West Penn Allegheny Health System), Series A, 5.375% due 11/15/2040 730 500 Harrisburg, Pennsylvania, Authority, University Revenue Bonds (Harrisburg University of Science), Series B, 6% due 9/01/2036 515 Rhode Island--1.3% 1,000 Rhode Island Housing and Mortgage Finance Corporation, Homeownership Opportunity Revenue Bonds, AMT, Series 53-B, 5% due 10/01/2046 970 South Carolina--2.3% 1,000 Connector 2000 Association, Inc., South Carolina, Toll Road and Capital Appreciation Revenue Bonds, Senior Series B, 7.97% due 1/01/2015 (k) 554 500 Myrtle Beach, South Carolina, Tax Increment Revenue Bonds (Myrtle Beach Air Force Base), Series A, 5.25% due 11/01/2026 505 600 South Carolina Jobs, EDA, Health Care Facilities, First Mortgage Revenue Refunding Bonds (Luthern Homes), 5.50% due 5/01/2028 595 Tennessee--1.0% 700 Sullivan County, Tennessee, Health, Educational & Housing Facilities Board, Hospital Revenue Bonds (Wellmont Health System Project), Series C, 5.25% due 9/01/2036 711 Texas--9.1% Alliance Airport Authority, Inc., Texas, Special Facilities Revenue Refunding Bonds, AMT: 1,000 (American Airlines Inc. Project), 5.75% due 12/01/2029 997 500 (FedEx Corp. Project), 4.85% due 4/01/2021 493 Face Amount Municipal Bonds Value Texas (concluded) $ 500 Brazos River Authority, Texas, PCR (TXU Energy Company LLC Project), AMT, 5% due 3/01/2041 $ 463 500 Dallas, Texas, Industrial Development Corporation, IDR (CR/PL Inc. Project), VRDN, AMT, 7.50% due 8/01/2017 (j) 503 655 HFDC of Central Texas, Inc., Retirement Facilities Revenue Bonds, Series A, 5.75% due 11/01/2036 673 1,000 Harlandale, Texas, Independent School District, School Building, GO, 4.75% due 8/15/2040 982 500 Houston, Texas, Airport System, Special Facilities Revenue Bonds (Continental Airlines), AMT, Series E, 7.375% due 7/01/2022 545 1,000 Mission, Texas, Economic Development Corporation, Solid Waste Disposal Revenue Bonds (Allied Waste N.A. Inc Project), Series A, 5.20% due 4/01/2018 992 1,000 Texas State Public Financing Authority, Charter School Financing Corporation, Revenue Refunding Bonds (KIPP, Inc.), Series A, 5% due 2/15/2036 (e) 994 Utah--2.2% 1,640 Utah Housing Corporation, S/F Mortgage Revenue Bonds, AMT, Series A-1, Class I, 5% due 7/01/2037 1,620 Virginia--7.3% 1,150 Albermarle County, Virginia, IDA, Residential Care Facilities, Mortgage Revenue Refunding Bonds (Westminster-Canterbury), 5% due 1/01/2031 1,145 300 Fairfax County, Virginia, EDA, Residential Care Facilities, Mortgage Revenue Refunding Bonds (Goodwin House, Inc.), 5.125% due 10/01/2042 298 500 Fairfax County, Virginia, EDA, Retirement Revenue Refunding Bonds (Greenspring Village Inc.), Series A, 4.875% due 10/01/2036 485 500 Farms of New Kent, Virginia, Community Development Authority, Special Assessment Bonds, Series C, 5.80% due 3/01/2036 496 450 Henrico County, Virginia, EDA, Residential Care Facility, Mortgage Revenue Refunding Bonds (Westminster-Canterbury Of Winchester, Inc.), 5% due 10/01/2027 448 210 Lexington, Virginia, IDA, Residential Care Facility, Mortgage Revenue Refunding Bonds (Kendal at Lexington), Series A, 5.375% due 1/01/2028 209 750 Lynchburg, Virginia, IDA, Residential Care Facility, Mortgage Revenue Refunding Bonds (Westminster- Canterbury), 5% due 7/01/2031 733 500 Tobacco Settlement Financing Corporation of Virginia, Revenue Refunding Bonds, Senior Series B-1, 5% due 6/01/2047 478 1,000 Virginia State, HDA, Commonwealth Mortgage Revenue Bonds, Series H, Sub-Series H-1, 5.35% due 7/01/2031 (g) 1,023 Washington--0.8% 550 Washington State Housing Financing Commission, Nonprofit Revenue Bonds (Skyline at First Hill Project), Series A, 5.625% due 1/01/2038 556 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Schedule of Investments (concluded) BlackRock High Yield Municipal Fund (In Thousands) Face Amount Municipal Bonds Value Wisconsin--0.7% $ 500 Wisconsin State Health and Educational Facilities Authority, Revenue Refunding Bonds (Franciscan Sisters Healthcare), 5% due 9/01/2026 $ 494 Total Municipal Bonds (Cost--$70,574)--95.7% 69,641 Shares Held Mutual Funds Value 3,409 Merrill Lynch Institutional Tax-Exempt Fund, 3.59% (d)(i) $ 3,409 Total Mutual Funds (Cost--$3,409)--4.7% 3,409 Total Investments (Cost--$73,983*)--100.4% 73,050 Liabilities in Excess of Other Assets--(0.4%) (316) ------------ Net Assets--100.0% $ 72,734 ============ * The cost and unrealized appreciation (depreciation) of investments as of June 30, 2007, as computed for federal income tax purposes, were as follows: Aggregate cost $ 73,983 =============== Gross unrealized appreciation $ 219 Gross unrealized depreciation (1,152) --------------- Net unrealized depreciation $ (933) =============== (a) AMBAC Insured. (b) FHLMC Collateralized. (c) FNMA/GNMA Collateralized. (d) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: Net Dividend Affiliate Activity Income Merrill Lynch Institutional Tax-Exempt Fund 3,409 $69 (e) ACA Insured. (f) FGIC Insured. (g) MBIA Insured. (h) Radian Insured. (i) Represents the current yield as of June 30, 2007. (j) Security may have a maturity of more than one year at time of issuance, but has variable rate and demand features that qualify it as a short-term security. The rate disclosed is that currently in effect. This rate changes periodically based upon prevailing market rates. (k) Represents a zero coupon bond; the interest rate shown reflects the effective yield at the time of purchase. o Forward interest rate swaps outstanding as of June 30, 2007 were as follows: Notional Unrealized Amount Depreciation Pay a fixed rate of 4.034% and receive a floating rate based on a 1-week Bond Market Association Rate Broker, JPMorganChase Expires September 2017 $4,000 ($12) See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Statements of Assets and Liabilities BlackRock BlackRock BlackRock BlackRock Short-Term Municipal National High Yield Municipal Insured Municipal Municipal As of June 30, 2007 Fund Fund Fund Fund Assets Investments in unaffiliated securities, at value* $ 263,415,980 $ 962,457,182 $1,718,427,098 $ 69,641,240 Investments in affiliated securities, at value** 6,603,202 22,067,601 28,605,978 3,408,907 Unrealized appreciation on forward interest rate swaps -- 290,400 -- -- Cash 86,769 5,567 90,061 16,092 Receivables: Interest 4,283,317 13,735,627 26,171,544 1,014,921 Securities sold -- 8,497,250 19,570,038 1,003,633 Capital shares sold 408,464 1,093,615 7,255,342 167,848 Dividends from affiliates -- 72,439 -- -- Prepaid expenses and other assets 32,374 811,730 135,838 28,291 -------------- -------------- -------------- -------------- Total assets 274,830,106 1,009,031,411 1,800,255,899 75,280,932 -------------- -------------- -------------- -------------- Liabilities Trust certificates -- 109,775,745 151,796,404 -- Unrealized depreciation on forward interest rate swaps -- -- -- 12,232 Payables: Securities purchased -- 16,108,068 29,799,694 2,183,928 Dividends and distributions to shareholders 737,338 2,717,164 4,904,320 259,994 Capital shares redeemed 176,185 618,254 1,649,161 1,793 Interest expense -- 739,743 1,637,993 -- Investment adviser 37,248 272,508 644,232 20,349 Distributor 16,857 105,658 267,825 4,494 Other affiliates 28,754 68,771 205,986 2,896 Accrued expenses and other liabilities 114,874 172,421 383,682 61,079 -------------- -------------- -------------- -------------- Total liabilities 1,111,256 130,578,332 191,289,297 2,546,765 -------------- -------------- -------------- -------------- Net Assets Net assets $ 273,718,850 $ 878,453,079 $1,608,966,602 $ 72,734,167 ============== ============== ============== ============== Net Assets Consist of Undistributed investment income--net $ 484,004 $ 2,864,565 $ 984,199 $ 103,720 Undistributed (accumulated) realized capital gains (losses)--net (9,518,515) (3,215,488) (30,719,959) 152,050 Unrealized appreciation (depreciation)--net (516,004) 26,099,658 40,833,644 (945,506) -------------- -------------- -------------- -------------- Total accumulated earnings (losses)--net (9,550,515) 25,748,735 11,097,884 (689,736) -------------- -------------- -------------- -------------- BlackRock Common Stock, $.10 par value++ 24,845 -- -- -- Institutional Common Stock, $.10 par value++++ 1,326,491 7,880,571 9,397,924 626,857 Investor A Common Stock, $.10 par value++++++ 14,732 2,245,411 3,360,632 59,221 Investor A1 Common Stock, $.10 par value++++++++ 1,236,535 -- -- -- Investor B Common Stock, $.10 par value++++++++++ 145,525 593,822 975,269 -- Investor C Common Stock, $.10 par value++++++++++++ 21,091 59,147 401,009 43,932 Investor C1 Common Stock, $.10 par value++++++++++++++ -- 670,840 1,353,959 -- Paid-in capital in excess of par 280,500,146 841,254,553 1,582,379,925 72,693,893 -------------- -------------- -------------- -------------- Net Assets $ 273,718,850 $ 878,453,079 $1,608,966,602 $ 72,734,167 ============== ============== ============== ============== BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Statements of Assets and Liabilities (concluded) BlackRock BlackRock BlackRock BlackRock Short-Term Municipal National High Yield Municipal Insured Municipal Municipal As of June 30, 2007 Fund Fund Fund Fund Net Asset Value BlackRock: Net assets $ 2,456,503 -- -- -- ============== ============== ============== ============== Shares outstanding 248,454 -- -- -- ============== ============== ============== ============== Net asset value and redemption price per share $ 9.89 -- -- -- ============== ============== ============== ============== Institutional: Net assets $ 131,061,183 $ 604,691,001 $ 976,152,745 $ 62,463,874 ============== ============== ============== ============== Shares outstanding 13,264,906 78,805,707 93,979,240 6,268,568 ============== ============== ============== ============== Net asset value and redemption price per share $ 9.88 $ 7.67 $ 10.39 $ 9.96 ============== ============== ============== ============== Investor A: Net assets $ 1,456,122 $ 172,236,278 $ 349,224,922 $ 5,892,095 ============== ============== ============== ============== Shares outstanding 147,323 22,454,105 33,606,317 592,210 ============== ============== ============== ============== Net asset value and redemption price per share $ 9.88 $ 7.67 $ 10.39 $ 9.95 ============== ============== ============== ============== Investor A1: Net assets $ 122,280,627 -- -- -- ============== ============== ============== ============== Shares outstanding 12,365,352 -- -- -- ============== ============== ============== ============== Net asset value and redemption price per share $ 9.89 -- -- -- ============== ============== ============== ============== Investor B: Net assets $ 14,379,967 $ 45,532,659 $ 101,260,157 -- ============== ============== ============== ============== Shares outstanding 1,455,248 5,938,216 9,752,685 -- ============== ============== ============== ============== Net asset value and redemption price per share $ 9.88 $ 7.67 $ 10.38 -- ============== ============== ============== ============== Investor C: Net assets $ 2,084,448 $ 4,541,553 $ 41,675,770 $ 4,378,198 ============== ============== ============== ============== Shares outstanding 210,907 591,473 4,010,092 439,321 ============== ============== ============== ============== Net asset value and redemption price per share $ 9.88 $ 7.68 $ 10.39 $ 9.97 ============== ============== ============== ============== Investor C1: Net assets -- $ 51,451,588 $ 140,653,008 -- ============== ============== ============== ============== Shares outstanding -- 6,708,401 13,539,590 -- ============== ============== ============== ============== Net asset value and redemption price per share -- $ 7.67 $ 10.39 -- ============== ============== ============== ============== * Identified cost for unaffiliated securities $ 263,931,984 $ 934,352,012 $1,677,593,454 $ 70,574,514 ============== ============== ============== ============== ** Identified cost for affiliated securities $ 6,603,202 $ 24,363,513 $ 28,605,978 $ 3,408,907 ============== ============== ============== ============== ++ Authorized shares--BlackRock 150,000,000 -- -- -- ============== ============== ============== ============== ++++ Authorized shares--Institutional 150,000,000 500,000,000 375,000,000 100,000,000 ============== ============== ============== ============== ++++++ Authorized shares--Investor A 150,000,000 500,000,000 375,000,000 100,000,000 ============== ============== ============== ============== ++++++++ Authorized shares--Investor A1 150,000,000 -- -- -- ============== ============== ============== ============== ++++++++++ Authorized shares--Investor B 150,000,000 375,000,000 375,000,000 -- ============== ============== ============== ============== ++++++++++++ Authorized shares--Investor C 150,000,000 375,000,000 375,000,000 100,000,000 ============== ============== ============== ============== ++++++++++++++ Authorized shares--Investor C1 -- 375,000,000 375,000,000 -- ============== ============== ============== ============== See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Statements of Operations BlackRock BlackRock BlackRock BlackRock Short-Term Municipal National High Yield Municipal Insured Municipal Municipal For the Year Ended June 30, 2007 Fund Fund Fund Fund* Investment Income Interest $ 10,854,112 $ 47,525,276 $ 85,527,312 $ 2,349,629 Dividends from affiliates 313,945 1,225,484 1,477,049 68,615 -------------- -------------- -------------- -------------- Total income 11,168,057 48,750,760 87,004,361 2,418,244 -------------- -------------- -------------- -------------- Expenses Investment advisory fees 1,026,166 3,347,299 7,204,982 267,042 Interest expense and fees -- 3,703,919 6,157,425 -- Service and distribution fees--Investor C1 -- 458,943 1,199,779 -- Service and distribution fees--Investor B 62,980 419,919 891,062 -- Service fees--Investor A 1,547 435,341 796,475 4,434 Transfer agent fees--Institutional 65,041 226,781 613,731 2,727 Accounting services 113,979 279,890 444,852 17,606 Registration fees 46,404 60,719 146,546 7,189 Transfer agent fees--Investor A 2,360 73,540 175,277 526 Printing and shareholder reports 24,230 76,378 121,929 4,467 Professional fees 37,245 78,786 78,879 34,649 Service and distribution fees--Investor C 7,732 16,925 161,017 20,998 Custodian fees 28,138 52,960 78,500 5,857 Service fees--Investor A1 131,044 -- -- -- Transfer agent fees--Investor C1 -- 25,751 85,487 -- Transfer agent fees--Investor B 9,884 28,959 70,953 -- Pricing services 10,202 21,014 58,530 2,053 Directors' fees and expenses 7,149 18,826 28,628 1,067 Transfer agent fees--Investor A1 52,307 -- -- -- Service and distribution fees--Class C 33,491 -- -- -- Transfer agent fees--Investor C 4,804 1,235 17,552 808 Transfer agent fees--Class C 4,094 -- -- -- Transfer agent fees--BlackRock 658 -- -- -- Offering costs -- -- -- 101,990 Other 38,960 60,539 78,267 19,608 -------------- -------------- -------------- -------------- Total expenses before waiver 1,708,415 9,387,724 18,409,871 491,021 Waiver of expenses (299,590) (17,578) (85,262) (162,702) -------------- -------------- -------------- -------------- Total expenses after waiver 1,408,825 9,370,146 18,324,609 328,319 -------------- -------------- -------------- -------------- Investment income--net 9,759,232 39,380,614 68,679,752 2,089,925 -------------- -------------- -------------- -------------- Realized & Unrealized Gain (Loss)--Net Realized gain (loss) on: Investments--net (1,713,793) 1,576,951 9,192,129 15,609 Financial futures contracts and forward interest rate swaps--net -- (360,072) (475,176) 146,746 -------------- -------------- -------------- -------------- Total realized gain (loss)--net (1,713,793) 1,216,879 8,716,953 162,355 -------------- -------------- -------------- -------------- Change in unrealized appreciation/depreciation on: Investments--net 1,804,264 1,426,556 (7,313,633) (933,274) Forward interest rate swaps--net -- 290,400 -- (12,232) -------------- -------------- -------------- -------------- Total change in unrealized appreciation/depreciation--net 1,804,264 1,716,956 (7,313,633) (945,506) -------------- -------------- -------------- -------------- Total realized and unrealized gain (loss)--net 90,471 2,933,835 1,403,320 (783,151) -------------- -------------- -------------- -------------- Net Increase in Net Assets Resulting from Operations $ 9,849,703 $ 42,314,449 $ 70,083,072 $ 1,306,774 ============== ============== ============== ============== * Fund commenced operations on August 1, 2006. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Statements of Changes in Net Assets BlackRock Short-Term Municipal Fund For the Year Ended June 30, Increase (Decrease) in Net Assets: 2007 2006 Operations Investment income--net $ 9,759,232 $ 9,982,288 Realized loss--net (1,713,793) (2,592,944) Change in unrealized appreciation/depreciation--net 1,804,264 (1,927,943) -------------- -------------- Net increase in net assets resulting from operations 9,849,703 5,461,401 -------------- -------------- Dividends to Shareholders Investment income--net: BlackRock (140,524) -- Institutional (4,626,244) (4,454,151) Investor A (19,319) -- Investor A1 (4,174,606) (3,080,084) Investor B (522,656) (696,530) Investor C (18,188) -- Class C (257,695) (1,751,261) -------------- -------------- Net decrease in net assets resulting from dividends to shareholders (9,759,232) (9,982,026) -------------- -------------- Capital Share Transactions Net decrease in net assets derived from capital share transactions (62,634,810) (118,737,525) -------------- -------------- Net Assets Total decrease in net assets (62,544,339) (123,258,150) Beginning of year 336,263,189 459,521,339 -------------- -------------- End of year* $ 273,718,850 $ 336,263,189 ============== ============== * Undistributed investment income--net $ 484,004 $ 484,004 ============== ============== See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Statements of Changes in Net Assets BlackRock Municipal Insured Fund For the Year Ended June 30, Increase (Decrease) in Net Assets: 2007 2006 Operations Investment income--net $ 39,380,614 $ 42,545,175 Realized gain--net 1,216,879 6,736,805 Change in unrealized appreciation/depreciation--net 1,716,956 (43,062,066) -------------- -------------- Net increase in net assets resulting from operations 42,314,449 6,219,914 -------------- -------------- Dividends & Distributions to Shareholders Investment income--net: Institutional (26,786,243) (29,830,404) Investor A (6,958,170) (7,533,857) Investor B (1,954,906) (2,879,619) Investor C (53,001) -- Investor C1 (1,973,504) (2,276,067) Realized gain--net: Institutional (3,420,292) (2,535,229) Investor A (945,702) (682,505) Investor B (299,416) (295,880) Investor C (6,273) -- Investor C1 (312,142) (235,289) -------------- -------------- Net decrease in net assets resulting from dividends and distributions to shareholders (42,709,649) (46,268,850) -------------- -------------- Capital Share Transactions Net decrease in net assets derived from capital share transactions (60,444,977) (66,044,701) -------------- -------------- Net Assets Total decrease in net assets (60,840,177) (106,093,637) Beginning of year 939,293,256 1,045,386,893 -------------- -------------- End of year* $ 878,453,079 $ 939,293,256 ============== ============== * Undistributed investment income--net $ 2,864,565 $ 1,209,976 ============== ============== See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Statements of Changes in Net Assets BlackRock National Municipal Fund For the Year Ended June 30, Increase (Decrease) in Net Assets: 2007 2006 Operations Investment income--net $ 68,679,752 $ 67,217,185 Realized gain--net 8,716,953 12,238,185 Change in unrealized appreciation--net (7,313,633) (53,182,340) -------------- -------------- Net increase in net assets resulting from operations 70,083,072 26,273,030 -------------- -------------- Dividends to Shareholders Investment income--net: Institutional (43,499,106) (43,778,940) Investor A (14,096,416) (11,906,520) Investor B (4,665,176) (6,469,017) Investor C (572,654) -- Investor C1 (5,809,148) (4,988,554) -------------- -------------- Net decrease in net assets resulting from dividends to shareholders (68,642,500) (67,143,031) -------------- -------------- Capital Share Transactions Net increase in net assets derived from capital share transactions 159,104,907 46,489,740 -------------- -------------- Net Assets Total increase in net assets 160,545,479 5,619,739 Beginning of year 1,448,421,123 1,442,801,384 -------------- -------------- End of year* $1,608,966,602 $1,448,421,123 ============== ============== * Undistributed investment income--net $ 984,199 $ 946,947 ============== ============== See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Statement of Changes in Net Assets BlackRock High Yield Municipal Fund For the Period August 1, 2006++ Increase (Decrease) in Net Assets: to June 30, 2007 Operations Investment income--net $ 2,089,925 Realized gain--net 162,355 Change in unrealized depreciation--net (945,506) -------------- Net increase in net assets resulting from operations 1,306,774 -------------- Dividends & Distributions to Shareholders Investment income--net: Institutional (1,933,439) Investor A (73,543) Investor C (82,943) Realized gain--net: Institutional (9,444) Investor A (407) Investor C (454) -------------- Net decrease in net assets resulting from dividends and distributions to shareholders (2,100,230) -------------- Capital Share Transactions Net increase in net assets derived from capital share transactions 73,526,873 -------------- Net Assets Total increase in net assets 72,733,417 Beginning of period 750 -------------- End of period* $ 72,734,167 ============== * Undistributed investment income--net $ 103,720 ============== ++ Commencement of operations. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Financial Highlights BlackRock Short-Term Municipal Fund BlackRock For the Period October 2, 2006++ The following per share data and ratios have been derived to June 30, from information provided in the financial statements. 2007 Per Share Operating Performance Net asset value, beginning of period $ 9.93 -------------- Investment income--net** .25 Realized and unrealized loss--net (.04) -------------- Total from investment operations .21 -------------- Less dividends from investment income--net (.25) -------------- Net asset value, end of period $ 9.89 ============== Total Investment Return Based on net asset value per share 2.09%+++ ============== Ratios to Average Net Assets Expenses, net of waiver .35%* ============== Expenses .45%* ============== Investment income--net 3.34%* ============== Supplemental Data Net assets, end of period (in thousands) $ 2,457 ============== Portfolio turnover 110% ============== * Annualized. ** Based on average shares outstanding. ++ Commencement of operations. +++ Aggregate total investment return. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Financial Highlights (continued) BlackRock Short-Term Municipal Fund Investor A For the Period The following per share data Institutional October 2, and ratios have been derived 2006++ to from information provided in For the Year Ended June 30, June 30, the financial statements. 2007 2006 2005 2004 2003 2007 Per Share Operating Performance Net asset value, beginning of period $ 9.88 $ 9.99 $ 10.05 $ 10.17 $ 10.13 $ 9.93 ---------- ---------- ---------- ---------- ---------- ---------- Investment income--net*** .32 .27 .19 .18 .27 .23 Realized and unrealized gain (loss)--net --+++++ (.11) (.06) (.12) .02 (.05) ---------- ---------- ---------- ---------- ---------- ---------- Total from investment operations .32 .16 .13 .06 .29 .18 ---------- ---------- ---------- ---------- ---------- ---------- Less dividends from investment income--net (.32) (.27) (.19) (.18) (.25) (.23) ---------- ---------- ---------- ---------- ---------- ---------- Net asset value, end of period $ 9.88 $ 9.88 $ 9.99 $ 10.05 $ 10.17 $ 9.88 ========== ========== ========== ========== ========== ========== Total Investment Return** Based on net asset value per share 3.32% 1.57% 1.30% .59% 2.87% 1.79%+++ ========== ========== ========== ========== ========== ========== Ratios to Average Net Assets Expenses, net of waiver .38% .44% .43% .42% .42% .61%* ========== ========== ========== ========== ========== ========== Expenses .48% .45% .44% .43% .43% 1.06%* ========== ========== ========== ========== ========== ========== Investment income--net 3.27% 2.66% 1.88% 1.78% 2.44% 3.12%* ========== ========== ========== ========== ========== ========== Supplemental Data Net assets, end of period (in thousands) $ 131,061 $ 149,333 $ 186,877 $ 243,443 $ 251,137 $ 1,456 ========== ========== ========== ========== ========== ========== Portfolio turnover 110% 83% 87% 69% 45% 110% ========== ========== ========== ========== ========== ========== * Annualized. ** Total investment returns exclude the effects of any sales charges. *** Based on average shares outstanding. ++ Commencement of operations. +++ Aggregate total investment return. +++++ Amount is less than $.01 per share. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Financial Highlights (continued) BlackRock Short-Term Municipal Fund The following per share data and ratios have been Investor A1 Investor B derived from information provided in For the Year Ended June 30, For the Year Ended June 30, the financial statements. 2007 2006 2005 2004 2003 2007 2006 2005 2004 2003 Per Share Operating Performance Net asset value, beginning of year $ 9.89 $ 10.00 $ 10.06 $ 10.18 $ 10.14 $ 9.88 $ 10.00 $ 10.05 $ 10.17 $ 10.13 ------------------------------------------------- ------------------------------------------------- Investment income--net** .32 .26 .18 .17 .24 .29 .23 .15 .14 .21 Realized and unrealized gain (loss)--net (.01) (.11) (.06) (.12) .04 --+++ (.12) (.05) (.12) .04 ------------------------------------------------- ------------------------------------------------- Total from investment operations .31 .15 .12 .05 .28 .29 .11 .10 .02 .25 ------------------------------------------------- ------------------------------------------------- Less dividends from investment income--net (.31) (.26) (.18) (.17) (.24) (.29) (.23) (.15) (.14) (.21) ------------------------------------------------- ------------------------------------------------- Net asset value, end of year $ 9.89 $ 9.89 $ 10.00 $ 10.06 $ 10.18 $ 9.88 $ 9.88 $ 10.00 $ 10.05 $ 10.17 ================================================= ================================================= Total Investment Return* Based on net asset value per share 3.21% 1.47% 1.20% .50% 2.77% 2.95% 1.11% 1.04% .24% 2.51% ================================================= ================================================= Ratios to Average Net Assets Expenses, net of waiver .48% .54% .53% .52% .52% .74% .80% .79% .77% .78% ================================================= ================================================= Expenses .58% .55% .54% .53% .53% .85% .81% .80% .78% .79% ================================================= ================================================= Investment income--net 3.18% 2.55% 1.76% 1.68% 2.31% 2.90% 2.28% 1.50% 1.43% 2.10% ================================================= ================================================= Supplemental Data Net assets, end of year (in thousands) $122,281 $ 99,293 $141,172 $244,741 $248,454 $ 14,380 $ 23,769 $ 38,565 $ 63,135 $ 83,886 ================================================= ================================================= Portfolio turnover 110% 83% 87% 69% 45% 110% 83% 87% 69% 45% ================================================= ================================================= * Total investment returns exclude the effects of sales charges. ** Based on average shares outstanding. +++ Amount is less than $(.01) per share. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Financial Highlights (continued) BlackRock Short-Term Municipal Fund Investor C For the Period October 2, 2006++ The following per share data and ratios have been derived to June 30, from information provided in the financial statements. 2007 Per Share Operating Performance Net asset value, beginning of period $ 9.93 -------------- Investment income--net*** .17 Realized and unrealized loss--net (.05) -------------- Total from investment operations .12 -------------- Less dividends from investment income--net (.17) -------------- Net asset value, end of period $ 9.88 ============== Total Investment Return** Based on net asset value per share 1.23%+++ ============== Ratios to Average Net Assets Expenses, net of waiver 1.36%* ============== Expenses 2.06%* ============== Investment income--net 2.37%* ============== Supplemental Data Net assets, end of period (in thousands) $ 2,084 ============== Portfolio turnover 110% ============== * Annualized. ** Total investment returns exclude the effects of sales charges. *** Based on average shares outstanding. ++ Commencement of operations. +++ Aggregate total investment return. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Financial Highlights (continued) BlackRock Municipal Insured Fund The following per share data and ratios have been Institutional Investor A derived from information provided in For the Year Ended June 30, For the Year Ended June 30, the financial statements. 2007 2006 2005 2004 2003 2007 2006 2005 2004 2003 Per Share Operating Performance Net asset value, beginning of year $ 7.69 $ 8.00 $ 7.70 $ 8.07 $ 7.80 $ 7.68 $ 8.00 $ 7.70 $ 8.07 $ 7.79 ------------------------------------------------- ------------------------------------------------- Investment income--net** .32 .35 .36 .40 .41 .33 .33 .34 .38 .39 Realized and unrealized gain (loss)--net .03 (.28) .30 (.37) .27 .01 (.29) .30 (.37) .28 ------------------------------------------------- ------------------------------------------------- Total from investment operations .35 .07 .66 .03 .68 .34 .04 .64 .01 .67 ------------------------------------------------- ------------------------------------------------- Less dividends and distributions: Investment income--net (.33) (.35) (.36) (.40) (.41) (.31) (.33) (.34) (.38) (.39) Realized gain--net (.04) (.03) -- -- -- (.04) (.03) -- -- -- ------------------------------------------------- ------------------------------------------------- Total dividends and distributions (.37) (.38) (.36) (.40) (.41) (.35) (.36) (.34) (.38) (.39) ------------------------------------------------- ------------------------------------------------- Net asset value, end of year $ 7.67 $ 7.69 $ 8.00 $ 7.70 $ 8.07 $ 7.67 $ 7.68 $ 8.00 $ 7.70 $ 8.07 ================================================= ================================================= Total Investment Return* Based on net asset value per share 4.60% .82% 8.74% .35% 8.88% 4.47% .44% 8.47% .10% 8.77% ================================================= ================================================= Ratios to Average Net Assets Expenses, net of waiver and excluding interest expense .47% .45% .46% .46% .46% .72% .70% .71% .71% .71% ================================================= ================================================= Expenses, net of waiver .87% .74% .63% .66% .71% 1.12% .99% .88% .91% .96% ================================================= ================================================= Expenses .87% .74% .64% .67% .71% 1.13% .99% .89% .91% .96% ================================================= ================================================= Investment income--net 4.42% 4.40% 4.58% 5.04% 5.13% 4.17% 4.15% 4.33% 4.79% 4.88% ================================================= ================================================= Supplemental Data Net assets, end of year (in thousands) $604,691 $639,687 $707,134 $733,310 $855,757 $172,236 $172,083 $182,216 $183,007 $187,805 ================================================= ================================================= Portfolio turnover 36% 41% 47% 44% 33% 36% 41% 47% 44% 33% ================================================= ================================================= * Total investment returns exclude the effects of any sales charges. ** Based on average shares outstanding. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Financial Highlights (continued) BlackRock Municipal Insured Fund Investor B The following per share data and ratios have been derived For the Year Ended June 30, from information provided in the financial statements. 2007 2006 2005 2004 2003 Per Share Operating Performance Net asset value, beginning of year $ 7.68 $ 7.99 $ 7.69 $ 8.07 $ 7.79 ----------- ----------- ----------- ----------- ----------- Investment income--net** .29 .29 .30 .34 .35 Realized and unrealized gain (loss)--net .01 (.28) .30 (.38) .28 ----------- ----------- ----------- ----------- ----------- Total from investment operations .30 .01 .60 (.04) .63 ----------- ----------- ----------- ----------- ----------- Less dividends and distributions: Investment income--net (.27) (.29) (.30) (.34) (.35) Realized gain--net (.04) (.03) -- -- -- ----------- ----------- ----------- ----------- ----------- Total dividends and distributions (.31) (.32) (.30) (.34) (.35) ----------- ----------- ----------- ----------- ----------- Net asset value, end of year $ 7.67 $ 7.68 $ 7.99 $ 7.69 $ 8.07 =========== =========== =========== =========== =========== Total Investment Return* Based on net asset value per share 3.95% .05% 7.93% (.53%) 8.21% =========== =========== =========== =========== =========== Ratios to Average Net Assets Expenses, net of waiver and excluding interest expense 1.23% 1.21% 1.21% 1.21% 1.22% =========== =========== =========== =========== =========== Expenses, net of waiver 1.63% 1.50% 1.39% 1.42% 1.47% =========== =========== =========== =========== =========== Expenses 1.63% 1.50% 1.40% 1.42% 1.47% =========== =========== =========== =========== =========== Investment income--net 3.67% 3.64% 3.83% 4.29% 4.38% =========== =========== =========== =========== =========== Supplemental Data Net assets, end of year (in thousands) $ 45,533 $ 66,477 $ 91,355 $ 111,524 $ 160,177 =========== =========== =========== =========== =========== Portfolio turnover 36% 41% 47% 44% 33% =========== =========== =========== =========== =========== * Total investment returns exclude the effects of sales charges. ** Based on average shares outstanding. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Financial Highlights (continued) BlackRock Municipal Insured Fund Investor C For the Period October 2, Investor C1 The following per share data and ratios 2006++ to have been derived from information June 30, For the Year Ended June 30, provided in the financial statements. 2007 2007 2006 2005 2004 2003 Per Share Operating Performance Net asset value, beginning of period $ 7.88 $ 7.68 $ 8.00 $ 7.69 $ 8.07 $ 7.79 ----------- ----------- ----------- ----------- ----------- ----------- Investment income--net*** .17 .28 .28 .30 .33 .34 Realized and unrealized gain (loss)--net (.14) .02 (.29) .31 (.38) .28 ----------- ----------- ----------- ----------- ----------- ----------- Total from investment operations .03 .30 (.01) .61 (.05) .62 ----------- ----------- ----------- ----------- ----------- ----------- Less dividends and distributions: Investment income--net (.19) (.27) (.28) (.30) (.33) (.34) Realized gain--net (.04) (.04) (.03) -- -- -- ----------- ----------- ----------- ----------- ----------- ----------- Total dividends and distributions (.23) (.31) (.31) (.30) (.33) (.34) ----------- ----------- ----------- ----------- ----------- ----------- Net asset value, end of period $ 7.68 $ 7.67 $ 7.68 $ 8.00 $ 7.69 $ 8.07 =========== =========== =========== =========== =========== =========== Total Investment Return** Based on net asset value per share .34%+++ 3.90% (.12%) 8.01% (.58%) 8.16% =========== =========== =========== =========== =========== =========== Ratios to Average Net Assets Expenses, net of waiver and excluding interest expense 1.51%* 1.28% 1.26% 1.26% 1.26% 1.27% =========== =========== =========== =========== =========== =========== Expenses, net of waiver 1.90%* 1.68% 1.55% 1.44% 1.47% 1.52% =========== =========== =========== =========== =========== =========== Expenses 1.90%* 1.68% 1.55% 1.45% 1.47% 1.52% =========== =========== =========== =========== =========== =========== Investment income--net 3.37%* 3.63% 3.59% 3.77% 4.23% 4.31% =========== =========== =========== =========== =========== =========== Supplemental Data Net assets, end of period (in thousands) $ 4,542 $ 51,452 $ 61,046 $ 64,682 $ 61,794 $ 66,089 =========== =========== =========== =========== =========== =========== Portfolio turnover 36% 36% 41% 47% 44% 33% =========== =========== =========== =========== =========== =========== * Annualized. ** Total investment returns exclude the effects of sales charges. *** Based on average shares outstanding. ++ Commencement of operations. +++ Aggregate total investment return. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Financial Highlights (continued) BlackRock National Municipal Fund The following per share data and ratios have been Institutional Investor A derived from information provided in For the Year Ended June 30, For the Year Ended June 30, the financial statements. 2007 2006 2005 2004 2003 2007 2006 2005 2004 2003 Per Share Operating Performance Net asset value, beginning of year $ 10.36 $ 10.66 $ 10.29 $ 10.54 $ 10.26 $ 10.37 $ 10.67 $ 10.29 $ 10.54 $ 10.27 ------------------------------------------------- ------------------------------------------------- Investment income--net** .49 .51 .53 .55 .56 .46 .49 .50 .52 .53 Realized and unrealized gain (loss)--net .05 (.30) .37 (.25) .28 .03 (.30) .38 (.25) .27 ------------------------------------------------- ------------------------------------------------- Total from investment operations .54 .21 .90 .30 .84 .49 .19 .88 .27 .80 ------------------------------------------------- ------------------------------------------------- Less dividends from investment income--net (.51) (.51) (.53) (.55) (.56) (.47) (.49) (.50) (.52) (.53) ------------------------------------------------- ------------------------------------------------- Net asset value, end of year $ 10.39 $ 10.36 $ 10.66 $ 10.29 $ 10.54 $ 10.39 $ 10.37 $ 10.67 $ 10.29 $ 10.54 ================================================= ================================================= Total Investment Return* Based on net asset value per share 5.06% 2.02% 8.89% 2.88% 8.34% 4.71% 1.77% 8.73% 2.62% 7.98% ================================================= ================================================= Ratios to Average Net Assets Expenses, net of waiver and excluding interest expense .59% .58% .59% .60% .59% .84% .83% .84% .85% .84% ================================================= ================================================= Expenses, net of waiver .99% .84% .72% .70% .75% 1.24% 1.09% .97% .95% 1.00% ================================================= ================================================= Expenses 1.00% .85% .72% .70% .75% 1.24% 1.10% .97% .95% 1.00% ================================================= ================================================= Investment income--net 4.66% 4.87% 5.02% 5.23% 5.35% 4.43% 4.61% 4.76% 4.97% 5.10% ================================================= ================================================= Supplemental Data Net assets, end of year (in thousands) $976,153 $890,984 $909,125 $907,419 $624,192 $349,225 $283,814 $248,231 $207,376 $200,108 ================================================= ================================================= Portfolio turnover 46% 56% 33% 20% 34% 46% 56% 33% 20% 34% ================================================= ================================================= * Total investment returns exclude the effects of any sales charges. ** Based on average shares outstanding. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Financial Highlights (continued) BlackRock National Municipal Fund Investor B The following per share data and ratios have been derived For the Year Ended June 30, from information provided in the financial statements. 2007 2006 2005 2004 2003 Per Share Operating Performance Net asset value, beginning of year $ 10.36 $ 10.66 $ 10.28 $ 10.53 $ 10.26 ----------- ----------- ----------- ----------- ----------- Investment income--net** .41 .43 .45 .47 .48 Realized and unrealized gain (loss)--net .02 (.30) .38 (.26) .27 ----------- ----------- ----------- ----------- ----------- Total from investment operations .43 .13 .83 .21 .75 ----------- ----------- ----------- ----------- ----------- Less dividends from investment income--net (.41) (.43) (.45) (.46) (.48) ----------- ----------- ----------- ----------- ----------- Net asset value, end of year $ 10.38 $ 10.36 $ 10.66 $ 10.28 $ 10.53 =========== =========== =========== =========== =========== Total Investment Return* Based on net asset value per share 4.18% 1.25% 8.18% 2.10% 7.43% =========== =========== =========== =========== =========== Ratios to Average Net Assets Expenses, net of waiver and excluding interest expense 1.34% 1.34% 1.35% 1.35% 1.34% =========== =========== =========== =========== =========== Expenses, net of waiver 1.75% 1.60% 1.48% 1.45% 1.50% =========== =========== =========== =========== =========== Expenses 1.75% 1.61% 1.48% 1.46% 1.51% =========== =========== =========== =========== =========== Investment income--net 3.92% 4.11% 4.27% 4.47% 4.59% =========== =========== =========== =========== =========== Supplemental Data Net assets, end of year (in thousands) $ 101,260 $ 134,177 $ 177,553 $ 217,814 $ 321,477 =========== =========== =========== =========== =========== Portfolio turnover 46% 56% 33% 20% 34% =========== =========== =========== =========== =========== * Total investment returns exclude the effects of sales charges. ** Based on average shares outstanding. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Financial Highlights (continued) BlackRock National Municipal Fund Investor C For the Period October 2, Investor C1 The following per share data and ratios 2006++ to have been derived from information June 30, For the Year Ended June 30, provided in the financial statements. 2007 2007 2006 2005 2004 2003 Per Share Operating Performance Net asset value, beginning of period $ 10.57 $ 10.36 $ 10.66 $ 10.29 $ 10.54 $ 10.26 ----------- ----------- ----------- ----------- ----------- ----------- Investment income--net*** .25 .41 .43 .44 .46 .47 Realized and unrealized gain (loss)--net (.16) .04 (.29) .37 (.25) .28 ----------- ----------- ----------- ----------- ----------- ----------- Total from investment operations .09 .45 .14 .81 .21 .75 ----------- ----------- ----------- ----------- ----------- ----------- Less dividends from investment income--net (.27) (.42) (.44) (.44) (.46) (.47) ----------- ----------- ----------- ----------- ----------- ----------- Net asset value, end of period $ 10.39 $ 10.39 $ 10.36 $ 10.66 $ 10.29 $ 10.54 =========== =========== =========== =========== =========== =========== Total Investment Return** Based on net asset value per share .96%++++ 4.23% 1.20% 8.02% 2.05% 7.48% =========== =========== =========== =========== =========== =========== Ratios to Average Net Assets Expenses, net of waiver and excluding interest expense 1.65%* 1.39% 1.39% 1.40% 1.40% 1.39% =========== =========== =========== =========== =========== =========== Expenses, net of waiver 2.05%* 1.80% 1.65% 1.53% 1.50% 1.55% =========== =========== =========== =========== =========== =========== Expenses 2.05%* 1.80% 1.65% 1.53% 1.51% 1.56% =========== =========== =========== =========== =========== =========== Investment income--net 3.59%* 3.88% 4.05% 4.20% 4.42% 4.54% =========== =========== =========== =========== =========== =========== Supplemental Data Net assets, end of period (in thousands) $ 41,676 $ 140,653 $ 139,447 $ 107,893 $ 74,849 $ 77,906 =========== =========== =========== =========== =========== =========== Portfolio turnover 46% 46% 56% 33% 20% 34% =========== =========== =========== =========== =========== =========== * Annualized. ** Total investment returns exclude the effects of sales charges. *** Based on average shares outstanding. ++ Commencement of operations. ++++ Aggregate total investment return. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Financial Highlights (concluded) BlackRock High Yield Municipal Fund For the Period August 1, 2006++ The following per share data and ratios have been derived to June 30, 2007 from information provided in the financial statements. Institutional Investor A Investor C Per Share Operating Performance Net asset value, beginning of period $ 10.00 $ 10.00 $ 10.00 ----------- ----------- ----------- Investment income--net*** .39 .32 .30 Realized and unrealized gain (loss)--net (.03) .01 (.02) ----------- ----------- ----------- Total from investment operations .36 .33 .28 ----------- ----------- ----------- Less dividends and distributions: Investment income--net (.40) (.38) (.31) Realized gain--net --+++++ --+++++ --+++++ ----------- ----------- ----------- Total dividends and distributions (.40) (.38) (.31) ----------- ----------- ----------- Net asset value, end of period $ 9.96 $ 9.95 $ 9.97 =========== =========== =========== Total Investment Return** Based on net asset value per share 3.59%+++ 3.26%+++ 2.84%+++ =========== =========== =========== Ratios to Average Net Assets Expenses, net of waiver .62%* .89%* 1.53%* =========== =========== =========== Expenses .96%* 1.19%* 1.84%* =========== =========== =========== Investment income--net 4.35%* 4.16%* 3.50%* =========== =========== =========== Supplemental Data Net assets, end of period (in thousands) $ 62,464 $ 5,892 $ 4,378 =========== =========== =========== Portfolio turnover 16% 16% 16% =========== =========== =========== * Annualized. ** Total investment returns exclude the effects of sales charges. *** Based on average shares outstanding. ++ Commencement of operations. +++ Aggregate total investment return. +++++ Amount is less than $(.01) per share. See Notes to Financial Statements. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Notes to Financial Statements 1. Significant Accounting Policies: On September 29, 2006, Merrill Lynch Municipal Bond Fund, Inc. (consisting of Merrill Lynch Short-Term Portfolio, Merrill Lynch Insured Portfolio, Merrill Lynch National Portfolio and Merrill Lynch High Yield Portfolio) was renamed BlackRock Municipal Bond Fund, Inc. (the "Bond Fund"), consisting of BlackRock Short-Term Municipal Fund, BlackRock Municipal Insured Fund, BlackRock National Municipal Fund and BlackRock High Yield Municipal Fund (the "Funds" or individually as the "Fund"), respectively. The Bond Fund is registered under the Investment Company Act of 1940, as amended, as a diversified, open- end management investment company. For the BlackRock High Yield Municipal Fund, prior to the commencement of operations on August 1, 2006, the Fund had no operations other than those relating to organizational matters and the issuance of 75 shares of Common Stock of the Fund on July 10, 2006 to Fund Asset Management, L.P. ("FAM") for $750. The Bond Fund's financial statements are prepared in conformity with U.S. generally accepted accounting principles, which may require the use of management accruals and estimates. Actual results may differ from these estimates. The Funds offer multiple classes of shares. Effective October 2, 2006, BlackRock Short-Term Municipal Fund's Class A, Class B and Class I Shares were redesignated Investor A1, Investor B and Institutional Shares, respectively. All Class C Shares of the BlackRock Short- Term Municipal Fund converted to Class A (now Investor A1) Shares on August 25, 2006 and are no longer outstanding. BlackRock Municipal Insured Fund's and BlackRock National Municipal Fund's Class A, Class B, Class C and Class I Shares were redesignated Investor A, Investor B, Investor C1 and Institutional Shares, respectively. BlackRock High Yield Municipal Fund's Class A, Class C and Class I Shares were redesignated Investor A, Investor C and Institutional Shares, respectively. Also, effective October 2, 2006 BlackRock Short-Term Municipal Fund's BlackRock Shares, Investor A Shares and Investor C Shares commenced operations and BlackRock Municipal Insured Fund's and BlackRock National Municipal Fund's Investor C Shares commenced operations. BlackRock and Institutional Shares are sold only to certain eligible investors. Investor A and Investor A1 Shares are sold with a front-end sales charge. Shares of Investor B, Investor C and Investor C1 may be subject to a contingent deferred sales charge. All classes of shares have identical voting, dividend, liquidation and other rights and the same terms and conditions, except that Investor A, Investor A1, Investor B, Investor C and Investor C1 Shares bear certain expenses related to the shareholder servicing of such shares, and Investor B, Investor C and Investor C1 Shares also bear certain expenses related to the distribution of such shares. Each class has exclusive voting rights with respect to matters relating to its shareholder servicing and distribution expenditures (except that Investor B share-holders may vote on certain changes to the Investor A and Investor A1 distribution plan, as applicable). Income, expenses (other than expenses attributable to a specific class) and realized and unrealized gains and losses are allocated daily to each class based on its relative net assets. The following is a summary of significant accounting policies followed by the Bond Fund. (a) Valuation of investments--Municipal bonds are traded primarily in the over- the-counter ("OTC") markets and are valued at the last available bid price in the OTC market or on the basis of values as obtained by a pricing service. Pricing services use valuation matrixes that incorporate both dealer-supplied valuations and valuation models. The procedures of the pricing service and its valuations are reviewed by the officers of the Bond Fund under the general direction of the Board of Directors. Such valuations and procedures are reviewed periodically by the Board of Directors of the Bond Fund. Financial futures contracts and options thereon, which are traded on exchanges, are valued at their closing prices as of the close of such exchanges. Options written or purchased are valued at the last sale price in the case of exchange- traded options. Options traded in the OTC market are valued at the last asked price (options written) or the last bid price (options purchased). Swap agreements are valued based upon quoted fair valuations received daily by the Bond Fund from a pricing service. Effective April 2, 2007, short-term investments are valued at amortized cost, which approximates market value. Prior to April 2, 2007, portfolio securities with remaining maturities of greater than sixty days, for which market quotations were readily available, were valued at market value. As securities transitioned from sixty-one to sixty days to maturity, the difference between the valuation existing on the sixty-first day before maturity and maturity value was amortized on a straight- line basis to maturity. Investments in open-end investment companies are valued at their net asset value each business day. Securities and other assets for which market quotations are not readily available are valued at fair value as determined in good faith by or under the direction of the Board of Directors of the Bond Fund. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Notes to Financial Statements (continued) (b) Derivative financial instruments--The Funds may engage in various portfolio investment strategies both to increase their returns and to hedge, or protect, their exposure to interest rate movements and movements in the securities markets. Losses may arise due to changes in the value of the contract due to an unfavorable change in the price of the underlying security, or index, or if the counterparty does not perform under the contract. The counterparty for certain instruments may pledge cash or securities as collateral. * Financial futures contracts--The Funds may purchase or sell financial futures contracts and options on such financial futures contracts. Financial futures contracts are contracts for delayed delivery of securities at a specific future date and at a specific price or yields. Upon entering into a contract, the Funds deposit and maintains as collateral such initial margin as required by the exchange on which the transaction is effected. Pursuant to the contract, the Funds agree to receive from or pay to the broker an amount of cash equal to the daily fluctuation in value of the contract. Such receipts or payments are known as variation margin and are recorded by the Funds as unrealized gains or losses. When the contract is closed, the Funds record a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value at the time it was closed. * Forward interest rate swaps--The Funds may enter into forward interest rate swaps. In a forward interest rate swap, the Funds and the counterparty agree to pay or receive interest on a specified notional contract amount, commencing on a specified future effective date, unless terminated earlier. The value of the agreement is determined by quoted fair values received daily by the Funds from the counterparty. When the agreement is closed, the Funds record a realized gain or loss in an amount equal to the value of the agreement. * Swaps--Each Fund may enter into swap agreements, which are OTC contracts in which each Fund and a counterparty agree to make periodic net payments on a specified notional amount. The net payments can be made for a set period of time or may be triggered by a pre-determined credit event. The net periodic payments may be based on a fixed or variable interest rate; the change in market value of a specified security, basket of securities or index; or the return generated by a security. These periodic payments received or made by each Fund are recorded in the accompanying Statement of Operations as realized gains or losses, respectively. Gains or losses are also realized upon termination of the swap agreements. Swaps are marked-to-market daily and changes in value are recorded as unrealized appreciation (depreciation). Risks include changes in the returns of the underlying instruments, failure of the counterparties to perform under the contracts' terms and the possible lack of liquidity with respect to the swap agreements. (c) Municipal bonds held in trust--The BlackRock Municipal Insured Fund and BlackRock National Municipal Fund invest in leveraged residual certificates ("TOB Residuals") issued by tender option bond trusts ("TOBs"). A TOB is established by a third party sponsor forming a special purpose entity, into which a fund, or an agent on behalf of the fund, transfers municipal securities. A TOB typically issues two classes of beneficial interests: short- term floating rate certificates, which are sold to third party investors, and residual certificates, which are generally issued to the fund which made the transfer or to affiliates of the fund. Each of these Funds' transfers of the municipal securities to a TOB do not qualify for sale treatment under Statement of Financial Accounting Standards No. 140 "Accounting for Transfers and Servicing of Financial Assets and Extinguishments of Liabilities," therefore the municipal securities deposited into a TOB are presented in each of these Funds' schedules of investments and the proceeds from the transactions are reported as a liability for trust certificates of each of these Funds. Interest income from the underlying security is recorded by these Funds on an accrual basis. Interest expense incurred on the secured borrowing and other expenses related to remarketing, administration and trustee services to a TOB are reported as expenses of a Fund. The floating rate certificates have interest rates that generally reset weekly and their holders have the option to tender certificates to the TOB for redemption at par at each reset date. The residual interests held by these Funds include the right of the Funds (1) to cause the holders of a proportional share of floating rate certificates to tender their certificates at par, and (2) to transfer a corresponding share of the municipal securities from the TOB to the Funds. At June 30, 2007, the aggregate value of the underlying municipal securities transferred to TOBs and the related liability for trust certificates were: Range of Interest Underlying Rates on Municipal Liability for the Liability Bonds Trust for Trust Transferred Certificates Certificates to TOBs BlackRock Municipal 3.77% - Insured Fund $109,775,745 3.83% $219,405,078 BlackRock National 3.74% - Municipal Fund $151,796,404 3.85% $306,597,108 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Notes to Financial Statements (continued) Financial transactions executed through TOBs generally will underperform the market for fixed rate municipal bonds in a rising interest rate environment, but tend to outperform the market for fixed rate bonds when interest rates decline or remain relatively stable. Should short-term interest rates rise, the Funds' investments in TOB Residuals likely will adversely affect the Funds' investment income-net and distributions to shareholders. Fluctuations in the market value of municipal securities deposited into the TOB may adversely affect these Funds' net asset value per share. While the Funds' investment policies and restrictions expressly permit investments in inverse floating rate securities such as TOB Residuals, they generally do not allow the Funds to borrow money for purposes of making investments. The Funds' management believes that the Funds' restrictions on borrowings do not apply to the secured borrowings deemed to have occurred for accounting purposes. (d) Income taxes--It is the Bond Fund's policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute substantially all of its taxable income to its shareholders. Therefore, no federal income tax provision is required. (e) Security transactions and investment income--Security transactions are recorded on the dates the trans-actions are entered into (the trade dates). Realized gains and losses on security transactions are determined on the identified cost basis. Dividend income is recorded on the ex-dividend dates. Interest income is recognized on the accrual basis. The Funds amortize all premiums and discounts on debt securities. (f) Prepaid registration fees--Prepaid registration fees are charged to expense as the related shares are issued. (g) Dividends and distributions--Dividends from net investment income are declared daily and paid monthly. Distributions of capital gains are recorded on the ex-dividend dates. (h) Expenses--Certain expenses have been allocated to the individual Funds in the Bond Fund on a pro rata basis based upon the respective aggregate net asset value of each Fund included in the Bond Fund. (i) Insurance--BlackRock Municipal Insured Fund: Where bonds in the Fund have not been insured pursuant to policies obtained by the issuer, the Fund has obtained insurance with respect to the payment of interest and principal of each bond. Such insurance is valid as long as the bonds are held by the Fund. (j) Offering costs--BlackRock Municipal High Yield Fund: Offering costs are amortized over a 12-month period beginning with the commencement of operations of the Fund. (k) Recent accounting pronouncements--In July 2006, the Financial Accounting Standards Board ("FASB") issued Interpretation No. 48 ("FIN 48"), "Accounting for Uncertainty in Income Taxes - an interpretation of FASB Statement No. 109." FIN 48 prescribes the minimum recognition threshold a tax position must meet in connection with accounting for uncertainties in income tax positions taken or expected to be taken by an entity, including mutual funds, before being measured and recognized in the financial statements. Adoption of FIN 48 is required for the last net asset value calculation in the first required financial statement reporting period for fiscal years beginning after December 15, 2006. The impact on the Funds' financial statements, if any, is currently being assessed. In September 2006, Statement of Financial Accounting Standards No. 157, "Fair Value Measurements" ("FAS 157"), was issued and is effective for fiscal years beginning after November 15, 2007. FAS 157 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. Management is currently evaluating the implication of FAS 157. At this time, its impact on the Funds' financial statements has not been determined. In addition, in February 2007, Statement of Financial Accounting Standard No. 159, "The Fair Value Option for Financial Assets and Financial Liabilities" ("FAS 159"), was issued and is effective for fiscal years beginning after November 15, 2007. Early adoption is permitted as of the beginning of a fiscal year that begins on or before November 15, 2007, provided the entity also elects to apply the provisions of FAS 157. FAS 159 permits entities to choose to measure many financial instruments and certain other items at fair value that are not currently required to be measured at fair value. FAS 159 also establishes presentation and disclosure requirements designed to facilitate comparisons between entities that choose different measurement attributes for similar types of assets and liabilities. At this time, management is evaluating the implications of FAS 159 and its impact on the Funds' financial statements, if any, has not been determined. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Notes to Financial Statements (continued) (l) Reclassifications--U.S. generally accepted accounting principles require that certain components of net assets be adjusted to reflect permanent differences between financial and tax reporting. Accordingly, the current year's permanent book/tax differences have been reclassified as follows: BlackRock Municipal Insured Fund $157 has been reclassified between paid-in capital in excess of par and accumulated net realized capital losses and $201 was reclassified between undistributed net investment income and accumulated net realized capital losses as a result of permanent differences attributable to distributions paid in excess of taxable income and amortization methods on fixed income securities. These reclassifications have no effect on net assets or net asset values per share. BlackRock National Municipal Fund $11,890,944 has been reclassified between paid-in capital in excess of par and accumulated realized net capital losses as a result of a permanent difference attributable to expired capital loss carryforwards. This reclassification has no effect on net assets or net asset values per share. BlackRock High Yield Municipal Fund $103,720 has been reclassified between paid-in capital in excess of par and undistributed net investment income as a result of permanent differences attributable to non-deductible expenses. This reclassification has no effect on net assets or net asset values per share. 2. Investment Advisory Agreement and Transactions with Affiliates: On September 29, 2006, BlackRock, Inc. and Merrill Lynch & Co., Inc. ("Merrill Lynch") combined Merrill Lynch's investment management business, Merrill Lynch Investment Managers, L.P. ("MLIM"), and its affiliates, including FAM, with BlackRock, Inc. to create a new independent company. Merrill Lynch has a 49.8% economic interest and a 45% voting interest in the combined company and The PNC Financial Services Group, Inc. ("PNC") has approximately a 34% economic and voting interest. The new company operates under the BlackRock name and is governed by a board of directors with a majority of independent members. On August 15, 2006, shareholders of each of the Funds (other than BlackRock High Yield Municipal Fund, which was approved by FAM as the sole shareholder on July 7, 2007), approved a new Investment Advisory Agreement with BlackRock Advisors, Inc., an indirect, wholly owned subsidiary of BlackRock, Inc. BlackRock Advisors, Inc. was reorganized into a limited liability company and renamed BlackRock Advisors, LLC (the "Manager"). The new Investment Advisory Agreement between each Fund and the Manager became effective on September 29, 2006 and was revised on October 27, 2006 (except for BlackRock High Yield Municipal Fund). Prior to September 29, 2006, FAM was the Funds' manager. The general partner of FAM is an indirect, wholly owned subsidiary of Merrill Lynch, which is the limited partner. The Funds have also entered into separate Distribution Agreements and Distribution Plans with FAM Distributors, Inc. ("FAMD") and BlackRock Distributors, Inc. and its affiliates ("BDI") (collectively, the "Distributor"). FAMD is a wholly owned subsidiary of Merrill Lynch Group, Inc. and BDI is an affiliate of BlackRock, Inc. The Manager is responsible for the management of each Fund's portfolios and provides the necessary personnel, facilities, equipment and certain other services necessary to the operation of the Bond Fund. For such services, the Manager receives at the end of each month a fee with respect to each Fund at the annual rates set forth below which are based upon the average daily value of the Fund's net assets. Rate of Advisory Fee BlackRock BlackRock BlackRock Aggregate of Average Short-Term Municipal National Daily Net Assets of the Municipal Insured Municipal Three Combined Funds Fund Fund Fund Not exceeding $250 million .40 % .40 % .50 % In excess of $250 million but not exceeding $400 million .375% .375% .475% In excess of $400 million but not exceeding $550 million .35 % .375% .475% In excess of $550 million but not exceeding $1.5 billion .325% .375% .475% In excess of $1.5 billion .325% .35 % .475% For the period September 29, 2006 to October 27, 2006, a different and lower fee schedule was in effect for BlackRock Municipal Insured Fund and BlackRock National Municipal Fund. The BlackRock High Yield Municipal Fund's rates are as follows: .55% of the Fund's average daily net assets not exceeding $250 million; .525% of average daily net assets in excess of $250 million but not exceeding $500 million; and ..50% of average daily net assets in excess of $500 million. In addition, for the BlackRock High Yield Municipal Fund, the Manager has voluntarily agreed to waive a portion of the management fee. The amount of waiver is determined monthly and can be discontinued at any time. For the period August 1, 2006 to June 30, 2007, the amount of the management fee the Fund paid ranged from .20% to .35% of average daily net assets. For the period August 1, 2006 to September 29, 2006, FAM earned fees of $31,960, of which $26,149 was waived. For the period September 30, 2006 to June 30, 2007, the Manager earned fees of $235,082, of which $132,929 was waived. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Notes to Financial Statements (continued) For the BlackRock Short-Term Municipal Fund effective October 16, 2006, the Manager has contractually agreed to waive expenses in order to limit expenses as a percentage of average daily net assets allocated to each class as follows: .35% for BlackRock Shares, .45% for Institutional Shares and .80% for Investor A Shares, until February 1, 2007. In addition to this contractual waiver, the Manager has voluntarily agreed to waive fees or expenses in order to limit expenses as follows: .35% for Institutional Shares, .60% for Investor A Shares, .45% for Investor A1 Shares, .70% for Investor B Shares and 1.35% for Investor C Shares. For the year ended June 30, 2007, the Manager earned fees of $1,026,166, of which $281,131 was waived. In addition, the Manager has entered into sub-advisory agreements with BlackRock Investment Management, LLC ("BIM"), an affiliate of the Manager, under which the Manager pays the Sub-Adviser for services it provides to each Fund, a monthly fee that is a percentage of the management fee paid by each Fund to the Manager. The Manager (and previously FAM) has agreed to waive its advisory fee for each Fund by the amount of advisory fee each Fund pays to the Manager (and previously FAM) indirectly through each Fund's investment in the Merrill Lynch Institutional Tax-Exempt Fund. For the year ended June 30, 2007, the waivers were as follows: For the Period For the Period July 1, 2006 to September 30, 2006 September 29, 2006 to June 30, 2007 Waived Waived by by FAM* the Manager BlackRock Short-Term Municipal Fund $ 8,247 $ 10,212 BlackRock Municipal Insured Fund $ 3,580 $ 13,998 BlackRock National Municipal Fund $ 20,279 $ 64,983 BlackRock High Yield Municipal Fund $ 758 $ 2,866 * BlackRock High Yield Municipal Fund commenced operations on August 1, 2006. Pursuant to the Distribution Plans adopted by the Bond Fund on behalf of the Funds in accordance with Rule 12b-1 under the Investment Company Act of 1940, each Fund pays the Distributor ongoing service and distribution fees. The fees are accrued daily and paid monthly at annual rates based upon the average daily net assets of the shares as follows: Service Fees BlackRock BlackRock BlackRock BlackRock Short-Term Municipal National High Yield Municipal Insured Municipal Municipal Fund Fund Fund Fund Investor A .25% .25% .25% .25% Investor A1 .10% -- -- -- Investor B .15% .25% .25% -- Investor C .25% .25% .25% .25% Investor C1 -- .25% .25% -- Distribution Fees BlackRock BlackRock BlackRock BlackRock Short-Term Municipal National High Yield Municipal Insured Municipal Municipal Fund Fund Fund Fund Investor B .20% .50% .50% -- Investor C .75% .75% .75% .75% Investor C1 -- .55% .55% -- Pursuant to sub-agreements with each Distributor, broker-dealers, including Merrill Lynch, Pierce, Fenner & Smith Incorporated ("MLPF&S"), a wholly owned subsidiary of Merrill Lynch, provide shareholder servicing and distribution services to the Bond Fund. The ongoing service fee compensates the Distributor and each broker-dealer (including MLPF&S) for providing shareholder servicing to Investor A, Investor A1, Investor B, Investor C and Investor C1 shareholders. The ongoing distribution fee compensates each Distributor and the broker-dealers for providing shareholder and distribution-related services to Investor B, Investor C and Investor C1 shareholders. For the year ended June 30, 2007, FAMD, the Fund's sole Distributor until September 29, 2006, and BDI earned underwriting discounts and direct commissions and MLPF&S earned dealer concessions on sales of the Fund's Institutional, Investor A and Investor A1 Shares as follows: BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Notes to Financial Statements (continued) BlackRock BlackRock BlackRock BlackRock Short-Term Municipal National High Yield Municipal Insured Municipal Municipal Fund Fund Fund Fund Institutional Shares: FAMD -- $ 750 $ 337 -- MLPF&S -- $ 750 $ 337 -- Investor A Shares: FAMD $1,073 $ 6,909 $ 40,470 $ 2,424 MLPF&S $8,240 $75,664 $437,598 $25,546 BDI -- $ 2,154 $ 740 -- Investor A1 Shares: FAMD $ 217 -- -- -- MLPF&S $3,200 -- -- -- For the year ended June 30, 2007, MLPF&S received contingent deferred sales charges relating to Investor B, Investor C and Investor C1 Shares as follows: Investor B Investor C Investor C1 BlackRock Short-Term Municipal Fund $10,823 $ 305 -- BlackRock Municipal Insured Fund $35,903 $ 111 $ 955 BlackRock National Municipal Fund $50,965 $9,259 $17,026 BlackRock High Yield Municipal Fund -- $ 641 -- In addition, BDI received contingent deferred sales charges relating to Investor B and Investor C1 Shares as follows: Investor B Investor C1 BlackRock Municipal Insured Fund -- $ 661 BlackRock National Municipal Fund $5 -- Furthermore, MLPF&S received contingent deferred sales charges relating to transactions subject to front-end sales charge waivers as follows: Investor A Investor A1 BlackRock Short-Term Municipal Fund -- $3,722 BlackRock Municipal Insured Fund $ 740 -- BlackRock National Municipal Fund $17,107 -- BlackRock High Yield Municipal Fund $ 875 -- The Manager maintains a call center, which is responsible for providing certain shareholder services to the Bond Fund, such as responding to shareholder inquiries and processing transactions based upon instructions from shareholders with respect to the subscription and redemption of fund shares. During the period September 30, 2006 to June 30, 2007, the following amounts have been accrued by each Fund to reimburse the Manager for costs incurred running the call center, which are a component of the transfer agent fees in the accompanying Statements of Operations. Call Center Fees BlackRock BlackRock BlackRock BlackRock Short-Term Municipal National High Yield Municipal Insured Municipal Municipal Fund Fund Fund Fund Institutional $ 1,895 $12,542 $36,268 $12,959 Investor A -- $ 2,514 $ 3,852 $ 773 Investor A1 $ 1,021 -- -- -- Investor B $ 322 $ 1,160 $ 2,266 -- Investor C -- -- -- $ 819 Investor C1 -- $ 789 $ 1,840 -- For the year ended June 30, 2007, each Fund reimbursed FAM and the Manager for certain accounting services. The reimbursements were as follows: For the Period For the Period July 1, 2006 September 30, 2006 to September 29, to June 30, 2006 Reimbursed 2007 Reimbursed to FAM* to the Manager BlackRock Short-Term Municipal Fund $1,722 $ 4,304 BlackRock Municipal Insured Fund $5,362 $13,108 BlackRock National Municipal Fund $8,749 $22,558 BlackRock High Yield Municipal Fund $ 169 $ 811 * BlackRock High Yield Municipal Fund commenced operations on August 1, 2006. Effective September 29, 2006, PFPC Inc., an indirect, wholly owned subsidiary of PNC and an affiliate of the Manager, became each Fund's transfer agent. Prior to September 29, 2006, each Fund's transfer agent was Financial Data Services, Inc. ("FDS"), a wholly owned subsidiary of Merrill Lynch. Prior to September 29, 2006, certain officers and/or directors of the Bond Fund were officers and/or directors of MLIM, FAM, FAMD, FDS, Merrill Lynch, and/or MLIM, LLC. Commencing September 29, 2006, certain officers and/or directors of the Bond Fund are officers and/or directors of BlackRock, Inc. or its affiliates. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Notes to Financial Statements (continued) 3. Investments: Purchases and sales of investments, excluding short-term securities, for the year ended June 30, 2007 were as follows: Purchases Sales BlackRock Short-Term Municipal Fund $285,719,979 $327,640,415 BlackRock Municipal Insured Fund $364,487,540 $409,119,250 BlackRock National Municipal Fund $882,412,150 $757,408,261 BlackRock High Yield Municipal Fund $ 77,254,912 $ 8,375,064 4. Capital Share Transactions: Net increase (decrease) in net assets derived from capital share transactions for the years ended June 30, 2007 and June 30, 2006 were as follows: For the Year For the Year Ended June 30, Ended June 30, 2007* 2006 BlackRock Short-Term Municipal Fund $ (62,634,810) $(118,737,525) BlackRock Municipal Insured Fund $ (60,444,977) $ (66,044,701) BlackRock National Municipal Fund $ 159,104,907 $ 46,489,740 BlackRock High Yield Municipal Fund $ 73,526,873 -- * BlackRock High Yield Municipal Fund commenced operations on August 1, 2006. Transactions in capital shares for each class were as follows: BlackRock Short-Term Municipal Fund BlackRock Shares for the Period October 2, 2006* Dollar to June 30, 2007 Shares Amount Shares sold 2,874 $ 28,519 Shares issued resulting from reorganization 1,094,165 10,856,031 Shares issued to shareholders in reinvestment of dividends 13,277 131,697 -------------- --------------- Total issued 1,110,316 11,016,247 Shares redeemed (861,862) (8,542,264) -------------- --------------- Net increase 248,454 $ 2,473,983 ============== =============== * Commencement of operations. Institutional Shares for the Year Dollar Ended June 30, 2007 Shares Amount Shares sold 2,062,719 $ 20,427,498 Shares issued resulting from reorganization 721,266 7,153,239 Shares issued to shareholders in reinvestment of dividends 247,581 2,449,491 -------------- --------------- Total issued 3,031,566 30,030,228 Shares redeemed (4,877,444) (48,321,661) -------------- --------------- Net decrease (1,845,878) $ (18,291,433) ============== =============== Institutional Shares for the Year Dollar Ended June 30, 2006 Shares Amount Shares sold 1,502,926 $ 14,921,923 Shares issued to shareholders in reinvestment of dividends 260,966 2,590,922 -------------- --------------- Total issued 1,763,892 17,512,845 Shares redeemed (5,351,695) (53,153,601) -------------- --------------- Net decrease (3,587,803) $ (35,640,756) ============== =============== Investor A Shares for the Period October 2, 2006* Dollar to June 30, 2007 Shares Amount Shares sold 185,469 $ 1,838,827 Shares issued resulting from reorganization 2,042 20,254 Shares issued to shareholders in reinvestment of dividends 1,586 15,703 -------------- --------------- Total issued 189,097 1,874,784 Shares redeemed (41,774) (414,043) -------------- --------------- Net increase 147,323 $ 1,460,741 ============== =============== * Commencement of operations. Investor A1 Shares for the Year Dollar Ended June 30, 2007 Shares Amount Shares sold 637,356 $ 6,322,744 Shares issued resulting from conversion of Class C 6,091,469 60,465,669 Automatic conversion of shares 41,150 407,926 Shares issued to shareholders in reinvestment of dividends 226,609 2,247,647 -------------- --------------- Total issued 6,996,584 69,443,986 Shares redeemed (4,669,705) (46,309,628) -------------- --------------- Net increase 2,326,879 $ 23,134,358 ============== =============== BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Notes to Financial Statements (continued) Investor A1 Shares for the Year Dollar Ended June 30, 2006 Shares Amount Shares sold 821,123 $ 8,169,499 Automatic conversion of shares 145,897 1,206,454 Shares issued to shareholders in reinvestment of dividends 121,345 1,449,949 -------------- --------------- Total issued 1,088,365 10,825,902 Shares redeemed (5,163,012) (51,318,356) -------------- --------------- Net decrease (4,074,647) $ (40,492,454) ============== =============== Investor B Shares for the Year Dollar Ended June 30, 2007 Shares Amount Shares sold 37,626 $ 372,718 Shares issued to shareholders in reinvestment of dividends 33,215 329,149 -------------- --------------- Total issued 70,841 701,867 -------------- --------------- Automatic conversion of shares (41,162) (407,926) Shares redeemed (979,358) (9,708,676) -------------- --------------- Total redeemed (1,020,520) (10,116,602) -------------- --------------- Net decrease (949,679) $ (9,414,735) ============== =============== Investor B Shares for the Year Dollar Ended June 30, 2006 Shares Amount Shares sold 38,884 $ 386,427 Shares issued to shareholders in reinvestment of dividends 44,426 441,220 -------------- --------------- Total issued 83,310 827,647 -------------- --------------- Automatic conversion of shares (121,450) (1,206,454) Shares redeemed (1,415,324) (14,064,507) -------------- --------------- Total redeemed (1,536,774) (15,270,961) -------------- --------------- Net decrease (1,453,464) $ (14,443,314) ============== =============== Investor C Shares for the Period October 2, 2006* Dollar to June 30, 2007 Shares Amount Shares sold 231,602 $ 2,295,349 Shares issued to shareholders in reinvestment of dividends 1,443 14,283 -------------- --------------- Total issued 233,045 2,309,632 Shares redeemed (22,138) (219,427) -------------- --------------- Net increase 210,907 $ 2,090,205 ============== =============== * Commencement of operations. Class C Shares for the Period July 1, 2006 Dollar to August 25, 2006* Shares Amount Shares sold 62,189 $ 613,069 Shares issued to shareholders in reinvestment of dividends 18,853 185,978 -------------- --------------- Total issued 81,042 799,047 -------------- --------------- Shares redeemed (448,474) (4,421,307) Shares redeemed resulting from conversion to Investor A1 (6,122,405) (60,465,669) -------------- --------------- Total redeemed (6,570,879) (64,886,976) -------------- --------------- Net decrease (6,489,837) $ (64,087,929) ============== =============== * On August 25, 2006, Class C was converted to Class A (Investor A1). Class C Shares for the Year Dollar Ended June 30, 2006 Shares Amount Shares sold 611,352 $ 6,048,208 Shares issued to shareholders in reinvestment of dividends 115,698 1,143,935 -------------- --------------- Total issued 727,050 7,192,143 Shares redeemed (3,572,643) (35,353,144) -------------- --------------- Net decrease (2,845,593) $ (28,161,001) ============== =============== BlackRock Municipal Insured Fund Institutional Shares for the Year Dollar Ended June 30, 2007 Shares Amount Shares sold 1,615,547 $ 12,595,757 Shares issued to shareholders in reinvestment of dividends and distributions 1,793,351 14,025,199 -------------- --------------- Total issued 3,408,898 26,620,956 Shares redeemed (7,836,614) (61,267,411) -------------- --------------- Net decrease (4,427,716) $ (34,646,455) ============== =============== Institutional Shares for the Year Dollar Ended June 30, 2006 Shares Amount Shares sold 1,459,336 $ 11,434,123 Shares issued to shareholders in reinvestment of dividends and distributions 1,775,119 13,924,940 -------------- --------------- Total issued 3,234,455 25,359,063 Shares redeemed (8,382,862) (65,699,941) -------------- --------------- Net decrease (5,148,407) $ (40,340,878) ============== =============== BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Notes to Financial Statements (continued) Investor A Shares for the Year Dollar Ended June 30, 2007 Shares Amount Shares sold 2,509,751 $ 19,609,272 Automatic conversion of shares 200,919 1,560,842 Shares issued to shareholders in reinvestment of dividends and distributions 511,923 4,001,861 -------------- --------------- Total issued 3,222,593 25,171,975 Shares redeemed (3,167,212) (24,734,287) -------------- --------------- Net increase 55,381 $ 437,688 ============== =============== Investor A Shares for the Year Dollar Ended June 30, 2006 Shares Amount Shares sold 1,348,298 $ 10,584,431 Automatic conversion of shares 981,047 7,688,689 Shares issued to shareholders in reinvestment of dividends and distributions 509,243 3,992,856 -------------- --------------- Total issued 2,838,588 22,265,976 Shares redeemed (3,222,764) (25,174,807) -------------- --------------- Net decrease (384,176) $ (2,908,831) ============== =============== Investor B Shares for the Year Dollar Ended June 30, 2007 Shares Amount Shares sold 70,027 $ 547,519 Shares issued to shareholders in reinvestment of dividends and distributions 127,963 1,000,612 -------------- --------------- Total issued 197,990 1,548,131 -------------- --------------- Automatic conversion of shares (200,919) (1,560,842) Shares redeemed (2,714,992) (21,186,228) -------------- --------------- Total redeemed (2,915,911) (22,747,070) -------------- --------------- Net decrease (2,717,921) $ (21,198,939) ============== =============== Investor B Shares for the Year Dollar Ended June 30, 2006 Shares Amount Shares sold 236,379 $ 1,852,684 Shares issued to shareholders in reinvestment of dividends and distributions 174,687 1,370,101 -------------- --------------- Total issued 411,066 3,222,785 -------------- --------------- Automatic conversion of shares (981,283) (7,688,689) Shares redeemed (2,200,222) (17,243,259) -------------- --------------- Total redeemed (3,181,505) (24,931,948) -------------- --------------- Net decrease (2,770,439) $ (21,709,163) ============== =============== Investor C Shares for the Period October 2, 2006* to Dollar June 30, 2007 Shares Amount Shares sold 595,100 $ 4,659,402 Shares issued to shareholders in reinvestment of dividends and distributions 4,158 32,362 -------------- --------------- Total issued 599,258 4,691,764 Shares redeemed (7,785) (61,282) -------------- --------------- Net increase 591,473 $ 4,630,482 ============== =============== * Commencement of operations. Investor C1 Shares for the Year Dollar Ended June 30, 2007 Shares Amount Shares sold 252,508 $ 1,971,349 Shares issued to shareholders in reinvestment of dividends and distributions 150,681 1,178,188 -------------- --------------- Total issued 403,189 3,149,537 Shares redeemed (1,641,491) (12,817,290) -------------- --------------- Net decrease (1,238,302) $ (9,667,753) ============== =============== Investor C1 Shares for the Year Dollar Ended June 30, 2006 Shares Amount Shares sold 1,343,228 $ 10,538,215 Shares issued to shareholders in reinvestment of dividends and distributions 162,002 1,270,193 -------------- --------------- Total issued 1,505,230 11,808,408 Shares redeemed (1,646,563) (12,894,237) -------------- --------------- Net decrease (141,333) $ (1,085,829) ============== =============== BlackRock National Municipal Fund Institutional Shares for the Year Dollar Ended June 30, 2007 Shares Amount Shares sold 13,585,783 $ 142,980,852 Shares issued to shareholders in reinvestment of dividends 2,842,429 29,937,810 -------------- --------------- Total issued 16,428,212 172,918,662 Shares redeemed (8,439,693) (88,795,553) -------------- --------------- Net increase 7,988,519 $ 84,123,109 ============== =============== Institutional Shares for the Year Dollar Ended June 30, 2006 Shares Amount Shares sold 5,928,015 $ 62,151,396 Shares issued to shareholders in reinvestment of dividends 2,713,665 28,501,117 -------------- --------------- Total issued 8,641,680 90,652,513 Shares redeemed (7,929,485) (83,222,555) -------------- --------------- Net increase 712,195 $ 7,429,958 ============== =============== BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Notes to Financial Statements (continued) Investor A Shares for the Year Dollar Ended June 30, 2007 Shares Amount Shares sold 10,184,912 $ 107,187,461 Automatic conversion of shares 262,676 2,748,322 Shares issued to shareholders in reinvestment of dividends 716,831 7,552,056 -------------- --------------- Total issued 11,164,419 117,487,839 Shares redeemed (4,936,616) (51,956,483) -------------- --------------- Net increase 6,227,803 $ 65,531,356 ============== =============== Investor A Shares for the Year Dollar Ended June 30, 2006 Shares Amount Shares sold 5,809,040 $ 60,821,050 Automatic conversion of shares 1,794,525 18,842,536 Shares issued to shareholders in reinvestment of dividends 547,471 5,750,522 -------------- --------------- Total issued 8,151,036 85,414,108 Shares redeemed (4,046,647) (42,487,976) -------------- --------------- Net increase 4,104,389 $ 42,926,132 ============== =============== Investor B Shares for the Year Dollar Ended June 30, 2007 Shares Amount Shares sold 638,307 $ 6,734,106 Shares issued to shareholders in reinvestment of dividends 200,896 2,114,751 -------------- --------------- Total issued 839,203 8,848,857 -------------- --------------- Automatic conversion of shares (262,928) (2,748,322) Shares redeemed (3,778,461) (39,770,275) -------------- --------------- Total redeemed (4,041,389) (42,518,597) -------------- --------------- Net decrease (3,202,186) $ (33,669,740) ============== =============== Investor B Shares for the Year Dollar Ended June 30, 2006 Shares Amount Shares sold 738,406 $ 7,749,159 Shares issued to shareholders in reinvestment of dividends 254,982 2,677,936 -------------- --------------- Total issued 993,388 10,427,095 -------------- --------------- Automatic conversion of shares (1,796,012) (18,842,536) Shares redeemed (2,903,855) (30,484,753) -------------- --------------- Total redeemed (4,699,867) (49,327,289) -------------- --------------- Net decrease (3,706,479) $ (38,900,194) ============== =============== Investor C Shares for the Period October 2, 2006* to Dollar June 30, 2007 Shares Amount Shares sold 4,176,661 $ 44,069,366 Shares issued to shareholders in reinvestment of dividends 35,768 375,990 -------------- --------------- Total issued 4,212,429 44,445,356 Shares redeemed (202,337) (2,132,581) -------------- --------------- Net increase 4,010,092 $ 42,312,775 ============== =============== * Commencement of operations. Investor C1 Shares for the Year Dollar Ended June 30, 2007 Shares Amount Shares sold 2,120,136 $ 22,245,747 Shares issued to shareholders in reinvestment of dividends 371,250 3,911,253 -------------- --------------- Total issued 2,491,386 26,157,000 Shares redeemed (2,408,164) (25,349,593) -------------- --------------- Net increase 83,222 $ 807,407 ============== =============== Investor C1 Shares for the Year Dollar Ended June 30, 2006 Shares Amount Shares sold 4,865,773 $ 51,061,570 Shares issued to shareholders in reinvestment of dividends 296,743 3,115,813 -------------- --------------- Total issued 5,162,516 54,177,383 Shares redeemed (1,825,533) (19,143,539) -------------- --------------- Net increase 3,336,983 $ 35,033,844 ============== =============== BlackRock High Yield Municipal Fund Institutional Shares for the Period August 1, 2006* Dollar to June 30, 2007 Shares Amount Shares sold 6,785,278 $ 68,322,908 Shares issued to shareholders in reinvestment of dividends and distributions 2,198 22,293 -------------- --------------- Total issued 6,787,476 68,345,201 Shares redeemed (518,933) (5,228,829) -------------- --------------- Net increase 6,268,543 $ 63,116,372 ============== =============== * Prior to August 1, 2006 (commencement of operations), the Fund issued 25 shares to FAM for $250. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Notes to Financial Statements (continued) Investor A Shares for the Period August 1, 2006* Dollar to June 30, 2007 Shares Amount Shares sold 691,133 $ 6,961,080 Shares issued to shareholders in reinvestment of dividends and distributions 3,655 36,897 -------------- --------------- Total issued 694,788 6,997,977 Shares redeemed (102,603) (1,035,823) -------------- --------------- Net increase 592,185 $ 5,962,154 ============== =============== * Prior to August 1, 2006 (commencement of operations), the Fund issued 25 shares to FAM for $250. Investor C Shares for the Period August 1, 2006* to Dollar June 30, 2007 Shares Amount Shares sold 456,486 $ 4,621,438 Shares issued to shareholders in reinvestment of dividends and distributions 5,243 53,125 -------------- --------------- Total issued 461,729 4,674,563 Shares redeemed (22,433) (226,216) -------------- --------------- Net increase 439,296 $ 4,448,347 ============== =============== * Prior to August 1, 2006 (commencement of operations), the Fund issued 25 shares to FAM for $250. 5. Short-Term Borrowings: The Bond Fund, on behalf of the Funds, along with certain other funds managed by the Manager and its affiliates is a party to a $500,000,000 credit agreement with a group of lenders, which expires November 2007. The Bond Fund may borrow under the credit agreement to fund shareholder redemptions and for other lawful purposes other than for leverage. The Bond Fund may borrow up to the maximum amount allowable under the Bond Fund's current prospectus and statement of additional information, subject to various other legal, regulatory or contractual limits. The Bond Fund pays a commitment fee of .06% per annum based on the Bond Fund's pro rata share of the unused portion of the credit agreement. Amounts borrowed under the credit agreement bear interest at a rate equal to, at each fund's election, the federal funds rate plus .35% or a base rate as defined in the credit agreement. The Bond Fund did not borrow under the credit agreement during the year ended June 30, 2007. 6. Distributions to Shareholders: BlackRock Short-Term Municipal Fund The tax character of distributions paid during the fiscal years ended June 30, 2007 and June 30, 2006 was as follows: 6/30/2007 6/30/2006 Distributions paid from: Tax-exempt income $ 9,759,232 $ 9,982,026 -------------- --------------- Total distributions $ 9,759,232 $ 9,982,026 ============== =============== As of June 30, 2007, the components of accumulated losses on a tax basis were as follows: Undistributed tax-exempt income--net $ 484,004 Undistributed long-term capital gains--net -- --------------- Total undistributed earnings--net 484,004 Capital loss carryforward (9,187,219)* Unrealized losses--net (847,300)** --------------- Total accumulated losses--net $ (9,550,515) =============== * On June 30, 2007, the Fund had a net capital loss carryforward of $9,187,219, of which $119,413 expires in 2008, $426,094 expires in 2009, $32,641 expires in 2011, $331,374 expires in 2012, $1,178,808 expires in 2013, $4,110,940 expires in 2014 and $2,987,949 expires in 2015. This amount will be available to offset like amounts of any future taxable gains. ** The difference between book-basis and tax-basis net unrealized gains is attributable primarily to the deferral of post-October capital losses for tax purposes. BlackRock Municipal Insured Fund The tax character of distributions paid during the fiscal years ended June 30, 2007 and June 30, 2006 was as follows: 6/30/2007 6/30/2006 Distributions paid from: Tax-exempt income $ 37,725,824 $ 42,519,947 Ordinary income 46,235 -- Net long-term capital gain 4,937,590 3,748,903 -------------- --------------- Total distributions $ 42,709,649 $ 46,268,850 ============== =============== As of June 30, 2007, the components of accumulated earnings on a tax basis were as follows: Undistributed tax-exempt income--net $ 1,071,111 Undistributed long-term capital gains--net -- --------------- Total undistributed earnings--net 1,071,111 Capital loss carryforward -- Unrealized gains--net 24,677,624 --------------- Total accumulated earnings--net $ 25,748,735 =============== * The difference between book-basis and tax-basis net unrealized gains is attributable primarily to the tax deferral of losses on wash sales, the deferral of post-October capital losses for tax purposes, the tax deferral of losses on the difference between book and tax amortization methods for premiums and discounts on fixed income securities, the tax deferral of losses on straddles, and the difference between book and tax treatment of residual interests in tender option bond trusts. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Notes to Financial Statements (concluded) BlackRock National Municipal Fund The tax character of distributions paid during the fiscal years ended June 30, 2007 and June 30, 2006 was as follows: 6/30/2007 6/30/2006 Distributions paid from: Tax-exempt income $ 68,642,500 $ 67,143,031 -------------- --------------- Total distributions $ 68,642,500 $ 67,143,031 ============== =============== As of June 30, 2007, the components of accumulated earnings on a tax basis were as follows: Undistributed tax-exempt income--net $ 914,699 Undistributed long-term capital gains--net -- --------------- Total undistributed earnings--net 914,699 Capital loss carryforward (26,847,836)* Unrealized gains--net 37,031,021** --------------- Total accumulated earnings--net $ 11,097,884 =============== * On June 30, 2007, the Fund had a net capital loss carryforward of $26,847,836, of which $23,869,173 expires in 2009, $444,566 expires in 2010, $942,957 expires in 2011 and $1,591,140 expires in 2012. This amount will be available to offset like amounts of any future taxable gains. ** The difference between book-basis and tax-basis net unrealized gains is attributable primarily to the difference between book and tax amortization methods for premiums and discounts on fixed income securities, the tax deferral of losses on straddles and the difference between the book and tax treatment of residual interests in tender option bond trusts. BlackRock High Yield Municipal Fund The tax character of distributions paid during the period August 1, 2006 to June 30, 2007 was as follows: For the Period August 1, 2006++ to June 30, 2007 Distributions paid from: Tax-exempt income $ 2,089,925 Ordinary income 10,305 --------------- Total distributions $ 2,100,230 =============== ++ Commencement of operations. As of June 30, 2007, the components of accumulated losses on a tax basis were as follows: Undistributed tax-exempt income--net $ 103,720 Undistributed ordinary income--net 130,480 Undistributed long-term capital gains--net 21,570 --------------- Total undistributed earnings--net 255,770 Capital loss carryforward -- Unrealized losses--net (945,506) --------------- Total accumulated losses--net $ (689,736) =============== As of June 30, 2007, there were no significant differences between the book and tax components of net assets. 7. Acquisition of BlackRock UltraShort Municipal Portfolio, a portfolio of BlackRock Funds: On October 16, 2006, BlackRock Short-Term Municipal Fund of the Bond Fund (the "Fund") acquired all of the net assets of BlackRock Ultra Short Municipal Portfolio ("Ultra Short"), pursuant to a plan of reorganization. The acquisition was accomplished by a tax-free exchange of 722,400 shares of common stock of Ultra Short for 1,817,473 shares of the Fund. Ultra Short's net assets on that date of $18,029,524, including $130,270 of accumulated net realized losses and $28,132 of net unrealized depreciation were combined with those of the Fund. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Report of Independent Registered Public Accounting Firm To the Shareholders and Board of Directors of BlackRock Municipal Bond Fund, Inc.: We have audited the accompanying statements of assets and liabilities, including the schedules of investments, of BlackRock Short-Term Municipal Bond Fund, BlackRock Municipal Insured Fund and BlackRock National Municipal Fund (formerly Short-Term Portfolio, Insured Portfolio and National Portfolio, respectively), three of the portfolios constituting BlackRock Municipal Bond Fund, Inc. (the "Bond Fund") (formerly Merrill Lynch Municipal Bond Fund, Inc.), as of June 30, 2007, and the related statements of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, and the financial highlights for each of the five years in the period then ended. We have also audited the accompanying statement of assets and liabilities, including the schedule of investments, of BlackRock High Yield Municipal Fund, one of the portfolios constituting the Bond Fund, as of June 30, 2007, and the related statement of operations, statement of changes in net assets and financial highlights for the period August 1, 2006 (commencement of operations) through June 30, 2007. These financial statements and financial highlights are the responsibility of the Bond Fund's management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. The Bond Fund is not required to have, nor were we engaged to perform, an audit of their internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Bond Fund's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of June 30, 2007, by correspondence with the custodian and brokers; where replies were not received from brokers, we performed other auditing procedures. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the respective financial positions of BlackRock Short-Term Municipal Bond Fund, BlackRock Municipal Insured Fund, and BlackRock National Municipal Fund, each a portfolio of BlackRock Municipal Bond Fund, Inc., as of June 30, 2007, the results of their operations for the year then ended, the changes in their net assets for each of the two years in the period then ended, and their financial highlights for each of the five years in the period then ended, and the financial position of BlackRock High Yield Municipal Fund, one of the portfolios constituting BlackRock Municipal Bond Fund, Inc., as of June 30, 2007, the results of its operations, the changes in its net assets and its financial highlights for the period August 1, 2006 through June 30, 2007, in conformity with accounting principles generally accepted in the United States of America. Deloitte & Touche LLP Princeton, New Jersey August 27, 2007 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Officers and Directors Number of Funds and Portfolios in Other Public Position(s) Length of Fund Complex Directorships Held with Time Overseen by Held by Name, Address & Age Fund Served Principal Occupation(s) During Past 5 Years Director Director Interested Director Robert C. Doll, Jr.* Fund 2005 to Vice Chairman and Director of BlackRock, Inc., 121 Funds None P.O. Box 9011 President present Global Chief Investment Officer for Equities, 161 Portfolios Princeton, and Chairman of the BlackRock Retail Operating NJ 08543-9011 Director Committee, and member of the BlackRock Age: 52 Executive Committee since 2006; President of the funds advised by Merrill Lynch Investment Managers, L.P. ("MLIM") and its affiliates ("MLIM/FAM-advised funds") from 2005 to 2006 and Chief Investment Officer thereof from 2001 to 2006; President of MLIM and Fund Asset Management, L.P. ("FAM") from 2001 to 2006; Co-Head (Americas Region) thereof from 2000 to 2001 and Senior Vice President from 1999 to 2001; President and Director of Princeton Services, Inc. ("Princeton Services") and President of Princeton Administrators, L.P. ("Princeton Administrators") from 2001 to 2006; Chief Investment Officer of OppenheimerFunds, Inc. in 1999 and Executive Vice President thereof from 1991 to 1999. * Mr. Doll is a director, trustee or member of an advisory board of certain other investment companies for which BlackRock Advisors, LLC and its affiliates act as investment adviser. Mr. Doll is an "interested person," as defined in the Investment Company Act, of the Fund based on his positions with BlackRock, Inc. and its affiliates. Directors serve until their resignation, removal or death, or until December 31 of the year in which they turn 72. As Fund President, Mr. Doll serves at the pleasure of the Board of Directors. Independent Directors* Ronald W. Forbes** Director 1997 to Professor Emeritus of Finance, School of 46 Funds None P.O. Box 9095 present Business, State University of New York at 48 Portfolios Princeton, Albany since 2000 and Professor thereof NJ 08543-9095 from 1989 to 2000; International Consultant, Age: 66 Urban Institute, Washington D.C. from 1995 to 1999. Cynthia A. Montgomery Director 1994 to Professor, Harvard Business School since 46 Funds Newell P.O. Box 9095 present 1989; Associate Professor, J.L. Kellogg 48 Portfolios Rubbermaid, Inc. Princeton, Graduate School of Management, Northwestern (manufacturing) NJ 08543-9095 University from 1985 to 1989; Associate Age: 54 Professor, Graduate School of Business Administration, University of Michigan from 1979 to 1985; Director, Harvard Business School Publishing since 2005; Director, McLean Hospital since 2005. Jean Margo Reid Director 2004 to Self-employed consultant since 2001; 46 Funds None P.O. Box 9095 present Counsel of Alliance Capital Management 48 Portfolios Princeton, (investment adviser) in 2000; General NJ 08543-9095 Counsel, Director and Secretary of Sanford Age: 61 C. Bernstein & Co., Inc. (investment adviser/broker-dealer) from 1997 to 2000; Secretary, Sanford C. Bernstein Fund, Inc. from 1994 to 2000; Director and Secretary of SCB, Inc. since 1998; Director and Secretary of SCB Partners, Inc. since 2000; and Director of Covenant House from 2001 to 2004. * Directors serve until their resignation, removal or death, or until December 31 of the year in which they turn 72. ** Chairman of the Board of Directors and the Audit Committee. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Officers and Directors (concluded) Number of Funds and Portfolios in Other Public Position(s) Length of Fund Complex Directorships Held with Time Overseen by Held by Name, Address & Age Fund Served Principal Occupation(s) During Past 5 Years Director Director Independent Directors* (concluded) Roscoe S. Suddarth Director 2000 to President, Middle East Institute, from 46 Funds None P.O. Box 9095 present 1995 to 2001; Foreign Service Officer, 48 Portfolios Princeton, United States Foreign Service, from 1961 NJ 08543-9095 to 1995 and Career Minister from 1989 to Age: 71 1995; Deputy Inspector General, U.S. Department of State, from 1991 to 1994; U.S. Ambassador to the Hashemite Kingdom of Jordan from 1987 to 1990. Richard R. West Director 1981 to Professor of Finance from 1984 to 1995, 46 Funds Bowne & Co., P.O. Box 9095 present Dean from 1984 to 1993 and since 1995 48 Portfolios Inc. (financial Princeton, Dean Emeritus of New York University's printers); NJ 08543-9095 Leonard N. Stern School of Business Vornado Realty Age: 69 Administration. Trust (real estate company); Alexander's, Inc. (real estate company) * Directors serve until their resignation, removal or death, or until December 31 of the year in which they turn 72. Position(s) Length of Held with Time Name, Address & Age Fund Served Principal Occupation(s) During Past 5 Years Fund Officers* Donald C. Burke Vice 1993 to Managing Director of BlackRock, Inc. since 2006; Managing Director of Merrill P.O. Box 9011 President present Lynch Investment Managers, L.P. ("MLIM") and Fund Asset Management, L.P. ("FAM") Princeton, and and in 2006; First Vice President of MLIM and FAM from 1997 to 2005 and Treasurer NJ 08543-9011 Treasurer 1999 to thereof from 1999 to 2006; Vice President of MLIM and FAM from 1990 to 1997. Age: 47 present Karen Clark Fund Chief 2007 to Managing Director of BlackRock, Inc. and Chief Compliance Officer of certain P.O. Box 9011 Compliance present BlackRock-advised funds since 2007; Director of BlackRock, Inc. from 2005 to 2007; Princeton, Officer Principal and Senior Compliance Officer, State Street Global Advisors, from 2001 NJ 08543-9011 to 2005; Principal Consultant, PricewaterhouseCoopers, LLP from 1998 to 2001; Age: 42 and Branch Chief, Division of Investment Management and Office of Compliance Inspections and Examinations, U.S. Securities and Exchange Commission, from 1993 to 1998. Alice A. Pellegrino Secretary 2004 to Director of BlackRock, Inc. since 2006; Director (Legal Advisory) of MLIM from P.O. Box 9011 present 2002 to 2006; Vice President of MLIM from 1999 to 2002; Attorney associated with Princeton, MLIM from 1997 to 1999; Secretary of MLIM, FAM, FAM Distributors, Inc. and NJ 08543-9011 Princeton Services from 2004 to 2006. Age: 47 * Officers of the Fund serve at the pleasure of the Board of Directors. Further information about the Fund's Officers and Directors is available in the Fund's Statement of Additional Information, which can be obtained without charge by calling 1-800-441-7762. Custodian The Bank of New York 100 Church Street New York, NY 10286 Transfer Agent PFPC Inc. Wilmington, DE 19809 BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 BlackRock Funds BlackRock Privacy Principles BlackRock is committed to maintaining the privacy of its current and former fund investors and individual clients (collectively, "Clients") and to safeguarding their non-public personal information. The following information is provided to help you understand what personal information BlackRock collects, how we protect that information and why in certain cases we share such information with select parties. If you are located in a jurisdiction where specific laws, rules or regulations require BlackRock to provide you with additional or different privacy-related rights beyond what is set forth below, then BlackRock will comply with those specific laws, rules or regulations. BlackRock obtains or verifies personal non-public information from and about you from different sources, including the following: (i) information we receive from you or, if applicable, your financial intermediary, on applications, forms or other documents; (ii) information about your transactions with us, our affiliates, or others; (iii) information we receive from a consumer reporting agency; and (iv) from visits to our Web sites. BlackRock does not sell or disclose to non-affiliated third parties any non-public personal information about its Clients, except as permitted by law or as is necessary to respond to regulatory requests or to service Client accounts. These non-affiliated third parties are required to protect the confidentiality and security of this information and to use it only for its intended purpose. We may share information with our affiliates to service your account or to provide you with information about other BlackRock products or services that may be of interest to you. In addition, BlackRock restricts access to non- public personal information about its Clients to those BlackRock employees with a legitimate business need for the information. BlackRock maintains physical, electronic and procedural safeguards that are designed to protect the non-public personal information of its Clients, including procedures relating to the proper storage and disposal of such information. Availability of Additional Information Electronic copies of most financial reports and prospectuses are available on the Bond Fund's Web site or shareholders can sign up for e-mail notifications of quarterly statements, annual and semi-annual reports and prospectuses by enrolling in the Bond Fund's electronic delivery program. To enroll: Shareholders Who Hold Accounts with Investment Advisers, Banks or Brokerages: Please contact your financial advisor. Please note that not all investment advisers, banks or brokerages may offer this service. Shareholders Who Hold Accounts Directly with BlackRock: 1) Access the BlackRock Web site at http://www.blackrock.com/edelivery 2) Select eDelivery under the More Information section 3) Log into your account The Bond Fund will mail only one copy of shareholder documents, including prospectuses, annual and semi-annual reports and proxy statements, to shareholders with multiple accounts at the same address. This practice is commonly called "householding" and it is intended to reduce expenses and eliminate duplicate mailings of shareholder documents. Mailings of your shareholder documents may be householded indefinitely unless you instruct us otherwise. If you do not want the mailing of these documents to be combined with those for other members of your household, please contact the Bond Fund at (800) 441-7762. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 BlackRock Funds (concluded) Availability of Additional Information (concluded) Availability of Proxy Voting Policies and Procedures The Bond Fund has delegated proxy voting responsibilities to BlackRock and its affiliates, subject to the general oversight of the Bond Fund's Board of Directors. A description of the policies and procedures that BlackRock and its affiliates use to determine how to vote proxies relating to portfolio securities is available without charge, upon request, on our Web site at www.blackrock.com, by calling (800) 441-7762, or on the Web site of the Securities and Exchange Commission (the "Commission") at http://www.sec.gov. Availability of Proxy Voting Record Information on how proxies relating to the Bond Fund's voting securities were voted (if any) by BlackRock during the most recent 12-month period ended June 30 is available, upon request and without charge, on our Web site at www.blackrock.com, by calling (800) 441-7762 or on the Web site of the Commission at http://www.sec.gov. Availability of Quarterly Portfolio Schedule The Bond Fund files its complete schedule of portfolio holdings for the first and third quarters of its fiscal year with the Commission on Form N-Q. The Fund's Forms N-Q are avail-able on the Commission's Web site at http://www.sec.gov and may be reviewed and copied at the Commission's Public Reference Room in Washington, D.C. Information regarding the operation of the Public Reference Room may be obtained by calling (800) SEC-0330. The Bond Fund's Forms N-Q may also be obtained upon request, without charge, by calling (800) 441-7762. Shareholder Privileges Account Information Call us at (800) 441-7762 8:00 AM - 6:00 PM EST to get information about your account balances, recent transactions and share prices. You can also reach us on the Web at www.blackrock.com. Automatic Investment Plans Investor Class shareholders who want to invest regularly can arrange to have $50 or more automatically deducted from their checking or savings account and invested in any of the BlackRock funds. Systematic Withdrawal Plans Investor Class shareholders can establish a systematic withdrawal plan and receive periodic payments of $50 or more from their BlackRock funds, as long as their account is at least $10,000. Retirement Plans Shareholders may make investments in conjunction with Traditional, Rollover, Roth, Coverdell, Simple IRAs, SEP IRAs and 403(b) Plans. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 A World-Class Mutual Fund Family BlackRock offers a diverse lineup of open-end mutual funds crossing all investment styles and managed by experts in equity, fixed income and tax-exempt investing. Equity Funds BlackRock All-Cap Global Resources Portfolio BlackRock Aurora Portfolio BlackRock Asset Allocation Portfolio++ BlackRock Balanced Capital Fund++ BlackRock Basic Value Fund BlackRock Capital Appreciation Portfolio BlackRock Developing Capital Markets Fund BlackRock Equity Dividend Fund BlackRock EuroFund BlackRock Focus Twenty Fund BlackRock Focus Value Fund BlackRock Fundamental Growth Fund BlackRock Global Allocation Fund++ BlackRock Global Dynamic Equity Fund BlackRock Global Financial Services Fund BlackRock Global Growth Fund BlackRock Global Opportunities Portfolio BlackRock Global Resources Portfolio* BlackRock Global Science & Technology Opportunities Portfolio BlackRock Global SmallCap Fund BlackRock Healthcare Fund BlackRock Health Sciences Opportunities Portfolio BlackRock Index Equity Portfolio* BlackRock International Fund BlackRock International Index Fund BlackRock International Opportunities Portfolio* BlackRock International Value Fund BlackRock Investment Trust BlackRock Large Cap Core Fund BlackRock Large Cap Growth Fund BlackRock Large Cap Value Fund BlackRock Latin America Fund BlackRock Mid-Cap Growth Equity Portfolio BlackRock Mid-Cap Value Equity Portfolio BlackRock Mid Cap Value Opportunities Fund BlackRock Natural Resources Trust BlackRock Pacific Fund BlackRock Small Cap Core Equity Portfolio BlackRock Small Cap Growth Equity Portfolio BlackRock Small Cap Growth Fund II BlackRock Small Cap Index Fund BlackRock Small Cap Value Equity Portfolio* BlackRock Small/Mid-Cap Growth Portfolio BlackRock S&P 500 Index Fund BlackRock Technology Fund BlackRock U.S. Opportunities Portfolio BlackRock Utilities and Telecommunications Fund BlackRock Value Opportunities Fund Fixed Income Funds BlackRock Bond Fund BlackRock Commodity Strategies Fund BlackRock Enhanced Income Portfolio BlackRock GNMA Portfolio BlackRock Government Income Portfolio BlackRock High Income Fund BlackRock High Yield Bond Portfolio BlackRock Inflation Protected Bond Portfolio BlackRock Intermediate Bond Portfolio II BlackRock Intermediate Government Bond Portfolio BlackRock International Bond Portfolio BlackRock Low Duration Bond Portfolio BlackRock Managed Income Portfolio BlackRock Short-Term Bond Fund BlackRock Total Return Portfolio BlackRock Total Return Portfolio II BlackRock World Income Fund Municipal Bond Funds BlackRock AMT-Free Municipal Bond Portfolio BlackRock California Insured Municipal Bond Fund BlackRock Delaware Municipal Bond Portfolio BlackRock Florida Municipal Bond Fund BlackRock High Yield Municipal Fund BlackRock Intermediate Municipal Fund BlackRock Kentucky Municipal Bond Portfolio BlackRock Municipal Insured Fund BlackRock National Municipal Fund BlackRock New Jersey Municipal Bond Fund BlackRock New York Municipal Bond Fund BlackRock Ohio Municipal Bond Portfolio BlackRock Pennsylvania Municipal Bond Fund BlackRock Short-Term Municipal Fund Target Risk & Target Date Funds BlackRock Prepared Portfolios Conservative Prepared Portfolio Moderate Prepared Portfolio Growth Prepared Portfolio Aggressive Growth Prepared Portfolio BlackRock Lifecycle Prepared Portfolios Prepared Portfolio 2010 Prepared Portfolio 2015 Prepared Portfolio 2020 Prepared Portfolio 2025 Prepared Portfolio 2030 Prepared Portfolio 2035 Prepared Portfolio 2040 Prepared Portfolio 2045 Prepared Portfolio 2050 * See the prospectus for information on specific limitations on investments in the fund. ++ Mixed asset fund. BlackRock mutual funds are distributed by BlackRock Distributors, Inc. and certain funds are also distributed by FAM Distributors, Inc. You should consider the investment objectives, risks, charges and expenses of the funds under consideration carefully before investing. Each fund's prospectus contains this and other information and is available at www.blackrock.com or by calling 800-882-0052 or from your financial advisor. The prospectus should be read carefully before investing. BLACKROCK MUNICIPAL BOND FUND, INC. JUNE 30, 2007 Item 2 - Code of Ethics - The registrant has adopted a code of ethics, as of the end of the period covered by this report, that applies to the registrant's principal executive officer, principal financial officer and principal accounting officer, or persons performing similar functions. A copy of the code of ethics is available without charge at www.blackrock.com. Item 3 - Audit Committee Financial Expert - The registrant's board of directors has determined that (i) the registrant has the following audit committee financial experts serving on its audit committee and (ii) each audit committee financial expert is independent: (1) Ronald W. Forbes, (2) Richard R. West, and (3) Edward D. Zinbarg (retired as of December 31, 2006). Item 4 - Principal Accountant Fees and Services BlackRock Municipal Insured Fund (a) Audit Fees - Fiscal Year Ended June 30, 2007 - $56,450 Fiscal Year Ended June 30, 2006 - $31,600 (b) Audit-Related Fees - Fiscal Year Ended June 30, 2007 - $0 Fiscal Year Ended June 30, 2006 - $0 (c) Tax Fees - Fiscal Year Ended June 30, 2007 - $6,100 Fiscal Year Ended June 30, 2006 - $6,000 The nature of the services include tax compliance, tax advice and tax planning. (d) All Other Fees - Fiscal Year Ended June 30, 2007 - $0 Fiscal Year Ended June 30, 2006 - $0 BlackRock National Municipal Fund (a) Audit Fees - Fiscal Year Ended June 30, 2007 - $56,450 Fiscal Year Ended June 30, 2006 - $31,600 (b) Audit-Related Fees - Fiscal Year Ended June 30, 2007 - $0 Fiscal Year Ended June 30, 2006 - $0 (c) Tax Fees - Fiscal Year Ended June 30, 2007 - $6,100 Fiscal Year Ended June 30, 2006 - $6,000 The nature of the services include tax compliance, tax advice and tax planning. (d) All Other Fees - Fiscal Year Ended June 30, 2007 - $0 Fiscal Year Ended June 30, 2006 - $0 BlackRock Short-Term Municipal Fund (a) Audit Fees - Fiscal Year Ended June 30, 2007 - $27,500 Fiscal Year Ended June 30, 2006 - $27,500 (b) Audit-Related Fees - Fiscal Year Ended June 30, 2007 - $0 Fiscal Year Ended June 30, 2006 - $15,400 The nature of the services include assurance and related services reasonably related to the performance of the audit of financial statements not included in Audit Fees. (c) Tax Fees - Fiscal Year Ended June 30, 2007 - $6,100 Fiscal Year Ended June 30, 2006 - $6,000 The nature of the services include tax compliance, tax advice and tax planning. (d) All Other Fees - Fiscal Year Ended June 30, 2007 - $0 Fiscal Year Ended June 30, 2006 - $0 BlackRock High Yield Municipal Fund (a) Audit Fees - Fiscal Year Ended June 30, 2007 - $37,600 Fiscal Year Ended June 30, 2006 - N/A (b) Audit-Related Fees - Fiscal Year Ended June 30, 2007 - $0 Fiscal Year Ended June 30, 2006 - N/A (c) Tax Fees - Fiscal Year Ended June 30, 2007 - $6,100 Fiscal Year Ended June 30, 2006 - N/A The nature of the services include tax compliance, tax advice and tax planning. (d) All Other Fees - Fiscal Year Ended June 30, 2007 - $0 Fiscal Year Ended June 30, 2006 - N/A (e)(1) The registrant's audit committee (the "Committee") has adopted policies and procedures with regard to the pre-approval of services. Audit, audit-related and tax compliance services provided to the registrant on an annual basis require specific pre-approval by the Committee. The Committee also must approve other non-audit services provided to the registrant and those non-audit services provided to the registrant's affiliated service providers that relate directly to the operations and the financial reporting of the registrant. Certain of these non-audit services that the Committee believes are a) consistent with the SEC's auditor independence rules and b) routine and recurring services that will not impair the independence of the independent accountants may be approved by the Committee without consideration on a specific case-by-case basis ("general pre-approval"). However, such services will only be deemed pre-approved provided that any individual project does not exceed $5,000 attributable to the registrant or $50,000 for all of the registrants the Committee oversees. Any proposed services exceeding the pre-approved cost levels will require specific pre- approval by the Committee, as will any other services not subject to general pre-approval (e.g., unanticipated but permissible services). The Committee is informed of each service approved subject to general pre-approval at the next regularly scheduled in-person board meeting. (e)(2) 0% (f) Not Applicable (g) BlackRock Municipal Insured Fund Fiscal Year Ended June 30, 2007 - $2,967,000 Fiscal Year Ended June 30, 2006 - $2,815,800 BlackRock National Municipal Fund Fiscal Year Ended June 30, 2007 - $2,967,000 Fiscal Year Ended June 30, 2006 - $2,815,800 BlackRock Short-Term Municipal Fund Fiscal Year Ended June 30, 2007 - $2,967,000 Fiscal Year Ended June 30, 2006 - $2,831,200 BlackRock High Yield Municipal Fund Fiscal Year Ended June 30, 2007 - $2,967,000 Fiscal Year Ended June 30, 2006 - $2,809,800 (h) The registrant's audit committee has considered and determined that the provision of non-audit services that were rendered to the registrant's investment adviser and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant that were not pre- approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. Regulation S-X Rule 2-01(c)(7)(ii) - $1,735,000, 0% Item 5 - Audit Committee of Listed Registrants - Not Applicable Item 6 - Schedule of Investments - The registrant's Schedule of Investments is included as part of the Report to Stockholders filed under Item 1 of this form. Item 7 - Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies - Not Applicable Item 8 - Portfolio Managers of Closed-End Management Investment Companies - Not Applicable Item 9 - Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers - Not Applicable Item 10 - Submission of Matters to a Vote of Security Holders - The registrant's Nominating Committee will consider nominees to the Board recommended by shareholders when a vacancy becomes available. Shareholders who wish to recommend a nominee should send nominations which include biographical information and set forth the qualifications of the proposed nominee to the registrant's Secretary. There have been no material changes to these procedures. Item 11 - Controls and Procedures 11(a) - The registrant's principal executive and principal financial officers or persons performing similar functions have concluded that the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the "1940 Act")) are effective as of a date within 90 days of the filing of this report based on the evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act and Rule 15d-15(b) under the Securities and Exchange Act of 1934, as amended. 11(b) - There were no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17 CFR 270.30a-3(d)) that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. Item 12 - Exhibits attached hereto 12(a)(1) - Code of Ethics - See Item 2 12(a)(2) - Certifications - Attached hereto 12(a)(3) - Not Applicable 12(b) - Certifications - Attached hereto Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. BlackRock Municipal Bond Fund, Inc. By: /s/ Robert C. Doll, Jr. ----------------------- Robert C. Doll, Jr., Chief Executive Officer of BlackRock Municipal Bond Fund, Inc. Date: August 20, 2007 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By: /s/ Robert C. Doll, Jr. ----------------------- Robert C. Doll, Jr., Chief Executive Officer of BlackRock Municipal Bond Fund, Inc. Date: August 20, 2007 By: /s/ Donald C. Burke ------------------- Donald C. Burke, Chief Financial Officer of BlackRock Municipal Bond Fund, Inc. Date: August 20, 2007