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 811-4375

Name of Fund: Merrill Lynch Pennsylvania Municipal Bond Fund
              of Merrill Lynch Multi-State Municipal Series Trust

Fund Address: P.O. Box 9011
              Princeton, NJ 08543-9011

Name and address of agent for service: Terry K. Glenn, President, Merrill Lynch
      Pennsylvania Municipal Bond Fund, 800 Scudders Mill Road, Plainsboro, NJ,
      08536. Mailing address: P.O. Box 9011, Princeton, NJ, 08543-9011

Registrant's telephone number, including area code: (609) 282-2800

Date of fiscal year end: 07/31/03

Date of reporting period: 08/01/02 - 07/31/03

Item 1 - Attach shareholder report


[LOGO] Merrill Lynch Investment Managers                         www.mlim.ml.com

                                        Merrill Lynch
                                        Pennsylvania Municipal
                                        Bond Fund

Annual Report
July 31, 2003



[LOGO] Merrill Lynch Investment Managers

Merrill Lynch Pennsylvania Municipal Bond Fund

Important Tax Information (unaudited)

All of the net investment income distributions paid monthly by Merrill Lynch
Pennsylvania Municipal Bond Fund during its taxable year ended July 31, 2003
qualify as tax-exempt interest dividends for Federal income tax purposes.

Please retain this information for your records.

Electronic Delivery

The Fund is now offering electronic delivery of communications to its
shareholders. In order to receive this service, you must register your account
and provide us with e-mail information. To sign up for this service, simply
access this website http://www.icsdelivery.com/live and follow the instructions.
When you visit this site, you will obtain a personal identification number
(PIN). You will need this PIN should you wish to update your e-mail address,
choose to discontinue this service and/or make any other changes to the service.
This service is not available for certain retirement accounts at this time.


2      MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003


A Letter From the President

Dear Shareholder

Now more than half behind us, 2003 has been a meaningful year in many respects.
Perhaps the most significant development was the conclusion of all-out war in
Iraq. Although not especially sensitive to geopolitical events, the municipal
market has not been exempt from the general market excitement we have seen since
fighting gave way to restructuring in Iraq.

Municipal bond yields rose and fell in response to war fears, equity market
uncertainty, sub par economic growth, unemployment and deflation. By the end of
July, long-term municipal revenue bond yields stood at 5.4%, as measured by the
Bond Buyer Revenue Bond Index. With many state deficits at record levels,
municipalities issued more than $200 billion in new long-term tax-exempt bonds
during the six-month period ended July 31, 2003, an increase of more than 20%
versus the same six months of 2002. The availability of bonds, together with
attractive yield ratios relative to U.S. Treasury issues, made municipal bonds a
popular fixed income investment alternative.

Against this backdrop, our portfolio managers continued to work diligently to
deliver on our commitment to provide superior performance within reasonable
expectations for risk and return. This included striving to outperform our peers
and the market indexes. With that said, remember also that the advice and
guidance of a skilled financial advisor can mean the difference between fruitful
and fruitless investing. A financial professional can help you choose those
investments that will best serve you as you plan for your financial future.

Finally, I am proud to premiere a new look to our shareholder communications.
Our portfolio manager commentaries have been trimmed and organized in such a way
that you can get the information you need at a glance, in plain language.
Today's markets are confusing enough. We want to help you put it all in
perspective. The report's new size also allows us certain mailing efficiencies.
The cost savings in both production and postage are passed on to the fund and,
ultimately, to fund shareholders.

We thank you for trusting Merrill Lynch Investment Managers with your investment
assets, and we look forward to serving you in the months and years ahead.

                                                Sincerely,


                                                /s/ Terry K. Glenn

                                                Terry K. Glenn
                                                President and Trustee


       MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003       3


[LOGO] Merrill Lynch Investment Managers

A Discussion With Your Fund's Portfolio Manager

      The Fund performed favorably during the period, primarily because we took
advantage of derivative products and hedging strategies to enhance total return.

Discuss the recent market environment relative to municipal bonds.

Amid considerable interest rate volatility, U.S. Treasury bond yields were
higher at 5.35% at the end of July, 2003 than they had been six months earlier.
Volatile equity markets, concerns over the Iraqi conflict, and sub par economic
growth combined to generally push interest rates lower through June. Bond
yields, however, moved sharply higher in July in response to more positive
business activity, especially continued strong homes sales and improving
employment trends.

Long-term tax-exempt bond yields also rose over the six months ended July 31,
2003, although to a lesser extent than U.S. Treasury obligations. Yield
volatility was lower than that seen in U.S. Treasury issues, as municipal bond
prices typically are less sensitive to worldwide geopolitical pressures on a
daily and weekly basis. By the end of July, long-term municipal revenue bond
yields, as measured by the Bond Buyer Revenue Bond Index, stood at 5.4%.

The municipal market outperformed the U.S. Treasury market over the past six
months, despite a dramatic increase in new bond issuance. Recent semi-annual
issuance has, in fact, exceeded the annual issuance seen during much of the
mid-1990s. The monthly issuance for July 2003, at almost $30 billion,
represented the largest amount of tax-exempt bonds ever sold in the month of
July. Historically low interest rates over the past year have been used by state
and local governments as an opportunity to finance existing infrastructure needs
and refinance outstanding, higher-coupon issues. Current estimates for 2003
municipal bond new issuance are approximately $350 billion, similar to 2002's
record high issuance.

A number of factors continue to foster strong investor demand for municipal
bonds. Tax-exempt money market rates have remained below 1% for much of this
year, forcing investors to invest in longer maturities to generate desired
levels of coupon income. In July and August 2003, investors are expected to
receive approximately $60 billion in coupon income, bond maturities and the
proceeds from early redemptions. We believe much of these proceeds are likely to
be reinvested in the municipal market.

As an asset class, municipal bonds have remained an attractive investment
alternative, especially relative to U.S. Treasury issues. At the end of July
2003, tax-exempt bond yields were 85% - 93% of comparable U.S. Treasury issues,
well in excess of their historic average of 82% - 88%. Current yield ratios have
made municipal securities attractive to both retail and institutional investors.
We expect the tax-exempt market's favorable technical position to remain stable
in the near term, therefore, an increase in bond issuance during the remainder
of 2003 is not likely to significantly impact the municipal bond market's
performance.

While many investors are concerned about how economic growth might affect bond
prices and yield, we believe moderate economic growth, especially within a
context of negligible inflationary pressures, should not greatly endanger the
positive fixed income environments tax-exempt products have enjoyed.

What developments in the commonwealth of Pennsylvania impacted the Fund?

The commonwealth is in the process of addressing its budget shortage, and
appears to have it well in hand. We do not expect any drama to come of the
current budget proposal. The economic condition of the state essentially is no
worse than that of the nation. If anything, it is slightly better. In fact,
going into the recession, we believe Pennsylvania was in a better position than
most states. This relative stability, coupled with low Pennsylvania issuance,
has forced the Fund to maintain low cash reserves in order to maintain a
competitive yield.

How did the Fund perform during the fiscal year?

For the 12-month period ended July 31, 2003, the Fund's Class A, Class B, Class
C and Class I Shares had total returns of +3.69%, +3.18%, +3.07% and +3.69%,
respectively, performing in line with the +3.60% return of the unmanaged
benchmark Lehman Brothers Municipal Bond Index for the same period. The Fund
outperformed its Lipper peer group of Pennsylvania Municipal Debt Funds, which
had


4      MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003


an average return of +2.80% during the 12-month period. (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 6 - 8 of this report to
shareholders.)

The Fund's strong performance is attributed to two investment strategies that we
introduced in April 2003. First, we took advantage of the yield potential
offered by derivative products. At the close of the fiscal year, approximately
13% - 14% of the portfolio's assets were invested in derivatives. Second, we
hedged the Fund approximately 15% in 20-year BMA (Bond Market Association) swaps
and about 2% in ten-year London Interbank Offered Rate (LIBOR) swaps. The market
was somewhat volatile over the past six months, with higher yields at the end of
the period than at the beginning. The hedging strategy served to protect the
portfolio by reducing the volatility in a down market. It also kept us from
having to raise our cash reserves, which would have had a negative impact on the
Fund's distribution yield.

What changes were made to the portfolio during the period?

We had some major bonds called during the fiscal year. Approximately 5% of the
Fund's assets were called, whereby we had to fill the voids and continue
generating yield. Other than the hedging strategies noted earlier, we saw little
activity during the period. There has been a lack of Pennsylvania bonds
available in the longer maturities that we have been looking to buy. In July, we
collapsed a derivative position that had a maturity date of July 1, 2017, in
anticipation of purchasing a longer-maturity Pennsylvania Turnpike issue that we
intend to establish as a new derivative position with a higher yield.

How would you characterize the Fund's position at the close of the period?

We believe the Fund remains in a favorable position. Overall, we are working to
increase yield while reducing volatility. We maintained our emphasis on the
hedging strategies and, with the unwinding of one of our derivatives, we expect
to see a slight pickup in yield as well as lower volatility. We continue to
search for the most attractive investment opportunities the commonwealth has to
offer, aiming to take advantage of any market downturns.

William R. Bock
Vice President and Portfolio Manager

August 13, 2003

- --------------------------------------------------------------------------------
Effective April 14, 2003, the share class names for the Merrill Lynch family of
mutual funds were changed to be consistent with the standard share classes of
most other mutual fund families. As of that date, all Class A Shares were
redesignated Class I Shares. At the same time, Class D Shares were redesignated
Class A Shares. There are no changes to the Class B or Class C share class
labels. Trading symbols have not changed nor have current eligibility rules or
pricing structures. This redesignation of share classes does not impact your
investment in any way.
- --------------------------------------------------------------------------------


       MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003       5


[LOGO] Merrill Lynch Investment Managers

Performance Data

About Fund Performance

Effective April 14, 2003, Class A Shares were redesignated Class I Shares and
Class D Shares were redesignated Class A Shares. Investors are able to purchase
shares of the Fund through multiple pricing alternatives:

o     Class A Shares incur a maximum initial sales charge of 4% and an account
      maintenance fee of 0.10% (but no distribution fee).

o     Effective December 1, 2002, Class B Shares are subject to a maximum
      contingent deferred sales charge of 4%, declining to 0% after six years.
      All Class B Shares purchased prior to December 1, 2002 will maintain the
      four-year schedule. In addition, Class B Shares are subject to a
      distribution fee of 0.25% and an account maintenance fee of 0.25%. These
      shares automatically convert to Class A Shares after approximately ten
      years. (There is no initial sales charge for automatic share conversions.)

o     Class C Shares are subject to a distribution fee of 0.35% and an account
      maintenance fee of 0.25%. In addition, Class C Shares are subject to a 1%
      contingent deferred sales charge if redeemed within one year of purchase.

o     Class I Shares incur a maximum initial sales charge (front-end load) of 4%
      and bear no ongoing distribution or account maintenance fees. Class I
      Shares are available only to eligible investors.

None of the past results shown should be considered a representation of future
performance. 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 gains distributions 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 account maintenance, distribution and transfer agency fees applicable to each
class, which are deducted from the income available to be paid to shareholders.

Recent Performance Results



                                                                                      Ten-Year/
                                                         6-Month       12-Month    Since Inception    Standardized
As of July 31, 2003                                   Total Return   Total Return    Total Return     30-Day Yield
==================================================================================================================
                                                                                             
ML Pennsylvania Municipal Bond Fund Class A Shares*       +1.08%        +3.69%          +67.83%          3.69%
- ------------------------------------------------------------------------------------------------------------------
ML Pennsylvania Municipal Bond Fund Class B Shares*       +0.79         +3.18           +61.73           3.43
- ------------------------------------------------------------------------------------------------------------------
ML Pennsylvania Municipal Bond Fund Class C Shares*       +0.74         +3.07           +60.22           3.33
- ------------------------------------------------------------------------------------------------------------------
ML Pennsylvania Municipal Bond Fund Class I Shares*       +1.03         +3.69           +70.13           3.79
- ------------------------------------------------------------------------------------------------------------------
Lehman Brothers Municipal Bond Index**                    +0.43         +3.60       +78.78/+80.70          --
- ------------------------------------------------------------------------------------------------------------------


*     Investment results shown do not reflect sales charges; results would be
      lower if a sales charge was included. 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. The Fund's ten-year / since inception periods
      are ten years for Class B & Class I Shares and from 10/21/94 for Class A &
      Class C Shares.

**    This unmanaged Index consists of long-term revenue bonds, prerefunded
      bonds, general obligation bonds and insured bonds. Ten-year/since
      inception total returns are for ten years and from 10/31/94, respectively.


6      MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003


Performance Data (continued)

ML Pennsylvania Municipal Bond Fund's Class A and Class C Shares--Total Return
Based on a $10,000 Investment

A line graph depicting the growth of an investment in the Portfolio's Class A
and Class C Shares compared to growth of an investment in the Lehman Brothers
Municipal Bond Index. Values are from October 21, 1994 to July 2003:



                                    10/21/94**       7/95              7/96             7/97              7/98             7/99
                                                                                                         
ML Pennsylvania
Municipal Bond Fund+--
Class A Shares*                     $ 9,600          $10,404           $11,070          $12,135           $12,860          $13,028

ML Pennsylvania
Municipal Bond Fund+--
Class C Shares*                     $10,000          $10,784           $11,417          $12,451           $13,129          $13,221


                                    7/00             7/01              7/02             7/03
                                                                            
ML Pennsylvania
Municipal Bond Fund+--
Class A Shares*                     $13,323          $14,590           $15,538          $16,112

ML Pennsylvania
Municipal Bond Fund+--
Class C Shares*                     $13,463          $14,670           $15,545          $16,022


                                    10/31/94         7/95              7/96             7/97              7/98             7/99
                                                                                                         
Lehman Brothers Municipal
Bond Index++                        $10,000          $11,107           $11,840          $13,054           $13,837          $14,235


                                    7/00             7/01              7/02             7/03
                                                                            
Lehman Brothers Municipal
Bond Index++                        $14,848          $16,345           $17,441          $18,070


*     Assuming maximum sales charge, transaction costs and other operating
      expenses, including advisory fees.

**    Commencement of operations.

+     ML Pennsylvania Municipal Bond Fund invests primarily in long-term
      investment-grade obligations issued by or on behalf of the Commonwealth of
      Pennsylvania, its political subdivisions, agencies and instrumentalities
      and obligations of other qualifying issuers.

++    This unmanaged Index consists of long-term revenue bonds, prerefunded
      bonds, general obligation bonds and insured bonds. The starting date for
      the Index in the Class A & Class C Shares' graph is from 10/31/94.

      Past performance is not predictive of future performance.

Average Annual Total Return

                                                % Return Without  % Return With
                                                  Sales Charge    Sales Charge**
================================================================================
Class A Shares*
================================================================================
One Year Ended 7/31/03                                +3.69%          -0.45%
- --------------------------------------------------------------------------------
Five Years Ended 7/31/03                              +4.61           +3.76
- --------------------------------------------------------------------------------
Inception (10/21/94)
through 7/31/03                                       +6.08           +5.59
- --------------------------------------------------------------------------------

*     Maximum sales charge is 4%.

**    Assuming maximum sales charge.

                                                    % Return         % Return
                                                  Without CDSC      With CDSC**
================================================================================
Class C Shares*
================================================================================
One Year Ended 7/31/03                                +3.07%          +2.08%
- --------------------------------------------------------------------------------
Five Years Ended 7/31/03                              +4.06           +4.06
- --------------------------------------------------------------------------------
Inception (10/21/94)
through 7/31/03                                       +5.52           +5.52
- --------------------------------------------------------------------------------

*     Maximum contingent deferred sales charge is 1% and is reduced to 0% after
      one year.

**    Assuming payment of applicable contingent deferred sales charge.


       MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003       7


[LOGO] Merrill Lynch Investment Managers

ML Pennsylvania Municipal Bond Fund's Class B and Class I Shares--Total Return
Based on a $10,000 Investment

A line graph depicting the growth of an investment in the Portfolio's Class B
Shares and Class I Shares compared to growth of an investment in the Lehman
Brothers Municipal Bond Index. Values are from July 1993 to July 2003:



                                    7/93             7/94              7/95             7/96              7/97
                                                                                           
ML Pennsylvania
Municipal Bond Fund+--
Class B Shares*                     $10,000          $10,186           $10,798          $11,444           $12,493

ML Pennsylvania
Municipal Bond Fund+--
Class I Shares*                     $ 9,600          $9,828            $10,473          $11,155           $12,240


                                    7/98             7/99              7/00             7/01              7/02             7/03
                                                                                                         
ML Pennsylvania
Municipal Bond Fund+--
Class B Shares*                     $13,186          $13,292           $13,549          $14,778           $15,675          $16,173

ML Pennsylvania
Municipal Bond Fund+--
Class I Shares*                     $12,973          $13,155           $13,478          $14,775           $15,752          $16,332


                                    7/93             7/94              7/95             7/96              7/97
                                                                                           
Lehman Brothers Municipal
Bond Index++                        $10,000          $10,187           $10,989          $11,714           $12,916


                                    7/98             7/99              7/00             7/01              7/02             7/03
                                                                                                         
Lehman Brothers Municipal
Bond Index++                        $13,690          $14,083           $14,691          $16,171           $17,256          $17,878


*     Assuming maximum sales charge, transaction costs and other operating
      expenses, including advisory fees.

+     ML Pennsylvania Municipal Bond Fund invests primarily in long-term
      investment-grade obligations issued by or on behalf of the Commonwealth of
      Pennsylvania, its political subdivisions, agencies and instrumentalities
      and obligations of other qualifying issuers.

++    This unmanaged Index consists of long-term revenue bonds, prerefunded
      bonds, general obligation bonds and insured bonds.

      Past performance is not predictive of future performance.

Average Annual Total Return

                                                      % Return        % Return
                                                    Without CDSC     With CDSC**
================================================================================
Class B Shares*
================================================================================
One Year Ended 7/31/03                                  +3.18%         -0.78%
- --------------------------------------------------------------------------------
Five Years Ended 7/31/03                                +4.16          +3.84
- --------------------------------------------------------------------------------
Ten Years Ended 7/31/03                                 +4.92          +4.92
- --------------------------------------------------------------------------------

*     Maximum contingent deferred sales charge is 4% and is reduced to 0% after
      six years.

**    Assuming payment of applicable contingent deferred sales charge.

                                               % Return Without   % Return With
                                                  Sales Charge    Sales Charge**
================================================================================
Class I Shares*
================================================================================
One Year Ended 7/31/03                                +3.69%         -0.46%
- --------------------------------------------------------------------------------
Five Years Ended 7/31/03                              +4.71          +3.86
- --------------------------------------------------------------------------------
Ten Years Ended 7/31/03                               +5.46          +5.03
- --------------------------------------------------------------------------------

*     Maximum sales charge is 4%.

**    Assuming maximum sales charge.


8      MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003


Schedule of Investments                                           (in Thousands)



                     S&P       Moody's  Face
State                Ratings+  Ratings+ Amount   Municipal Bonds                                                             Value
===================================================================================================================================
                                                                                                             
Pennsylvania--75.9%  A         NR*     $ 1,500   Allegheny County, Pennsylvania, Hospital Development Authority Revenue
                                                 Bonds (University of Pittsburgh Medical Center), Series B, 5.25%
                                                 due 6/15/2015                                                              $ 1,518
                     --------------------------------------------------------------------------------------------------------------
                     AAA       Aaa       4,785   Allegheny County, Pennsylvania, IDA, Commercial Development Revenue
                                                 Refunding Bonds (MPB Associates Project), 7.70% due 12/01/2013 (d)           5,883
                     --------------------------------------------------------------------------------------------------------------
                     BBB+      Baa1      1,500   Allegheny County, Pennsylvania, IDA, Environmental Improvement Revenue
                                                 Refunding Bonds (USX Corporation), 6.10% due 7/15/2020                       1,526
                     --------------------------------------------------------------------------------------------------------------
                     NR*       NR*       1,000   Allegheny County, Pennsylvania, Redevelopment Authority, Tax Increment
                                                 Revenue Bonds (Waterfront Project), Series A, 6.30% due 12/15/2018           1,084
                     --------------------------------------------------------------------------------------------------------------
                     BBB+      NR*       1,000   Bucks County, Pennsylvania, IDA, Revenue Refunding Bonds (Pennswood
                                                 Village Project), Series A, 6% due 10/01/2027                                1,004
                     --------------------------------------------------------------------------------------------------------------
                     BBB       Baa2      1,000   Delaware County, Pennsylvania, Hospital Authority Revenue Bonds, GO
                                                 (Crozer-Chester Medical Center), 6.25% due 12/15/2022                        1,004
                     --------------------------------------------------------------------------------------------------------------
                     NR*       Aaa       2,200   Downingtown, Pennsylvania, Area School District, GO, Refunding, 5.70%
                                                 due 3/01/2021 (a)                                                            2,319
                     --------------------------------------------------------------------------------------------------------------
                     NR*       NR*         920   Erie, Western Pennsylvania Port Authority Revenue Bonds, 6.875%
                                                 due 6/15/2016                                                                  957
                     --------------------------------------------------------------------------------------------------------------
                     A         A2        1,500   Lehigh County, Pennsylvania, General Purpose Authority, Hospital
                                                 Revenue Bonds (Lehigh Valley Health Network), Series A, 5.25%
                                                 due 7/01/2032                                                                1,395
                     --------------------------------------------------------------------------------------------------------------
                     AAA       Aaa       2,000   Luzerne County, Pennsylvania, IDA, Exempt Facilities Revenue Refunding
                                                 Bonds (Pennsylvania Gas and Water Company Project), AMT, Series A, 7%
                                                 due 12/01/2017 (a)                                                           2,166
                     --------------------------------------------------------------------------------------------------------------
                                                 Mifflin County, Pennsylvania, Hospital Authority, Revenue Refunding
                                                 Bonds (Lewiston Hospital):
                     AA        NR*       2,550       6.40% due 7/01/2020                                                      2,772
                     AA        NR*       1,000       6.20% due 7/01/2030                                                      1,069
                     --------------------------------------------------------------------------------------------------------------
                                                 Pennsylvania Convention Center Revenue Refunding Bonds, Series A (e):
                     AAA       Aaa       1,555       6.70% due 9/01/2014                                                      1,667
                     AAA       Aaa       2,500       6.75% due 9/01/2019                                                      2,680
                     --------------------------------------------------------------------------------------------------------------
                     NR*       NR*       1,000   Pennsylvania Economic Development Financing Authority, Exempt
                                                 Facilities Revenue Bonds (National Gypsum Company), AMT, Series B,
                                                 6.125% due 11/01/2027                                                          900
                     --------------------------------------------------------------------------------------------------------------
                     A         Baa3      2,000   Pennsylvania Economic Development Financing Authority Revenue Bonds
                                                 (30th Station Garage Project), AMT, 5.875% due 6/01/2033                     2,025
                     --------------------------------------------------------------------------------------------------------------
                     BBB       Baa2      4,000   Pennsylvania Economic Development Financing Authority, Wastewater
                                                 Treatment Revenue Bonds (Sun Company Inc.--R & M Project), AMT,
                                                 Series A, 7.60% due 12/01/2024                                               4,220
                     --------------------------------------------------------------------------------------------------------------
                     AA+       Aa2       1,950   Pennsylvania HFA, Revenue Bonds, RIB, AMT, 10.98% due 4/01/2025 (f)          1,982
                     --------------------------------------------------------------------------------------------------------------
                     AA+       Aa2       1,160   Pennsylvania HFA, S/F Mortgage Revenue Bonds, AMT, Series 40, 6.90%
                                                 due 4/01/2025                                                                1,185


Portfolio Abbreviations

To simplify the listings of Merrill Lynch Pennsylvania Municipal Bond Fund's
portfolio holdings in the Schedule of Investments, we have abbreviated the names
of many of the securities according to the list at right.

AMT     Alternative Minimum Tax (subject to)
GO      General Obligation Bonds
HFA     Housing Finance Agency
IDA     Industrial Development Authority
RIB     Residual Interest Bonds
RITR    Residual Interest Trust Receipts
S/F     Single-Family


       MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003       9


[LOGO] Merrill Lynch Investment Managers

Schedule of Investments (continued)                               (in Thousands)



                     S&P       Moody's  Face
State                Ratings+  Ratings+ Amount   Municipal Bonds                                                             Value
===================================================================================================================================
                                                                                                             
Pennsylvania                                     Pennsylvania HFA, S/F Mortgage Revenue Refunding Bonds, AMT:
(concluded)          AA+       Aa2      $  790       Series 41B, 6.65% due 4/01/2025                                        $   810
                     AA+       Aa2       1,250       Series 59A, 5.80% due 10/01/2029                                         1,271
                     --------------------------------------------------------------------------------------------------------------
                     AA+       Aa2       2,000   Pennsylvania HFA, S/F Revenue Refunding Bonds, AMT, Series 73A, 5.45%
                                                 due 10/01/2032                                                               2,003
                     --------------------------------------------------------------------------------------------------------------
                                                 Pennsylvania State, GO (e):
                     NR*       Aaa       1,500       RIB, Series 465X, 10.36% due 10/01/2019 (f)                              1,726
                     AAA       Aaa       4,000       Refunding, First Series, 6% due 1/15/2017                                4,442
                     --------------------------------------------------------------------------------------------------------------
                                                 Pennsylvania State Higher Educational Facilities Authority, College
                                                 and University Revenue Refunding Bonds:
                     AA        NR*       1,440       (University of the Arts), 5.75% due 3/15/2030 (h)                        1,478
                     A-        NR*       2,000       (Ursinus College), 5.90% due 1/01/2027                                   2,041
                     --------------------------------------------------------------------------------------------------------------
                                                 Philadelphia, Pennsylvania, Authority for Industrial Development,
                                                 Senior Living Revenue Bonds:
                     NR*       Baa2        500       (Rieder House Project), Series A, 6.10% due 7/01/2033                      480
                     NR*       Baa2        500       (Saligman House Project), Series C, 6.10% due 7/01/2033                    480
                     --------------------------------------------------------------------------------------------------------------
                     AAA       Aaa       2,000   Philadelphia, Pennsylvania, Gas Works Revenue Bonds, 12th Series B,
                                                 7% due 5/15/2020 (b)(e)                                                      2,429
                     --------------------------------------------------------------------------------------------------------------
                     AAA       NR*       3,000   Philadelphia, Pennsylvania, Hospitals and Higher Education Facilities
                                                 Authority, Hospital Revenue Refunding Bonds (Presbyterian Medical
                                                 Center), 6.65% due 12/01/2019 (b)                                            3,626
                     --------------------------------------------------------------------------------------------------------------
                     AAA       Aaa       4,400   Philadelphia, Pennsylvania, School District, GO, Series A, 5.75% due
                                                 2/01/2030 (d)                                                                4,628
                     --------------------------------------------------------------------------------------------------------------
                     A-        NR*       2,000   Sayre, Pennsylvania, Health Care Facilities Authority Revenue Bonds
                                                 (Guthrie Health), Series A, 5.875% due 12/01/2031                            1,997
                     --------------------------------------------------------------------------------------------------------------
                     NR*       Aa3       2,745   South Central Pennsylvania, General Authority, Revenue Refunding Bonds
                                                 (Wellspan Health Obligated), 5.625% due 5/15/2026                            2,772
                     --------------------------------------------------------------------------------------------------------------
                     AAA       Aaa       1,500   Washington County, Pennsylvania, Capital Funding Authority Revenue
                                                 Bonds (Capital Projects and Equipment Program), 6.15% due 12/01/2029 (a)     1,679
===================================================================================================================================
Puerto Rico--13.4%   A-        Baa2      1,280   Children's Trust Fund, Puerto Rico, Tobacco Settlement Revenue Bonds,
                                                 5.625% due 5/15/2043                                                         1,105
                     --------------------------------------------------------------------------------------------------------------
                     A-        Baa2      1,350   Children's Trust Fund, Puerto Rico, Tobacco Settlement Revenue
                                                 Refunding Bonds, 5.375% due 5/15/2033                                        1,168
                     --------------------------------------------------------------------------------------------------------------
                                                 Puerto Rico Commonwealth, GO (f):
                     A-        Aaa       2,370       RIB, Series 703X, 9.923% due 7/01/2021 (c)                               2,789
                     AAAr      Aaa       2,000       Refunding, RITR, Class R, Series 3, 10.299% due 7/01/2016 (e)            2,521
                     --------------------------------------------------------------------------------------------------------------
                     A-        Baa2      4,800   Puerto Rico Commonwealth, Highway and Transportation Authority,
                                                 Transportation Revenue Bonds, 5% due 7/01/2028                               4,584
===================================================================================================================================
Virgin Islands--     BBB-      Baa3      1,000   Virgin Islands Government Refinery Facilities Revenue Bonds (Hovensa
1.1%                                             Coker Project), AMT, 6.50% due 7/01/2021                                     1,000
                     --------------------------------------------------------------------------------------------------------------
                                                 Total Municipal Bonds (Cost--$78,914)--90.4%                                82,385
                     ==============================================================================================================



10     MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003


Schedule of Investments (concluded)                               (in Thousands)



                                        Shares
                                        Held     Short-Term Securities                                                       Value
===================================================================================================================================
                                                                                                                  
                                         4,503   CMA Pennsylvania Municipal Money Fund (g)                                 $  4,503
                     --------------------------------------------------------------------------------------------------------------
                                                 Total Short-Term Securities (Cost--$4,503)--4.9%                             4,503
===================================================================================================================================
                      Total Investments (Cost--$83,417)--95.3%                                                               86,888

                      Unrealized Appreciation on Forward Interest Rate Swaps**--1.5%                                          1,382

                      Other Assets Less Liabilities--3.2%                                                                     2,894
                                                                                                                           --------
                      Net Assets--100.0%                                                                                   $ 91,164
                                                                                                                           ========


(a)   AMBAC Insured.
(b)   Escrowed to maturity.
(c)   FGIC Insured.
(d)   FSA Insured.
(e)   MBIA Insured.
(f)   The interest rate is subject to change periodically and inversely based
      upon prevailing market rates. The interest rate shown is the rate in
      effect at July 31, 2003.
(g)   Investments in companies considered to be an affiliate of the Fund (such
      companies are defined as "Affiliated Companies" in Section 2(a)(3) of the
      Investment Company Act of 1940) are as follows:

                                                                  (in Thousands)
      --------------------------------------------------------------------------
                                                           Net          Dividend
      Affiliate                                         Activity         Income
      --------------------------------------------------------------------------
      CMA Pennsylvania Municipal Money Fund               4,503            $8
      --------------------------------------------------------------------------

(h)   Radian Insured.
+     Ratings of issues shown are unaudited.
*     Not Rated.
**    Forward interest rate swaps entered into as of July 31, 2003 were as
      follows:

                                                                  (in Thousands)
      --------------------------------------------------------------------------
                                                        Notional     Unrealized
                                                         Amount     Appreciation
      --------------------------------------------------------------------------
      Receive a variable rate equal to
        7-Day Bond Market Association
        Municipal Swap Index rate and pay a
        fixed rate of 3.756%

      Broker, Morgan Stanley Capital
        Services Inc. Expires, September 2023            14,300        $1,382
      --------------------------------------------------------------------------

      See Notes to Financial Statements.


       MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003      11


[LOGO] Merrill Lynch Investment Managers

Statement of Assets and Liabilities

As of July 31, 2003


                                                                                                           
============================================================================================================================
Assets
- ----------------------------------------------------------------------------------------------------------------------------
                   Investments, at value (identified cost--$83,417,169) ..................                       $86,887,610
                   Cash ..................................................................                            13,914
                   Unrealized appreciation on forward interest rate swaps ................                         1,382,495
                   Receivables:
                      Securities sold ....................................................      $ 2,046,923
                      Interest ...........................................................        1,060,559
                      Beneficial interest sold ...........................................           57,904
                      Dividends from affiliates ..........................................               36        3,165,422
                                                                                                -----------
                   Prepaid registration fees and other assets ............................                             8,406
                                                                                                                 -----------
                   Total assets ..........................................................                        91,457,847
                                                                                                                 -----------
============================================================================================================================
Liabilities
- ----------------------------------------------------------------------------------------------------------------------------
                   Payables:
                      Beneficial interest redeemed .......................................           98,962
                      Dividends to shareholders ..........................................           92,100
                      Investment adviser .................................................           43,112
                      Distributor ........................................................           27,743
                      Other affiliates ...................................................           10,545          272,462
                                                                                                -----------
                   Accrued expenses ......................................................                            21,538
                                                                                                                 -----------
                   Total liabilities .....................................................                           294,000
                                                                                                                 -----------
============================================================================================================================
Net Assets
- ----------------------------------------------------------------------------------------------------------------------------
                   Net assets ............................................................                       $91,163,847
                                                                                                                 ===========
============================================================================================================================
Net Assets Consist of
- ----------------------------------------------------------------------------------------------------------------------------
                   Class A Shares of beneficial interest, $.10 par value, unlimited number
                   of shares authorized ..................................................                       $   212,368
                   Class B Shares of beneficial interest, $.10 par value, unlimited number
                   of shares authorized ..................................................                           390,600
                   Class C Shares of beneficial interest, $.10 par value, unlimited number
                   of shares authorized ..................................................                           120,617
                   Class I Shares of beneficial interest, $.10 par value, unlimited number
                   of shares authorized ..................................................                           102,370
                   Paid-in capital in excess of par ......................................                        88,600,002
                   Undistributed investment income--net ..................................      $    57,895
                   Accumulated realized capital losses on investments--net ...............       (3,172,941)
                   Unrealized appreciation on investments--net ...........................        4,852,936
                                                                                                -----------
                   Total accumulated earnings--net .......................................                         1,737,890
                                                                                                                 -----------
                   Net assets ............................................................                       $91,163,847
                                                                                                                 ===========
============================================================================================================================
Net Asset Value
- ----------------------------------------------------------------------------------------------------------------------------
                   Class A--Based on net assets of $23,460,083 and 2,123,681 shares of
                   beneficial interest outstanding .......................................                       $     11.05
                                                                                                                 ===========
                   Class B--Based on net assets of $43,098,561 and 3,906,003 shares of
                   beneficial interest outstanding .......................................                       $     11.03
                                                                                                                 ===========
                   Class C--Based on net assets of $13,309,461 and 1,206,165 shares of
                   beneficial interest outstanding .......................................                       $     11.03
                                                                                                                 ===========
                   Class I--Based on net assets of $11,295,742 and 1,023,700 shares of
                   beneficial interest outstanding .......................................                       $     11.03
                                                                                                                 ===========


      See Notes to Financial Statements.


12     MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003


Statement of Operations

For the Year Ended July 31, 2003


                                                                                           
============================================================================================================
Investment Income
- ------------------------------------------------------------------------------------------------------------
                   Interest .............................................                        $ 5,300,250
                   Dividends from affiliates ............................                              7,809
                                                                                                 -----------
                   Total income .........................................                          5,308,059
                                                                                                 -----------
============================================================================================================
Expenses
- ------------------------------------------------------------------------------------------------------------
                   Investment advisory fees .............................      $   513,528
                   Account maintenance and distribution fees--Class B ...          248,657
                   Accounting services ..................................           81,891
                   Professional fees ....................................           77,587
                   Account maintenance and distribution fees--Class C ...           68,489
                   Printing and shareholder reports .....................           41,809
                   Transfer agent fees--Class B .........................           29,861
                   Account maintenance fees--Class A ....................           20,566
                   Registration fees ....................................           20,048
                   Trustees' fees and expenses ..........................           16,860
                   Transfer agent fees--Class A .........................           10,571
                   Custodian fees .......................................            7,686
                   Transfer agent fees--Class C .........................            6,900
                   Pricing fees .........................................            6,400
                   Transfer agent fees--Class I .........................            6,008
                   Other ................................................           13,913
                                                                               -----------
                   Total expenses before reimbursement ..................        1,170,774
                   Reimbursement of expenses ............................           (7,411)
                                                                               -----------
                   Total expenses after reimbursement ...................                          1,163,363
                                                                                                 -----------
                   Investment income--net ...............................                          4,144,696
                                                                                                 -----------
============================================================================================================
Realized & Unrealized Gain (Loss) on Investments -- Net
- ------------------------------------------------------------------------------------------------------------
                   Realized gain on investments--net ....................                            356,164
                   Change in unrealized appreciation on investments--net                          (1,374,424)
                                                                                                 -----------
                   Total realized and unrealized loss on investments--net                         (1,018,260)
                                                                                                 -----------
                   Net Increase in Net Assets Resulting from Operations .                        $ 3,126,436
                                                                                                 ===========


      See Notes to Financial Statements.


       MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003      13


[LOGO] Merrill Lynch Investment Managers

Statements of Changes in Net Assets



                                                                                                   For the Year Ended
                                                                                                        July 31,
                                                                                             -----------------------------
Increase (Decrease) in Net Assets:                                                                2003             2002
==========================================================================================================================
                                                                                                        
Operations
- --------------------------------------------------------------------------------------------------------------------------
                   Investment income--net ...............................................    $  4,144,696     $  4,121,694
                   Realized gain on investments--net ....................................         356,164          903,353
                   Change in unrealized appreciation on investments--net ................      (1,374,424)         455,837
                                                                                             -----------------------------
                   Net increase in net assets resulting from operations .................       3,126,436        5,480,884
                                                                                             -----------------------------
==========================================================================================================================
Dividends to Shareholders
- --------------------------------------------------------------------------------------------------------------------------
                   Investment income--net:
                      Class A ...........................................................        (964,384)        (669,652)
                      Class B ...........................................................      (2,139,645)      (2,484,553)
                      Class C ...........................................................        (477,116)        (325,975)
                      Class I ...........................................................        (560,042)        (635,828)
                                                                                             -----------------------------
                   Net decrease in net assets resulting from dividends to shareholders ..      (4,141,187)      (4,116,008)
                                                                                             -----------------------------
==========================================================================================================================
Beneficial Interest Transactions
- --------------------------------------------------------------------------------------------------------------------------
                   Net increase (decrease) in net assets derived from beneficial interest
                   transactions .........................................................          49,289       (2,193,671)
                                                                                             -----------------------------
==========================================================================================================================
Net Assets
- --------------------------------------------------------------------------------------------------------------------------
                   Total decrease in net assets .........................................        (965,462)        (828,795)
                   Beginning of year ....................................................      92,129,309       92,958,104
                                                                                             -----------------------------
                   End of year* .........................................................    $ 91,163,847     $ 92,129,309
                                                                                             =============================
                      * Undistributed investment income--net ............................    $     57,895     $     54,386
                                                                                             =============================


      See Notes to Financial Statements.


14     MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003


Financial Highlights



                                                                                                  Class A++
The following per share data and ratios have been derived                   -------------------------------------------------------
from information provided in the financial statements.                                   For the Year Ended July 31,
                                                                            -------------------------------------------------------
Increase (Decrease) in Net Asset Value:                                       2003        2002        2001        2000        1999
===================================================================================================================================
                                                                                                             
Per Share Operating Performance
- -----------------------------------------------------------------------------------------------------------------------------------
                   Net asset value, beginning of year ....................  $ 11.17     $ 11.00     $ 10.55     $ 10.92     $ 11.54
                                                                            -------------------------------------------------------
                   Investment income--net ................................      .53+        .53         .53         .53         .53
                   Realized and unrealized gain (loss) on investments--net     (.12)        .17         .45        (.31)       (.38)
                                                                            -------------------------------------------------------
                   Total from investment operations ......................      .41         .70         .98         .22         .15
                                                                            -------------------------------------------------------
                   Less dividends and distributions:
                      Investment income--net .............................     (.53)       (.53)       (.53)       (.53)       (.53)
                      Realized gain on investments--net ..................       --          --          --          --        (.16)
                      In excess of realized gain on investments--net .....       --          --          --        (.06)       (.08)
                                                                            -------------------------------------------------------
                   Total dividends and distributions .....................     (.53)       (.53)       (.53)       (.59)       (.77)
                                                                            -------------------------------------------------------
                   Net asset value, end of year ..........................  $ 11.05     $ 11.17     $ 11.00     $ 10.55     $ 10.92
                                                                            =======================================================
===================================================================================================================================
Total Investment Return*
- -----------------------------------------------------------------------------------------------------------------------------------
                   Based on net asset value per share ....................     3.69%       6.50%       9.51%       2.25%       1.29%
                                                                            =======================================================
===================================================================================================================================
Ratios to Average Net Assets
- -----------------------------------------------------------------------------------------------------------------------------------
                   Expenses, net of reimbursement ........................      .98%       1.00%        .95%        .91%        .90%
                                                                            =======================================================
                   Expenses ..............................................      .99%       1.00%        .95%        .91%        .90%
                                                                            =======================================================
                   Investment income--net ................................     4.69%       4.78%       4.91%       5.09%       4.69%
                                                                            =======================================================
===================================================================================================================================
Supplemental Data
- -----------------------------------------------------------------------------------------------------------------------------------
                   Net assets, end of year (in thousands) ................  $23,460     $16,295     $12,121     $ 6,673     $ 9,900
                                                                            =======================================================
                   Portfolio turnover ....................................    34.92%      30.23%      73.23%      51.32%      43.18%
                                                                            =======================================================


*     Total investment returns exclude the effects of sales charges.

+     Based on average shares outstanding.

++    Effective April 14, 2003, Class D Shares were redesignated Class A Shares.

      See Notes to Financial Statements.


       MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003      15


[LOGO] Merrill Lynch Investment Managers

Financial Highlights (continued)



                                                                                                    Class B
The following per share data and ratios have been derived                   -------------------------------------------------------
from information provided in the financial statements.                                    For the Year Ended July 31,
                                                                            -------------------------------------------------------
Increase (Decrease) in Net Asset Value:                                       2003        2002        2001        2000        1999
===================================================================================================================================
                                                                                                             
Per Share Operating Performance
- -----------------------------------------------------------------------------------------------------------------------------------
                   Net asset value, beginning of year ....................  $ 11.16     $ 10.99     $ 10.54     $ 10.90     $ 11.53
                                                                            -------------------------------------------------------
                   Investment income--net ................................      .49+        .48         .49         .48         .49
                   Realized and unrealized gain (loss) on investments--net     (.14)        .17         .45        (.30)       (.39)
                                                                            -------------------------------------------------------
                   Total from investment operations ......................      .35         .65         .94         .18         .10
                                                                            -------------------------------------------------------
                   Less dividends and distributions:
                      Investment income--net .............................     (.48)       (.48)       (.49)       (.48)       (.49)
                      Realized gain on investments--net ..................       --          --          --          --        (.16)
                      In excess of realized gain on investments--net .....       --          --          --        (.06)       (.08)
                                                                            -------------------------------------------------------
                   Total dividends and distributions .....................     (.48)       (.48)       (.49)       (.54)       (.73)
                                                                            -------------------------------------------------------
                   Net asset value, end of year ..........................  $ 11.03     $ 11.16     $ 10.99     $ 10.54     $ 10.90
                                                                            =======================================================
===================================================================================================================================
Total Investment Return*
- -----------------------------------------------------------------------------------------------------------------------------------
                   Based on net asset value per share ....................     3.18%       6.07%       9.07%       1.92%        .78%
                                                                            =======================================================
===================================================================================================================================
Ratios to Average Net Assets
- -----------------------------------------------------------------------------------------------------------------------------------
                   Expenses, net of reimbursement ........................     1.39%       1.40%       1.35%       1.32%       1.31%
                                                                            =======================================================
                   Expenses ..............................................     1.40%       1.40%       1.35%       1.32%       1.31%
                                                                            =======================================================
                   Investment income--net ................................     4.31%       4.36%       4.52%       4.69%       4.29%
                                                                            =======================================================
===================================================================================================================================
Supplemental Data
- -----------------------------------------------------------------------------------------------------------------------------------
                   Net assets, end of year (in thousands) ................  $43,099     $54,421     $60,252     $68,723     $93,164
                                                                            =======================================================
                   Portfolio turnover ....................................    34.92%      30.23%      73.23%      51.32%      43.18%
                                                                            =======================================================


*     Total investment returns exclude the effects of sales charges.

+     Based on average shares outstanding.

      See Notes to Financial Statements.


16     MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003


Financial Highlights (continued)



                                                                                                    Class C
The following per share data and ratios have been derived                   -------------------------------------------------------
from information provided in the financial statements.                                    For the Year Ended July 31,
                                                                            -------------------------------------------------------
Increase (Decrease) in Net Asset Value:                                       2003        2002        2001        2000        1999
===================================================================================================================================
                                                                                                             
Per Share Operating Performance
- -----------------------------------------------------------------------------------------------------------------------------------
                   Net asset value, beginning of year ....................  $ 11.16     $ 10.99     $ 10.54     $ 10.90     $ 11.53
                                                                            -------------------------------------------------------
                   Investment income--net ................................      .47+        .47         .48         .47         .48
                   Realized and unrealized gain (loss) on investments--net     (.13)        .17         .45        (.30)       (.39)
                                                                            -------------------------------------------------------
                   Total from investment operations ......................      .34         .64         .93         .17         .09
                                                                            -------------------------------------------------------
                   Less dividends and distributions:
                      Investment income--net .............................     (.47)       (.47)       (.48)       (.47)       (.48)
                      Realized gain on investments--net ..................       --          --          --          --        (.16)
                      In excess of realized gain on investments--net .....       --          --          --        (.06)       (.08)
                                                                            -------------------------------------------------------
                   Total dividends and distributions .....................     (.47)       (.47)       (.48)       (.53)       (.72)
                                                                            -------------------------------------------------------
                   Net asset value, end of year ..........................  $ 11.03     $ 11.16     $ 10.99     $ 10.54     $ 10.90
                                                                            =======================================================
===================================================================================================================================
Total Investment Return*
- -----------------------------------------------------------------------------------------------------------------------------------
                   Based on net asset value per share ....................     3.07%       5.96%       8.97%       1.82%        .68%
                                                                            =======================================================
===================================================================================================================================
Ratios to Average Net Assets
- -----------------------------------------------------------------------------------------------------------------------------------
                   Expenses, net of reimbursement ........................     1.49%       1.51%       1.45%       1.42%       1.41%
                                                                            =======================================================
                   Expenses ..............................................     1.49%       1.51%       1.45%       1.42%       1.41%
                                                                            =======================================================
                   Investment income--net ................................     4.18%       4.27%       4.42%       4.60%       4.19%
                                                                            =======================================================
===================================================================================================================================
Supplemental Data
- -----------------------------------------------------------------------------------------------------------------------------------
                   Net assets, end of year (in thousands) ................  $13,309     $ 9,309     $ 7,007     $ 5,874     $ 7,088
                                                                            =======================================================
                   Portfolio turnover ....................................    34.92%      30.23%      73.23%      51.32%      43.18%
                                                                            =======================================================


*     Total investment returns exclude the effects of sales charges.

+     Based on average shares outstanding.

      See Notes to Financial Statements.


       MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003      17


[LOGO] Merrill Lynch Investment Managers

Financial Highlights (concluded)



                                                                                                   Class I++
The following per share data and ratios have been derived                   -------------------------------------------------------
from information provided in the financial statements.                                    For the Year Ended July 31,
                                                                            -------------------------------------------------------
Increase (Decrease) in Net Asset Value:                                       2003        2002        2001        2000        1999
===================================================================================================================================
                                                                                                             
Per Share Operating Performance
- -----------------------------------------------------------------------------------------------------------------------------------
                   Net asset value, beginning of year ....................  $ 11.16     $ 10.99     $ 10.54     $ 10.90     $ 11.52
                                                                            -------------------------------------------------------
                   Investment income--net ................................      .54+        .54         .54         .54         .54
                   Realized and unrealized gain (loss) on investments--net     (.13)        .17         .45        (.30)       (.38)
                                                                            -------------------------------------------------------
                   Total from investment operations ......................      .41         .71         .99         .24         .16
                                                                            -------------------------------------------------------
                   Less dividends and distributions:
                      Investment income--net .............................     (.54)       (.54)       (.54)       (.54)       (.54)
                      Realized gain on investments--net ..................       --          --          --          --        (.16)
                      In excess of realized gain on investments--net .....       --          --          --        (.06)       (.08)
                                                                            -------------------------------------------------------
                   Total dividends and distributions .....................     (.54)       (.54)       (.54)       (.60)       (.78)
                                                                            -------------------------------------------------------
                   Net asset value, end of year ..........................  $ 11.03     $ 11.16     $ 10.99     $ 10.54     $ 10.90
                                                                            =======================================================
===================================================================================================================================
Total Investment Return*
- -----------------------------------------------------------------------------------------------------------------------------------
                   Based on net asset value per share ....................     3.69%       6.61%       9.63%       2.44%       1.38%
                                                                            =======================================================
===================================================================================================================================
Ratios to Average Net Assets
- -----------------------------------------------------------------------------------------------------------------------------------
                   Expenses, net of reimbursement ........................      .88%        .90%        .84%        .81%        .80%
                                                                            =======================================================
                   Expenses ..............................................      .89%        .90%        .84%        .81%        .80%
                                                                            =======================================================
                   Investment income--net ................................     4.81%       4.88%       5.03%       5.20%       4.80%
                                                                            =======================================================
===================================================================================================================================
Supplemental Data
- -----------------------------------------------------------------------------------------------------------------------------------
                   Net assets, end of year (in thousands) ................  $11,296     $12,104     $13,578     $14,494     $19,536
                                                                            =======================================================
                   Portfolio turnover ....................................    34.92%      30.23%      73.23%      51.32%      43.18%
                                                                            =======================================================


*     Total investment returns exclude the effects of sales charges.

+     Based on average shares outstanding.

++    Effective April 14, 2003, Class A Shares were redesignated Class I Shares.

      See Notes to Financial Statements.


18     MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003


Notes to Financial Statements

1. Significant Accounting Policies:

Merrill Lynch Pennsylvania Municipal Bond Fund (the "Fund") is part of Merrill
Lynch Multi-State Municipal Series Trust (the "Trust"). The Fund is registered
under the Investment Company Act of 1940, as amended, as a non-diversified,
open-end management investment company. The Fund's financial statements are
prepared in conformity with accounting principles generally accepted in the
United States of America, which may require the use of management accruals and
estimates. The Fund offers multiple classes of shares. Effective April 14, 2003,
Class A Shares were redesignated Class I Shares and Class D Shares were
redesignated Class A Shares. The Fund's financial statements and financial
highlights contained within this report reflect the new share class
redesignation. Shares of Class A and Class I are sold with a front-end sales
charge. Shares of Class B and Class C 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 Class A, Class B
and Class C Shares bear certain expenses related to the account maintenance of
such shares, and Class B and Class C 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 account maintenance and distribution
expenditures. Income, expenses (other than expenses attributable to a specific
class) and realized and unrealized gains and losses on investments are allocated
daily to each class based on its relative net assets. The following is a summary
of significant accounting policies followed by the Fund.

(a) Valuation of investments -- Municipal bonds and other portfolio securities
in which the Fund invests are traded primarily in the over-the-counter municipal
bond and money markets and are valued at the last available bid price in the
over-the-counter market or on the basis of yield equivalents as obtained from
one or more dealers that make markets in the securities. Financial futures
contracts and options thereon, which are traded on exchanges, are valued at
their settlement prices as of the close of such exchanges. Forward interest rate
swaps are valued by quoted fair values received daily by the Fund from the
counterparty. Short-term investments with remaining maturities of sixty days or
less are valued at amortized cost, which approximates market value. Securities
and 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
Trustees of the Trust, including valuations furnished by a pricing service
retained by the Trust, which may utilize a matrix system for valuations. The
procedures of the pricing service and its valuations are reviewed by the
officers of the Trust under the general supervision of the Trustees.

(b) Derivative financial instruments -- The Fund may engage in various portfolio
investment strategies both to increase the return of the Fund and to hedge, or
protect, its exposure to interest rate movement and movements in the securities
markets. Losses may arise due to changes in the value of the contract or if the
counterparty does not perform under the contract.

o     Financial futures contracts -- The Fund may purchase or sell financial
      futures contracts and options on such futures contracts. Futures contracts
      are contracts for delayed delivery of securities at a specific future date
      and at a specific price or yield. Upon entering into a contract, the Fund
      deposits and maintains as collateral such initial margin as required by
      the exchange on which the transaction is effected. Pursuant to the
      contract, the Fund agrees 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
      Fund as unrealized gains or losses. When the contract is closed, the Fund
      records 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.


       MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003      19


[LOGO] Merrill Lynch Investment Managers

Notes to Financial Statements (continued)

o     Forward interest rate swaps -- The Fund may enter into forward interest
      rate swaps. In a forward interest rate swap, the Fund and the counterparty
      agree to make periodic net payments on a specified notional contract
      amount, commencing on a specified future effective date, unless terminated
      earlier. When the agreement is closed, the Fund records a realized gain or
      loss in an amount equal to the value of the agreement.

(c) Income taxes -- It is the 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.

(d) Security transactions and investment income -- Security transactions are
recorded on the dates the transactions 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 Fund amortizes all
premiums and discounts on debt securities.

(e) Prepaid registration fees -- Prepaid registration fees are charged to
expense as the related shares are issued.

(f) 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.

(g) Expenses -- Certain expenses have been allocated to the individual funds in
the Trust on a pro rata basis based upon the respective aggregate net asset
value of each fund included in the Trust.

2. Investment Advisory Agreement and Transactions with Affiliates:

The Fund has entered into an Investment Advisory Agreement with Fund Asset
Management, L.P. ("FAM"). The general partner of FAM is Princeton Services, Inc.
("PSI"), an indirect, wholly-owned subsidiary of Merrill Lynch & Co., Inc. ("ML
& Co."), which is the limited partner. The Fund has also entered into a
Distribution Agreement and Distribution Plans with FAM Distributors, Inc.
("FAMD" or the "Distributor"), which is a wholly-owned subsidiary of Merrill
Lynch Group, Inc.

FAM is responsible for the management of the Fund's portfolio and provides the
necessary personnel, facilities, equipment and certain other services necessary
to the operations of the Fund. For such services, the Fund pays a monthly fee
based upon the average daily value of the Fund's net assets at the following
annual rates: .55% of the Fund's average daily net assets not exceeding $500
million; .525% of average daily net assets in excess of $500 million but not
exceeding $1 billion; and .50% of average daily net assets in excess of $1
billion. For the year ended July 31, 2003, FAM reimbursed the Fund in the amount
of $7,411.


20     MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003


Notes to Financial Statements (continued)

Pursuant to the Distribution Plans adopted by the Fund in accordance with Rule
12b-1 under the Investment Company Act of 1940, the Fund pays the Distributor
ongoing account maintenance 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:

- --------------------------------------------------------------------------------
                                                  Account           Distribution
                                              Maintenance Fee           Fee
- --------------------------------------------------------------------------------
Class A ..............................             .10%                 --
Class B ..............................             .25%                .25%
Class C ..............................             .25%                .35%
- --------------------------------------------------------------------------------

Pursuant to a sub-agreement with the Distributor, Merrill Lynch, Pierce, Fenner
& Smith Incorporated ("MLPF&S"), a subsidiary of ML & Co., also provides account
maintenance and distribution services to the Fund. The ongoing account
maintenance fee compensates the Distributor and MLPF&S for providing account
maintenance services to Class A, Class B and Class C shareholders. The ongoing
distribution fee compensates the Distributor and MLPF&S for providing
shareholder and distribution-related services to Class B and Class C
shareholders.

For the year ended July 31, 2003, FAMD earned underwriting discounts and MLPF&S
earned dealer concessions on sales of the Fund's Class A and Class I Shares as
follows:

- --------------------------------------------------------------------------------
                                                     FAMD                MLPF&S
- --------------------------------------------------------------------------------
Class A ............................               $ 1,189               $13,522
Class I ............................               $   168               $ 1,707
- --------------------------------------------------------------------------------

For the year ended July 31, 2003, MLPF&S received contingent deferred sales
charges of $25,959 and $1,058 relating to transactions in Class B and Class C
Shares, respectively.

Financial Data Services, Inc. ("FDS"), a wholly-owned subsidiary of ML & Co., is
the Fund's transfer agent.

For the year ended July 31, 2003, the Fund reimbursed FAM $2,015 for certain
accounting services.

Certain officers and/or trustees of the Fund are officers and/or directors of
FAM, PSI, FDS, FAMD, and/or ML & Co.

3. Investments:

Purchases and sales of investments, excluding short-term securities, for the
year ended July 31, 2003 were $31,394,499 and $38,258,012, respectively.

Net realized gains (losses) for the year ended July 31, 2003 and net unrealized
gains as of July 31, 2003 were as follows:

- --------------------------------------------------------------------------------
                                                   Realized           Unrealized
                                                Gains (Losses)          Gains
- --------------------------------------------------------------------------------
Long-term investments ...................        $ 1,608,180         $ 3,470,441
Forward interest rate swaps .............                 --           1,382,495
Financial futures contracts .............         (1,252,016)                 --
                                                 -------------------------------
Total ...................................        $   356,164         $ 4,852,936
                                                 ===============================
- --------------------------------------------------------------------------------

As of July 31, 2003, net unrealized appreciation for Federal income tax purposes
aggregated $3,472,689, of which $4,164,272 related to appreciated securities and
$691,583 related to depreciated securities. The aggregate cost of investments at
July 31, 2003 for Federal income tax purposes was $83,414,921.


       MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003      21


[LOGO] Merrill Lynch Investment Managers

Notes to Financial Statements (continued)

4. Beneficial Interest Transactions:

Net increase (decrease) in net assets derived from beneficial interest
transactions was $49,289 and $(2,193,671) for the years ended July 31, 2003 and
July 31, 2002, respectively.

Transactions in shares of beneficial interest for each class were as follows:

- -------------------------------------------------------------------------------
Class A Shares for the Year                                            Dollar
Ended July 31, 2003+                                Shares             Amount
- -------------------------------------------------------------------------------
Shares sold ..............................           127,366       $  1,430,014
Automatic conversion of shares ...........           685,816          7,757,166
Shares issued to shareholders in
  reinvestment of dividends ..............            42,608            480,285
                                                -------------------------------
Total issued .............................           855,790          9,667,465
Shares redeemed ..........................          (190,556)        (2,147,504)
                                                -------------------------------
Net increase .............................           665,234       $  7,519,961
                                                ===============================

+     Effective April 14, 2003, Class D Shares were redesignated Class A Shares.

- -------------------------------------------------------------------------------
Class A Shares for the Year                                            Dollar
Ended July 31, 2002+                                Shares             Amount
- -------------------------------------------------------------------------------
Shares sold ..............................            57,816       $    634,872
Automatic conversion of shares ...........           547,991          6,045,097
Shares issued to shareholders in
  reinvestment of dividends ..............            29,116            320,670
                                                -------------------------------
Total issued .............................           634,923          7,000,639
Shares redeemed ..........................          (277,985)        (3,042,102)
                                                -------------------------------
Net increase .............................           356,938       $  3,958,537
                                                ===============================

+     Effective April 14, 2003, Class D Shares were redesignated Class A Shares.

- -------------------------------------------------------------------------------
Class B Shares for the Year                                            Dollar
Ended July 31, 2003                                 Shares             Amount
- -------------------------------------------------------------------------------
Shares sold ..............................           391,686       $  4,420,473
Shares issued to shareholders in
  reinvestment of dividends ..............            93,594          1,053,147
                                                -------------------------------
Total issued .............................           485,280          5,473,620
Automatic conversion of shares ...........          (686,486)        (7,757,166)
Shares redeemed ..........................          (769,446)        (8,688,344)
                                                -------------------------------
Net decrease .............................          (970,652)      $(10,971,890)
                                                ===============================

- -------------------------------------------------------------------------------
Class B Shares for the Year                                            Dollar
Ended July 31, 2002                                 Shares             Amount
- -------------------------------------------------------------------------------
Shares sold ..............................           546,035       $  6,010,548
Shares issued to shareholders in
  reinvestment of dividends ..............           110,155          1,211,642
                                                -------------------------------
Total issued .............................           656,190          7,222,190
Automatic conversion of shares ...........          (548,706)        (6,045,097)
Shares redeemed ..........................          (712,662)        (7,841,415)
                                                -------------------------------
Net decrease .............................          (605,178)      $ (6,664,322)
                                                ===============================

- -------------------------------------------------------------------------------
Class C Shares for the Year                                            Dollar
Ended July 31, 2003                                 Shares             Amount
- -------------------------------------------------------------------------------
Shares sold ..............................           491,888       $  5,547,248
Shares issued to shareholders in
  reinvestment of dividends ..............            23,499            264,648
                                                -------------------------------
Total issued .............................           515,387          5,811,896
Shares redeemed ..........................          (143,404)        (1,628,417)
                                                -------------------------------
Net increase .............................           371,983       $  4,183,479
                                                ===============================


22     MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003


Notes to Financial Statements (continued)

- -------------------------------------------------------------------------------
Class C Shares for the Year                                            Dollar
Ended July 31, 2002                                 Shares             Amount
- -------------------------------------------------------------------------------
Shares sold ..............................           338,313       $  3,725,702
Shares issued to shareholders in
  reinvestment of dividends ..............            16,075            176,815
                                                -------------------------------
Total issued .............................           354,388          3,902,517
Shares redeemed ..........................          (157,701)        (1,730,173)
                                                -------------------------------
Net increase .............................           196,687       $  2,172,344
                                                ===============================

- -------------------------------------------------------------------------------
Class I Shares for the Year                                            Dollar
Ended July 31, 2003+                                Shares             Amount
- -------------------------------------------------------------------------------
Shares sold ..............................            83,885       $    949,230
Shares issued to shareholders in
  reinvestment of dividends ..............            25,095            282,463
                                                -------------------------------
Total issued .............................           108,980          1,231,693
Shares redeemed ..........................          (169,901)        (1,913,954)
                                                -------------------------------
Net decrease .............................           (60,921)      $   (682,261)
                                                ===============================

+     Effective April 14, 2003, Class A Shares were redesignated Class I Shares.

- -------------------------------------------------------------------------------
Class I Shares for the Year                                            Dollar
Ended July 31, 2002+                                Shares             Amount
- -------------------------------------------------------------------------------
Shares sold ..............................           144,370       $  1,589,151
Shares issued to shareholders in
  reinvestment of dividends ..............            29,344            322,725
                                                -------------------------------
Total issued .............................           173,714          1,911,876
Shares redeemed ..........................          (324,412)        (3,572,106)
                                                -------------------------------
Net decrease .............................          (150,698)      $ (1,660,230)
                                                ===============================

+     Effective April 14, 2003, Class A Shares were redesignated Class I Shares.

5. Short-Term Borrowings:

The Fund, along with certain other funds managed by FAM and its affiliates, is a
party to a $500,000,000 credit agreement with Bank One, N.A. and certain other
lenders. The Fund may borrow under the credit agreement to fund shareholder
redemptions and for other lawful purposes other than for leverage. The Fund may
borrow up to the maximum amount allowable under the Fund's current prospectus
and statement of additional information, subject to various other legal,
regulatory or contractual limits. The Fund pays a commitment fee of .09% per
annum based on the 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 .50% or a base
rate as determined by Bank One, N.A. On November 29, 2002, the credit agreement
was renewed for one year under the same terms, except that the commitment was
reduced from $1,000,000,000 to $500,000,000. The Fund did not borrow under the
credit agreement during the year ended July 31, 2003.


       MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003      23


[LOGO] Merrill Lynch Investment Managers

Notes to Financial Statements (concluded)

6. Distributions to Shareholders:

The tax character of distributions paid during the fiscal years ended July 31,
2003 and July 31, 2002 was as follows:

- -------------------------------------------------------------------------------
                                                  7/31/2003          7/31/2002
- -------------------------------------------------------------------------------
Distributions paid from:
  Tax-exempt income ......................      $  4,141,187       $  4,116,008
                                                -------------------------------
Total distributions ......................      $  4,141,187       $  4,116,008
                                                ===============================

As of July 31, 2003, the components of accumulated earnings on a tax basis were
as follows:

- -----------------------------------------------------------------------------
Undistributed tax-exempt income--net ....................         $    55,646
Undistributed long-term capital gains--net ..............                  --
                                                                  -----------
Total undistributed earnings--net .......................              55,646
Capital loss carryforward ...............................          (2,422,327)*
Unrealized gains--net ...................................           4,104,571**
                                                                  -----------
Total accumulated earnings--net .........................         $ 1,737,890
                                                                  ===========

*     On July 31, 2003, the Fund had a net capital loss carryforward of
      $2,422,327, all of which expires in 2009. 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 tax deferral of losses on straddles and the
      difference between book and tax amortization methods for premiums and
      discounts on fixed income securities.


24     MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003


Independent Auditors' Report

To the Shareholders and Board of Trustees of
Merrill Lynch Pennsylvania Municipal Bond
Fund of Merrill Lynch Multi-State Municipal
Series Trust:

We have audited the accompanying statement of assets and liabilities, including
the schedule of investments, of Merrill Lynch Pennsylvania Municipal Bond Fund
of Merrill Lynch Multi-State Municipal Series Trust as of July 31, 2003, and the
related statement 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.
These financial statements and financial highlights are the responsibility of
the 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 auditing standards generally accepted
in the United States of America. 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. An audit
includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements. Our procedures included confirmation of
securities owned as of July 31, 2003 by correspondence with the custodian and
brokers; where replies were not received from brokers, we performed other
auditing procedures. An audit also includes assessing the accounting principles
used and significant estimates made by management, as well as evaluating the
overall financial statement presentation. 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 financial position of
Merrill Lynch Pennsylvania Municipal Bond Fund of Merrill Lynch Multi-State
Municipal Series Trust as of July 31, 2003, the results of its operations for
the year then ended, the changes in its net assets for each of the two years in
the period then ended, and its financial highlights for each of the five years
in the period then ended, in conformity with accounting principles generally
accepted in the United States of America.

Deloitte & Touche LLP
Princeton, New Jersey
September 19, 2003


       MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003      25


[LOGO] Merrill Lynch Investment Managers

Officers and Trustees (unaudited)



                                                                                                        Number of
                                                                                                        Portfolios in  Other Public
                              Position(s)  Length                                                       Fund Complex   Directorships
                              Held         of Time                                                      Overseen by    Held by
Name          Address & Age   with Fund    Served      Principal Occupation(s) During Past 5 Years      Trustee        Trustee
====================================================================================================================================
        Interested Trustee
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                     
Terry K.      P.O. Box 9011   President    1999 to     President and Chairman of Merrill Lynch Invest-  118 Funds      None
Glenn*        Princeton, NJ   and          present     ment Managers, L.P. ("MLIM")/Fund Asset          163 Portfolios
              08543-9011      Trustee      and         Management, L.P. ("FAM")--Advised Funds since
              Age: 62                      1992 to     1999; Chairman (Americas Region) of MLIM from
                                           present     2000 to 2002; Executive Vice President of FAM
                                                       and MLIM (which terms as used herein include
                                                       their corporate predecessors) from 1983 to 2002;
                                                       President of FAM Distributors, Inc. ("FAMD")
                                                       from 1986 to 2002 and Director thereof from 1991
                                                       to 2002; Executive Vice President and Director
                                                       of Princeton Services, Inc. ("Princeton
                                                       Services") from 1993 to 2002; President of
                                                       Princeton Administrators, L.P. from 1989 to
                                                       2002; Director  of Financial Data Services, Inc.
                                                       from 1985 to  2002.
              ----------------------------------------------------------------------------------------------------------------------
              *  Mr. Glenn is a director, trustee or member of an advisory board of certain other investment companies for which FAM
                 or MLIM acts as investment adviser. Mr. Glenn is an "interested person," as described in the Investment Company
                 Act, of the Trust based on his former positions with FAM, MLIM, FAMD, Princeton Services and Princeton
                 Administrators, L.P. The Trustee's term is unlimited. Trustees serve until their resignation, removal, or death, or
                 until December 31 of the year in which they turn 72. As Trust President, Mr. Glenn serves at the pleasure of the
                 Board of Trustees.

====================================================================================================================================
        Independent Trustees*
- ------------------------------------------------------------------------------------------------------------------------------------
James H.      P.O. Box 9095   Trustee      1995 to     Director, The China Business Group, Inc. since    40 Funds      None
Bodurtha      Princeton, NJ                present     1996 and Executive Vice President thereof from    59 Portfolios
              08543-9095                               1996 to 2003; Chairman, Berkshire Holding
              Age: 59                                  Corporation since 1982.
- ------------------------------------------------------------------------------------------------------------------------------------
Joe Grills    P.O. Box 9095   Trustee      2002 to     Member of the Committee of Investment of          40 Funds      Kimco Realty
              Princeton, NJ                present     Employee Benefit Assets of the Association of     59 Portfolios Corporation
              08543-9095                               Financial Professionals ("CIEBA") since 1986 and
              Age: 68                                  Chairman thereof from 1991 to 1992; Member of
                                                       the Investment Advisory Committees of the State
                                                       of New York Common Retirement Fund since 1989;
                                                       Member of the Investment Advisory Committee of
                                                       the Howard Hughes Medical Institute from 1997 to
                                                       2000; Director, Duke Management Company since
                                                       1992 and Vice Chairman thereof since 1998;
                                                       Director, LaSalle Street Fund from 1995 to 2001;
                                                       Director, Kimco Realty Corporation since 1997;
                                                       Member of the Investment Advisory Committee of
                                                       the Virginia Retirement System since 1998 and Vice
                                                       Chairman thereof since 2002; Director, Montpelier
                                                       Foundation since 1998 and Vice Chairman thereof
                                                       since 2000; Member of the Investment Committee
                                                       of the Woodberry Forest School since 2000; Member
                                                       of the Investment Committee of the National Trust
                                                       for Historic Preservation since 2000.
- ------------------------------------------------------------------------------------------------------------------------------------
Herbert I.    P.O. Box 9095   Trustee      1987 to     John M. Olin Professor of Humanities, New York    40 Funds      None
London        Princeton, NJ                present     University since 1993 and Professor thereof       59 Portfolios
              08543-9095                               since 1980; President of Hudson Institute since
              Age: 64                                  1997  and Trustee thereof since 1980.
- ------------------------------------------------------------------------------------------------------------------------------------



26     MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003


Officers and Trustees (unaudited) (concluded)



                                                                                                        Number of
                                                                                                        Portfolios in  Other Public
                              Position(s)  Length                                                       Fund Complex   Directorships
                              Held         of Time                                                      Overseen by    Held by
Name          Address & Age   with Fund    Served      Principal Occupation(s) During Past 5 Years      Trustee        Trustee
====================================================================================================================================
        Independent Trustees* (concluded)
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                     
Andre F.      P.O. Box 9095   Trustee      1985 to     George Gund Professor of Finance and Banking,     40 Funds      None
Perold        Princeton, NJ                present     Harvard Business School since 2000 and a member   59 Portfolios
              08543-9095                               of the faculty thereof since 1979; Director and
              Age: 51                                  Chairman of the Board, UNX, Inc. since 2003;
                                                       Director, Stockback.com from 2002 to 2002;
                                                       Director, Sanlam Limited and Sanlam Life since
                                                       2001; Director, Genbel Securities and Gensec
                                                       Bank since 1999; Director, Bulldogresearch.com
                                                       from 2000 to 2001; Director, Sanlam Investment
                                                       Management from 1999 to 2001; Director, Quantec
                                                       Limited from 1991 to 1999.
- ------------------------------------------------------------------------------------------------------------------------------------
Roberta       P.O. Box 9095   Trustee      2000 to     Shareholder, Modrall, Sperling, Roehl, Harris &   40 Funds      None
Cooper Ramo   Princeton, NJ                present     Sisk, P.A. since 1993; Director of Cooper's, Inc. 59 Portfolios
              08543-9095                               since 1999; Chairman of the Board thereof since
              Age: 60                                  2000; Director of ECMC, Inc. since 2001.
- ------------------------------------------------------------------------------------------------------------------------------------
Robert S.     P.O. Box 9095   Trustee      2002 to     Principal of STI Management since 1994; Trustee   40 Funds      None
Salomon, Jr.  Princeton, NJ                present     of Commonfund from 1980 to 2001; Director of      59 Portfolios
              08543-9095                               Rye Country Day School since 2001.
              Age: 66
- ------------------------------------------------------------------------------------------------------------------------------------
Stephen B.    P.O. Box 9095   Trustee      2002 to     Chairman, Fernwood Advisors (investment adviser)  40 Funds      None
Swensrud      Princeton, NJ                present     since 1996; Principal of Fernwood Associates      59 Portfolios
              08543-9095                               (financial consultant) since 1975; Chairman of
              Age: 70                                  RPP Corporation since 1978; Director,
                                                       International Mobile Communications, Inc. since
                                                       1998.
              ----------------------------------------------------------------------------------------------------------------------
              *  The Trustee's term is unlimited. Trustees serve until their resignation, removal or death, or until December 31 of
                 the year in which they turn 72.
- ------------------------------------------------------------------------------------------------------------------------------------


                              Position(s)  Length
                              Held         of Time
Name          Address & Age   with Fund    Served*     Principal Occupation(s) During Past 5 Years
====================================================================================================================================
        Trust Officers
- ------------------------------------------------------------------------------------------------------------------------------------
                                           
Donald C.     P.O. Box 9011   Vice         1993 to     First Vice President of FAM and MLIM since 1997 and Treasurer thereof since
Burke         Princeton, NJ   President    present     1999; Senior Vice President and Treasurer of Princeton Services since 1999;
              08543-9011      and          and 1999    Vice President of FAMD since 1999; Director of MLIM Taxation since 1990.
              Age: 43         Treasurer    to present
- ------------------------------------------------------------------------------------------------------------------------------------
Kenneth A.    P.O. Box 9011   Senior Vice  2002 to     Managing Director of MLIM since 2000; Director (Municipal Tax-Exempt Fund
Jacob         Princeton, NJ   President    present     Management) of MLIM from 1997 to 2000.
              08543-9011
              Age: 52
- ------------------------------------------------------------------------------------------------------------------------------------
John M.       P.O. Box 9011   Senior Vice  2002 to     Managing Director of MLIM since 2000; Director (Municipal Tax-Exempt Fund
Loffredo      Princeton, NJ   President    present     Management) of MLIM from 1998 to 2000.
              08543-9011
              Age: 39
- ------------------------------------------------------------------------------------------------------------------------------------
William R.    P.O. Box 9011   Vice         1997 to     Vice President of MLIM since 1994.
Bock          Princeton, NJ   President    present
              08543-9011
              Age: 67
- ------------------------------------------------------------------------------------------------------------------------------------
Brian D.      P.O. Box 9011   Secretary    2003 to     Vice President of MLIM since 2002; Attorney with Reed Smith from 2001 to
Stewart       Princeton, NJ                present     2002; Attorney with Saul Ewing from 1999 to 2001.
              08543-9011
              Age: 34
              ----------------------------------------------------------------------------------------------------------------------
              *  Officers of the Trust serve at the pleasure of the Board of Trustees.
- ------------------------------------------------------------------------------------------------------------------------------------
              Further information about the Trust's Officers and Trustees is available in the Trust's Statement of Additional
              Information, which can be obtained without charge by calling 1-800-MER-FUND.
- ------------------------------------------------------------------------------------------------------------------------------------


Custodian

State Street Bank and Trust Company
P.O. Box 351
Boston, MA 02101

Transfer Agent

Financial Data Services, Inc.
4800 Deer Lake Drive East
Jacksonville, FL 32246-6484
800-637-3863


       MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND      JULY 31, 2003      27


[LOGO] Merrill Lynch Investment Managers                         www.mlim.ml.com

This report is not authorized for use as an offer of sale or a solicitation of
an offer to buy shares of the Fund 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.

A description of the policies and procedures that the Fund uses to determine how
to vote proxies relating to portfolio securities is available (1) without
charge, upon request, by calling toll-free 1-800-MER-FUND (1-800-637-3863); (2)
on www.mutualfunds.ml.com; and (3) on the Securities and Exchange Commission's
website at http://www.sec.gov.

Merrill Lynch Pennsylvania Municipal Bond Fund of
Merrill Lynch Multi-State Municipal Series Trust
Box 9011
Princeton, NJ
08543-9011

                                                                  #11299 -- 7/03


Item 2 - Did registrant adopt 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, principal accounting
         officer or controller, or persons performing similar functions,
         regardless of whether these individuals are employed by the registrant
         or a third party? If not, why not? Briefly describe any amendments or
         waivers that occurred during the period. State here if code of
         ethics/amendments/waivers are on website and give website address-.
         State here if fund will send code of ethics to shareholders without
         charge upon request--

         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 upon request by calling
         toll-free 1-800-MER-FUND (1-800-637-3863).

Item 3 - Did the registrant's board of directors determine that the registrant
         either: (i) has at least one audit committee financial expert serving
         on its audit committee; or (ii) does not have an audit committee
         financial expert serving on its audit committee? If yes, disclose name
         of financial expert and whether he/she is "independent," (fund may, but
         is not required, to disclose name/independence of more than one
         financial expert) If no, explain why not. -

         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) Joe Grills, (2) Andre Perold, (3) Robert S.
         Salomon, Jr., and (4) Stephen B. Swensrud.

Item 4 - Disclose annually only (not answered until December 15, 2003)

      (a) Audit Fees - Disclose aggregate fees billed for each of the last two
                       fiscal years for professional services rendered by the
                       principal accountant for the audit of the registrant's
                       annual financial statements or services that are
                       normally provided by the accountant in connection with
                       statutory and regulatory filings or engagements for
                       those fiscal years. N/A.

      (b) Audit-Related Fees - Disclose aggregate fees billed in each of the
                               last two fiscal years for assurance and related
                               services by the principal accountant that are
                               reasonably related to the performance of the
                               audit of the registrant's financial statements
                               and are not reported under paragraph (a) of this
                               Item. Registrants shall describe the nature of
                               the services comprising the fees disclosed under
                               this category. N/A.

      (c) Tax Fees - Disclose aggregate fees billed in each of the last two
                     fiscal years for professional services rendered by the
                     principal accountant for tax compliance, tax advice, and
                     tax planning. Registrants shall describe the nature of the
                     services comprising the fees disclosed under this category.
                     N/A.

      (d) All Other Fees - Disclose aggregate fees billed in each of the last
                           two fiscal years for products and services provided
                           by the principal accountant, other than the services
                           reported in paragraphs (a) through (c) of this Item.
                           Registrants shall describe the nature of the
                           services comprising the fees disclosed under this
                           category. N/A.


      (e)(1) Disclose the audit committee's pre-approval policies and procedures
             described in paragraph (c)(7) of Rule 2-01 of Regulation S-X. N/A.

      (e)(2) Disclose the percentage of services described in each of paragraphs
             (b) through (d) of this Item that were approved by the audit
             committee pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of
             Regulation S-X. N/A.

      (f)   If greater than 50%, disclose the percentage of hours expended on
            the principal accountant's engagement to audit the registrant's
            financial statements for the most recent fiscal year that were
            attributed to work performed by persons other than the principal
            accountant's full-time, permanent employees. N/A.

      (g)   Disclose the aggregate non-audit fees billed by the registrant's
            accountant for services rendered to the registrant, and rendered to
            the registrant's investment adviser (not including any sub-adviser
            whose role is primarily portfolio management and is subcontracted
            with or overseen by another investment adviser), and any entity
            controlling, controlled by, or under common control with the adviser
            that provides ongoing services to the registrant for each of the
            last two fiscal years of the registrant. N/A.

      (h)   Disclose whether the registrant's audit committee has considered
            whether the provision of non-audit services that were rendered to
            the registrant's investment adviser (not including any subadviser
            whose role is primarily portfolio management and is subcontracted
            with or overseen by another 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. N/A.

Item 5 - If the registrant is a listed issuer as defined in Rule 10A-3 under the
         Exchange Act, state whether or not the registrant has a
         separately-designated standing audit committee established in
         accordance with Section 3(a)(58)(A) of the Exchange Act. If the
         registrant has such a committee, however designated, identify each
         committee member. If the entire board of directors is acting as the
         registrant's audit committee in Section 3(a)(58)(B) of the Exchange
         Act, so state.

         If applicable, provide the disclosure required by Rule 10A-3(d) under
         the Exchange Act regarding an exemption from the listing standards for
         audit committees. N/A

         (Listed issuers must be in compliance with the new listing rules by the
         earlier of their first annual shareholders meeting after January 2004,
         or October 31, 2004 (annual requirement))

Item 6 - Reserved

Item 7 - For closed-end funds that contain voting securities in their portfolio,
         describe the policies and procedures that it uses to determine how to
         vote proxies relating to those portfolio securities. N/A

Item 8 -- Reserved


Item 9(a) - The registrant's certifying officers have reasonably designed such
            disclosure controls and procedures to ensure material information
            relating to the registrant is made known to us by others
            particularly during the period in which this report is being
            prepared. The registrant's certifying officers have determined that
            the registrant's disclosure controls and procedures are effective
            based on our evaluation of these controls and procedures as of a
            date within 90 days prior to the filing date of this report.

Item 9(b) -- There were no significant changes in the registrant's internal
             controls or in other factors that could significantly affect these
             controls subsequent to the date of their evaluation, including any
             corrective actions with regard to significant deficiencies and
             material weaknesses.

Item 10 - Exhibits

10(a) - Attach code of ethics or amendments/waivers, unless code of ethics or
        amendments/waivers is on website or offered to shareholders upon request
        without charge. N/A.

10(b) - Attach certifications pursuant to Section 302 of the Sarbanes-Oxley Act.
        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.

Merrill Lynch Pennsylvania Municipal Bond Fund


By: /s/ Terry K. Glenn
    --------------------------------
    Terry K. Glenn,
    President of
    Merrill Lynch Pennsylvania Municipal Bond Fund

Date: September 23, 2003

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/ Terry K. Glenn
    --------------------------------
    Terry K. Glenn,
    President of
    Merrill Lynch Pennsylvania Municipal Bond Fund

Date: September 23, 2003


By: /s/ Donald C. Burke
    --------------------------------
    Donald C. Burke,
    Chief Financial Officer of
    Merrill Lynch Pennsylvania Municipal Bond Fund

Date: September 23, 2003


Attached hereto as a furnished exhibit are the certifications pursuant to
Section 906 of the Sarbanes-Oxley Act.