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 811-5011

Name of Fund: CMA Arizona Municipal Money Fund
              CMA 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, CMA Arizona
      Municipal Money Fund of CMA Multi-State Municipal Series Trust, 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: 03/31/04

Date of reporting period: 04/01/03 - 03/31/04

Item 1 - Report to Stockholders



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                                        CMA Arizona
                                        Municipal Money Fund

Annual Report
March 31, 2004



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CMA Arizona Municipal Money Fund

Important Tax Information (unaudited)

All of the net investment income distributions paid by CMA Arizona Municipal
Money Fund of CMA Multi-State Municipal Series Trust during the taxable year
ended March 31, 2004 qualify as tax-exempt interest dividends for Federal income
tax purposes.

Please retain this information for your records.

Electronic Delivery

The Fund offers 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       CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004


A Letter From the President

Dear Shareholder

Index returns during the most recent six-month and 12-month reporting periods
indicate that fixed income markets -- both taxable and tax-exempt -- continued
to reward those investors who were willing to accept greater risk. The high
yield market, as measured by the Credit Suisse First Boston High Yield Index,
provided a six-month return of +8.65% and a 12-month return of +22.86% as of
March 31, 2004. By comparison, the Lehman Brothers Aggregate Bond Index returned
+2.98% and +5.40% and the Lehman Brothers Municipal Bond Index returned +3.12%
and +5.86% for the six-month and 12-month periods ended March 31, 2004,
respectively.

As of March month-end, the Federal Reserve Board maintained its accommodative
policy stance, pledging "patience" in raising interest rates. As a result,
short-term interest rates remained at historic lows and kept the short end of
the yield curve relatively flat, making it increasingly difficult to find
attractive income opportunities. Market watchers continue to monitor the
economic data and Federal Reserve Board language for indications of interest
rate direction. Having said that, if the economy continues to grow at its recent
pace, many believe it is just a matter of time before interest rates move
upward.

Equity markets, in the meantime, continued to provide attractive returns. For
the six-month and 12-month periods ended March 31, 2004, the Standard & Poor's
500 Index returned +14.08% and +35.12%, respectively. Much of the boost came
from improving economic conditions throughout the past year. Significant fiscal
and monetary stimulus, including the low interest rates and tax cuts, has opened
the door to consumer spending, capital spending, increases in exports and
long-awaited job growth. As expected, these positive developments have led the
way to improvements in corporate earnings -- a positive for stock markets.

The events and efforts of the past year leave us with a much stronger economy
today. With all of this in mind, we believe it is time for investors to consider
what can go right in 2004. We encourage you to revisit your portfolio and your
asset allocation strategy to ensure you are well positioned to take advantage of
the opportunities that lie ahead. Your financial advisor can help you develop a
strategy designed to perform through all types of market and economic cycles.

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


        CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004         3


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A Discussion With Your Fund's Portfolio Manager

      With interest rates holding at historic lows, we looked to purchase
one-year fixed rate paper throughout the period, but used variable rate demand
notes opportunistically for yield enhancement.

How did the Fund perform during the fiscal year in light of the existing market
conditions?

For the 12-month period ended March 31, 2004, CMA Arizona Municipal Money Fund
paid shareholders a net annualized yield of .35%.* As of March 31, 2004, the
Fund's seven-day yield was .32%.

Much of the fiscal year was characterized by an accommodative Federal Reserve
Board, which was content to keep interest rates at historically low levels. The
last in a series of interest rate cuts came in June 2003, as the Federal Reserve
Board looked to stimulate economic growth and ward off the potential for
deflation. Although economic growth began to accelerate later in the year,
concerns over weak job growth persisted in the market.

Investors tried to anticipate when the Federal Reserve Board would restore
interest rates to more neutral levels. The constant interest rate analysis
translated into widespread volatility, which created opportunities in the fixed
income markets throughout the past 12 months.

Describe conditions in the State of Arizona during the period.

Unlike many other states, Arizona's economy performed relatively well during the
past year. As the period began, the state's payrolls continued to expand, fueled
especially by strength in the services and construction sectors. Contracts for
the defense industry -- a large presence in Arizona -- provided substantial
revenues for the state, and growth in technology employment further fueled
optimism about the economy's expansion potential.

The pace of Arizona's recovery quickened during the second half of the period as
healthy population growth and a strong retail sector propelled the state's
economy. The labor market continued to show improvement, with the state's
employment rising well past its 2001 peak. Finally, Arizona's tourism industry
began to regain strength.

Notwithstanding the positive developments, the national recession, along with a
series of tax cuts enacted during better economic times, left the state with a
$309.5 million revenue shortfall in the fiscal year 2003 budget. The gap was
closed through a combination of strategies, including layoffs, asset sales, bond
issuance and transfers from the state's Budget Stabilization Fund.

What changes were made to the portfolio during the period?

As the fiscal year began, we were looking to increase the Fund's position in
variable rate securities for liquidity purposes. These securities tend to have
shorter maturities and, given the inverted yield curve at that time,
shorter-maturity investments were offering higher yields than their
longer-maturity counterparts. We also expected yields on variable rate products
to spike because of redemptions related to tax time. The Fund benefited from
this strategy, as variable rate demand notes offered an average yield of 1.25%
versus 1.10% for one-year fixed rate paper.

As summer approached, variable rate securities became less attractive as
concerns about deflation and the expectation for additional interest rate cuts
caused yields on shorter-maturity securities to drop. After the Federal Reserve
Board's final interest rate cut in June 2003, we expected monetary policy would
be on hold for at least the next six months. With that in mind, we were
comfortable to increase the Fund's weighting in fixed rate securities, extending
the portfolio's average maturity from 29 days to approximately 48 days by
September 30, 2003.

The final months of 2003 brought evidence of a recovering economy, but inflation
remained modest and the job market continued to be sluggish. Under these
circumstances, we felt that short-term interest rates would remain at current
low levels well into 2004. As a result, we continued to look for opportunities
to invest in fixed rate Arizona paper, although insufficient supply at this time
made our strategy a challenge.

*     Based on a constant investment throughout the period, with dividends
      compounded daily, and reflecting a net return to the investor after all
      expenses.


4       CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004


Although we continued to search for fixed rate paper in the new year, the
flatness of the short-term tax-exempt yield curve offered little incentive to
extend further out. As the period came to an end, we were looking to increase
our weighting in variable rate paper -- again seeking to take advantage of
higher yields typically available during tax season.

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

The Fund ended the period in a slightly bearish stance given the lack of
attractive investment opportunities over the past few months. We believe the
Fund's increased weighting in variable rate demand notes as of March 31, 2004
will allow us to benefit from the traditional increase in yields associated with
tax-related selling, at least in the upcoming quarter. Looking further ahead, we
expect the Federal Reserve Board will likely keep monetary policy on hold well
into 2004 to ensure a sustainable economic recovery. With that in mind, we will
continue to look for opportunities to extend the portfolio's average maturity
when prudent.

Darrin J. SanFillippo
Vice President and Portfolio Manager

April 7, 2004


        CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004         5


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Schedule of Investments                                           (in Thousands)



                     Face
                     Amount      Municipal Bonds                                                                        Value
==============================================================================================================================
Arizona--88.3%
- ------------------------------------------------------------------------------------------------------------------------------
                                                                                                              
                     $   480     Apache County, Arizona, Ganado Unified School District No. 20, Impact Aid
                                 Revenue Bonds, GO, Series A, 2% due 7/01/2004 (b)                                     $   481
                     ---------------------------------------------------------------------------------------------------------
                         875     Apache County, Arizona, IDA, IDR (Tucson Electric Power Co.), VRDN, Series 83-A,
                                 1.05% due 12/15/2018 (a)                                                                  875
                     ---------------------------------------------------------------------------------------------------------
                       7,250     Arizona School District, TAN (Financing Program), COP, 1.75% due 7/30/2004              7,268
                     ---------------------------------------------------------------------------------------------------------
                       3,130     Arizona School Facilities Board, State School Improvement Revenue Bonds, 5.25%
                                 due 7/01/2004                                                                           3,163
                     ---------------------------------------------------------------------------------------------------------
                       1,295     Arizona State, COP, Refunding, 5% due 3/01/2005 (c)                                     1,340
                     ---------------------------------------------------------------------------------------------------------
                       2,550     Arizona State Transportation Board Revenue Bonds, GAN, 0.50% due 1/01/2005              2,625
                     ---------------------------------------------------------------------------------------------------------
                         600     Arizona State University Revenue Bonds, VRDN, Series B, 1% due 7/01/2034 (a)(b)           600
                     ---------------------------------------------------------------------------------------------------------
                       2,500     Arizona State University Revenue Refunding Bonds, VRDN, Series II-R-174, 1.08%
                                 due 7/01/2009 (a)(d)                                                                    2,500
                     ---------------------------------------------------------------------------------------------------------
                       2,250     Avondale, Arizona, IDA, IDR, Refunding (National Health Investors), VRDN, 1.07%
                                 due 12/01/2014 (a)                                                                      2,250
                     ---------------------------------------------------------------------------------------------------------
                         545     Buckeye, Arizona, Union High School District No. 201, School Improvement Project
                                 of 2002, GO, Series A, 2.50% due 7/01/2004 (d)                                            547
                     ---------------------------------------------------------------------------------------------------------
                       2,350     Casa Grande, Arizona, IDA, IDR (Price Companies Inc. Project), VRDN, AMT,
                                 Series A, 1.15% due 12/01/2017 (a)                                                      2,350
                     ---------------------------------------------------------------------------------------------------------
                       1,125     Chandler, Arizona, IDA, IDR (Red Rock Stamping Company Project), VRDN, AMT, 1.20%
                                 due 2/01/2020 (a)                                                                       1,125
                     ---------------------------------------------------------------------------------------------------------
                       5,700     Coconino County, Arizona, Pollution Control Corporation Revenue Bonds (Arizona
                                 Public Service Co.--Navajo Project), VRDN, AMT, Series A, 1.13% due 10/01/2029 (a)      5,700
                     ---------------------------------------------------------------------------------------------------------
                         300     Coconino County, Arizona, Unified School District No. 15 (Tuba City 2001
                                 Project), Revenue Bonds, Series A, 3% due 7/01/2004 (c)                                   301
                     ---------------------------------------------------------------------------------------------------------
                       4,400     Cochise County, Arizona, Pollution Control Corporation, Solid Waste Disposal
                                 Revenue Bonds (Arizona Electric Power Cooperative Inc. Project), VRDN, Put, AMT,
                                 1% due 9/01/2004 (a)                                                                    4,400
                     ---------------------------------------------------------------------------------------------------------
                         500     Greater Arizona Development Authority, Infrastructure Revenue Bonds, Series A,
                                 5% due 8/01/2004                                                                          506
                     ---------------------------------------------------------------------------------------------------------
                       1,000     Maricopa County, Arizona, Community College District, GO (Project of 1994),
                                 Series D, 4% due 7/01/2004                                                              1,008
                     ---------------------------------------------------------------------------------------------------------
                       5,175     Maricopa County, Arizona, IDA, IDR (Trans-Matic Manufacturing Production Project),
                                 VRDN, AMT, 1.10% due 10/01/2026 (a)                                                     5,175
                     ---------------------------------------------------------------------------------------------------------
                       6,000     Maricopa County, Arizona, IDA, M/F Housing Revenue Bonds (San Angelin Apartments
                                 LP), Put, AMT, 1.30% due 5/14/2004 (a)                                                  6,000
                     ---------------------------------------------------------------------------------------------------------
                                 Maricopa County, Arizona, IDA, M/F Housing Revenue Refunding Bonds VRDN, AMT (a)(g):
                       2,540          (Las Gardenias Apartments LP Project), Series A, 1.08% due 4/15/2033               2,540
                       4,800          (San Martin Apartments Project), Series A-1, 1.08% due 6/15/2035                   4,800
                       4,000          (San Remo Apartments Project), 1.08% due 9/15/2035                                 4,000
                       5,000          (Villas Solanas Apartments), Series A, 1.08% due 11/15/2032                        5,000
                     ---------------------------------------------------------------------------------------------------------
                                 Maricopa County, Arizona, IDA, S/F Mortgage Revenue Bonds (a):
                      15,464          FLOATS, AMT, Series 707, 1.15% due 12/01/2036                                     15,465
                       6,859          VRDN, Series A, 1.139% due 8/01/2006                                               6,859


Portfolio Abbreviations for CMA Arizona Municipal Money Fund

AMT      Alternative Minimum Tax (subject to)
COP      Certificates of Participation
CP       Commercial Paper
FLOATS   Floating Rate Securities
GAN      Grant Anticipation Notes
GO       General Obligation Bonds
IDA      Industrial Development Authority
IDR      Industrial Development Revenue Bonds
M/F      Multi-Family
MERLOTS  Municipal Extendible Receipt Liquidity Option Tender Securities
S/F      Single-Family
TAN      Tax Anticipation Notes
VRDN     Variable Rate Demand Notes


6       CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004


Schedule of Investments (concluded)                               (in Thousands)



                     Face
                     Amount      Municipal Bonds                                                                        Value
==============================================================================================================================
Arizona (concluded)
- ------------------------------------------------------------------------------------------------------------------------------
                                                                                                             
                     $ 4,000     Phoenix, Arizona, Civic Improvement Corporation, Excise Tax Revenue Bonds
                                 (Apartment Improvements), Subordinated, VRDN, AMT, 1.05% due 6/01/2020 (a)           $  4,000
                     ---------------------------------------------------------------------------------------------------------
                                 Phoenix, Arizona, IDA, M/F Housing Revenue Bonds, VRDN (a):
                       1,000          (Bell Square Apartments Project), 1.08% due 6/01/2025                              1,000
                       8,420          (Mariners Pointe Apartments Project), AMT, Series A, 1.10% due 10/01/2023          8,420
                     ---------------------------------------------------------------------------------------------------------
                                 Phoenix, Arizona, IDA, M/F Housing Revenue Refunding Bonds, VRDN (a):
                       4,000          (Paradise Lakes Apartments Project), 1.08% due 7/01/2025                           4,000
                       3,800          (Westward Housing Apartments Project), AMT, Series A, 1.17% due 4/01/2033          3,800
                     ---------------------------------------------------------------------------------------------------------
                                 Phoenix, Arizona, IDA Revenue Bonds VRDN, AMT (a):
                         800          (Laich Industries Corp. Project), 1.20% due 9/01/2016                                800
                       3,060          (Swift Aviation Services Inc. Project), 1.19% due 7/01/2024                        3,060
                     ---------------------------------------------------------------------------------------------------------
                       9,072     Phoenix, Arizona, IDA, S/F Mortgage Revenue Bonds, VRDN, Series A, 1.11%
                                 due 5/01/2006 (a)                                                                       9,072
                     ---------------------------------------------------------------------------------------------------------
                       1,500     Pima County, Arizona, IDA, IDR, Refunding (Brush Wellman Inc. Project), VRDN,
                                 1.09% due 9/01/2009 (a)                                                                 1,500
                     ---------------------------------------------------------------------------------------------------------
                       4,770     Pima County, Arizona, IDA Revenue Bonds (Lease Purchase), VRDN, 1.12%
                                 due 6/01/2007 (a)                                                                       4,770
                     ---------------------------------------------------------------------------------------------------------
                         700     Pima County, Arizona, IDA, S/F Mortgage Revenue Bonds, VRDN, 1.08% due 2/04/2012 (a)      700
                     ---------------------------------------------------------------------------------------------------------
                                 Salt River Project, Arizona, Agricultural Improvement and Power District, Electric
                                 System Revenue Refunding Bonds, Series A:
                       2,500          5% due 1/01/2005                                                                   2,572
                         540          5.50% due 1/01/2005                                                                  558
                     ---------------------------------------------------------------------------------------------------------
                       1,145     Scottsdale, Arizona, Refunding, GO, 2% due 7/01/2004                                    1,148
                     ---------------------------------------------------------------------------------------------------------
                       4,600     Special Fund of Industrial Arizona, CP, 1.50% due 4/07/2004                             4,600
                     ---------------------------------------------------------------------------------------------------------
                       1,000     Tucson, Arizona, Airport Authority Inc., Special Revenue Bonds (LearJet Inc.),
                                 VRDN, AMT, Series A, 1.20% due 10/01/2028 (a)                                           1,000
                     ---------------------------------------------------------------------------------------------------------
                       2,315     Tucson, Arizona, IDA, IDR (Fluoresco Old Nogales Project), VRDN, AMT, 1.24%
                                 due 8/01/2025 (a)                                                                       2,315
                     ---------------------------------------------------------------------------------------------------------
                       3,710     Tucson, Arizona, IDA Revenue Bonds (United Way Capital Corporation Project),
                                 VRDN, 1.22% due 6/01/2021 (a)                                                           3,710
                     ---------------------------------------------------------------------------------------------------------
                       4,015     University of Arizona, COP, VRDN, Series RR-II-R-243, 1.08% due 6/01/2015 (a)(b)        4,015

==============================================================================================================================
Puerto Rico--11.7%
- ------------------------------------------------------------------------------------------------------------------------------
                       1,155     Puerto Rico Commonwealth, GO, MERLOTS, VRDN, Series A44, 1.04% due 7/01/2029 (a)(f)     1,155
                     ---------------------------------------------------------------------------------------------------------
                       3,000     Puerto Rico Commonwealth Revenue Bonds, FLOATS, VRDN, Series 03-L39J, 1.08%
                                 due 7/30/2004 (a)                                                                       3,000
                     ---------------------------------------------------------------------------------------------------------
                                 Puerto Rico Government Development Bank, CP:
                       8,394          0.95% due 5/07/2004                                                                8,394
                       3,000          0.97% due 6/07/2004                                                                3,000
                     ---------------------------------------------------------------------------------------------------------
                       4,000     Puerto Rico Public Buildings Authority, Revenue Refunding Bonds, FLOATS,
                                 Series 787, 1.05% due 7/08/2004 (a)(e)                                                  4,000
==============================================================================================================================
                                 Total Investments (Cost--$167,467*)--100.0%                                           167,467

                                 Liabilities in Excess of Other Assets--0.0%                                               (81)
                                                                                                                      --------
                                 Net Assets--100.0%                                                                   $167,386
                                                                                                                      ========


(a)   The interest rate is subject to change periodically based upon prevailing
      market rates. The interest rate shown is the rate in effect at March 31,
      2004.
(b)   AMBAC Insured.
(c)   MBIA Insured.
(d)   FSA Insured.
(e)   CIFG Insured.
(f)   FGIC Insured.
(g)   FNMA Collateralized.
*     Cost for Federal income tax purposes.

      See Notes to Financial Statements.


        CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004         7


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Statement of Assets and Liabilities


As of March 31, 2004
=====================================================================================================================
Assets
- ---------------------------------------------------------------------------------------------------------------------
                                                                                                
                   Investments, at value (identified cost--$167,466,502) .....                        $   167,466,502
                   Cash ......................................................                                 87,719
                   Interest receivable .......................................                                455,178
                   Prepaid expenses and other assets .........................                                  8,021
                                                                                                      ---------------
                   Total assets ..............................................                            168,017,420
                                                                                                      ---------------
=====================================================================================================================
Liabilities
- ---------------------------------------------------------------------------------------------------------------------
                   Payables:
                      Securities purchased ...................................    $       565,315
                      Distributor ............................................             33,118
                      Investment adviser .....................................             11,787
                      Other affiliates .......................................              3,582
                      Beneficial interest redeemed ...........................                183             613,985
                                                                                  ---------------
                   Accrued expenses ..........................................                                 17,564
                                                                                                      ---------------
                   Total liabilities .........................................                                631,549
                                                                                                      ---------------
=====================================================================================================================
Net Assets
- ---------------------------------------------------------------------------------------------------------------------
                   Net assets ................................................                        $   167,385,871
                                                                                                      ===============
=====================================================================================================================
Net Assets Consist of
- ---------------------------------------------------------------------------------------------------------------------
                   Shares of beneficial interest, $.10 par value, unlimited
                     number of shares authorized .............................                        $    16,744,836
                   Paid-in capital in excess of par ..........................                            150,703,413
                   Undistributed investment income--net ......................    $            45
                   Accumulated realized capital losses--net ..................            (62,423)
                                                                                  ---------------
                   Total accumulated losses--net .............................                                (62,378)
                                                                                                      ---------------
                   Net Assets--Equivalent to $1.00 per share based on
                     167,448,361 shares of beneficial interest outstanding ...                        $   167,385,871
                                                                                                      ===============


      See Notes to Financial Statements.


8       CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004


Statement of Operations


For the Year Ended March 31, 2004
=====================================================================================================================
Investment Income
- ---------------------------------------------------------------------------------------------------------------------
                                                                                                
                   Interest and amortization of premium and discount earned ..                        $     2,008,599
=====================================================================================================================
Expenses
- ---------------------------------------------------------------------------------------------------------------------
                   Investment advisory fees ..................................    $       917,090
                   Distribution fees .........................................            224,169
                   Professional fees .........................................             63,326
                   Accounting services .......................................             52,522
                   Registration fees .........................................             34,029
                   Printing and shareholder reports ..........................             20,108
                   Transfer agent fees .......................................             17,026
                   Custodian fees ............................................             12,170
                   Pricing fees ..............................................              6,470
                   Trustees' fees and expenses ...............................              1,870
                   Other .....................................................             11,825
                                                                                  ---------------
                   Total expenses before waiver ..............................          1,360,605
                   Waiver of expenses ........................................             (6,549)
                                                                                  ---------------
                   Total expenses after waiver ...............................                              1,354,056
                                                                                                      ---------------
                   Investment income--net ....................................                                654,543
                                                                                                      ---------------
=====================================================================================================================
Realized Gain on Investments--Net
- ---------------------------------------------------------------------------------------------------------------------
                   Realized gain on investments--net .........................                                 20,646
                                                                                                      ---------------
                   Net Increase in Net Assets Resulting from Operations ......                        $       675,189
                                                                                                      ===============


      See Notes to Financial Statements.


        CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004         9


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Statements of Changes in Net Assets



                                                                                           For the Year Ended
                                                                                               March 31,
                                                                                  -----------------------------------
Increase (Decrease) in Net Assets:                                                      2004                2003
=====================================================================================================================
Operations
- ---------------------------------------------------------------------------------------------------------------------
                                                                                                
                   Investment income--net ....................................    $       654,543     $     1,522,314
                   Realized gain on investments--net .........................             20,646                  --
                                                                                  -----------------------------------
                   Net increase in net assets resulting from operations ......            675,189           1,522,314
                                                                                  -----------------------------------
=====================================================================================================================
Dividends to Shareholders
- ---------------------------------------------------------------------------------------------------------------------
                   Dividends to shareholders from investment income--net .....           (654,543)         (1,522,314)
                                                                                  -----------------------------------
=====================================================================================================================
Beneficial Interest Transactions
- ---------------------------------------------------------------------------------------------------------------------
                   Net proceeds from sale of shares ..........................      1,253,844,182         864,504,814
                   Value of shares issued to shareholders in reinvestment of
                     dividends ...............................................            654,498           1,522,387
                                                                                  -----------------------------------
                                                                                    1,254,498,680         866,027,201
                   Cost of shares redeemed ...................................     (1,277,945,951)       (902,922,723)
                                                                                  -----------------------------------
                   Net decrease in net assets derived from beneficial interest
                     transactions ............................................        (23,447,271)        (36,895,522)
                                                                                  -----------------------------------
=====================================================================================================================
Net Assets
- ---------------------------------------------------------------------------------------------------------------------
                   Total decrease in net assets ..............................        (23,426,625)        (36,895,522)
                   Beginning of year .........................................        190,812,496         227,708,018
                                                                                  -----------------------------------
                   End of year* ..............................................    $   167,385,871     $   190,812,496
                                                                                  ===================================
                      * Undistributed investment income--net .................    $            45     $            45
                                                                                  ===================================


      See Notes to Financial Statements.


10      CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004


Financial Highlights



The following per share data and ratios have been derived
from information provided in the financial statements.                              For the Year Ended March 31,
                                                                -------------------------------------------------------------------
Increase (Decrease) in Net Asset Value:                             2004          2003           2002          2001           2000
===================================================================================================================================
Per Share Operating Performance
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                                           
                   Net asset value, beginning of year .......   $    1.00     $    1.00      $    1.00     $    1.00      $    1.00
                                                                -------------------------------------------------------------------
                   Investment income--net ...................          --+          .01            .02           .03            .03
                   Realized gain on investments--net ........          --+           --             --            --+            --+
                                                                -------------------------------------------------------------------
                   Total from investment operations .........          --+          .01            .02           .03            .03
                                                                -------------------------------------------------------------------
                   Less dividends from investment income--net          --++        (.01)          (.02)         (.03)          (.03)
                                                                -------------------------------------------------------------------
                   Net asset value, end of year .............   $    1.00     $    1.00      $    1.00     $    1.00      $    1.00
                                                                ===================================================================
                   Total investment return ..................         .35%          .77%          1.68%         3.37%          2.80%
                                                                ===================================================================
===================================================================================================================================
Ratios to Average Net Assets
- -----------------------------------------------------------------------------------------------------------------------------------
                   Expenses, net of waiver ..................         .74%          .72%           .71%          .74%           .71%
                                                                ===================================================================
                   Expenses .................................         .74%          .72%           .71%          .74%           .71%
                                                                ===================================================================
                   Investment income--net ...................         .36%          .78%          1.71%         3.31%          2.76%
                                                                ===================================================================
===================================================================================================================================
Supplemental Data
- -----------------------------------------------------------------------------------------------------------------------------------
                   Net assets, end of year (in thousands) ...   $ 167,386     $ 190,812      $ 227,708     $ 248,880      $ 227,210
                                                                ===================================================================


+     Amount is less than $.01 per share.
++    Amount is less than $(.01) per share.

      See Notes to Financial Statements.


        CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004        11


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Notes to Financial Statements

1. Significant Accounting Policies:

CMA Arizona Municipal Money Fund (the "Fund") is part of CMA 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
following is a summary of significant accounting policies followed by the Fund.

(a) Valuation of investments -- Investments are valued at amortized cost, which
approximates market value. For the purpose of valuation, the maturity of a
variable rate demand instrument is deemed to be the demand notice payment
period. In the case of a floating rate instrument, the remaining maturity is the
next coupon date on which the interest rate is to be adjusted.

(b) 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.

(c) 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. Interest income (including amortization of premium and
discount) is recognized on the accrual basis.

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

(e) Dividends and distributions to shareholders -- The Fund declares dividends
daily and reinvests daily such dividends (net of non-resident alien tax and
backup withholding tax withheld) in additional fund shares at net asset value.
Dividends are declared from the total of net investment income, excluding
discounts earned other than original issue discounts. Net realized capital
gains, if any, are normally distributed annually after deducting prior years'
loss carryforward. The Fund may distribute capital gains more frequently than
annually in order to maintain the Fund's net asset value at $1.00 per share.

(f) 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.

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: .50% of the first $500 million of average daily net assets; .425%
of average daily net assets in excess of $500 million but not exceeding $1
billion; and .375% of average daily net assets in excess of $1 billion. For the
year ended March 31, 2004, FAM earned fees of $917,090, of which $6,549 was
waived.

Pursuant to the Distribution and Shareholder Servicing Plan in compliance with
Rule 12b-1 under the Investment Company Act of 1940, Merrill Lynch, Pierce,
Fenner & Smith Incorporated ("MLPF&S") receives a distribution fee from the Fund
at the end of each month at the annual rate of .125% of average daily net assets
of the Fund. The distribution fee is to compensate MLPF&S financial advisors and
other directly involved branch office personnel for selling shares of the Fund
and for providing direct personal services to shareholders. The distribution fee
is not compensation for the administrative and operational services rendered to
the Fund by MLPF&S in processing share orders and administering shareholder
accounts.

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

For the year ended March 31, 2004, the Fund reimbursed FAM $3,814 for certain
accounting services.

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


12      CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004


Notes to Financial Statements (concluded)

3. Shares of Beneficial Interest:

The number of shares sold, reinvested and redeemed during the periods
corresponds to the amounts included in the Statements of Changes in Net Assets
for net proceeds from sale of shares, value of shares reinvested and cost of
shares redeemed, respectively, since shares are recorded at $1.00 per share.

4. Distributions to Shareholders:

The tax character of distributions paid during the fiscal years ended March 31,
2004 and March 31, 2003 was as follows:

- --------------------------------------------------------------------------------
                                                   3/31/2004           3/31/2003
- --------------------------------------------------------------------------------
Distributions paid from:
   Tax-exempt income .........................    $  654,543          $1,522,314
                                                  ------------------------------
Total distributions ..........................    $  654,543          $1,522,314
                                                  ==============================

As of March 31, 2004, there were no significant differences between the book and
tax components of net assets.

5. Capital Loss Carryforward:

At March 31, 2004, the Fund had a net capital loss carryforward of approximately
$62,423, of which $15,236 expires in 2005, $5,580 expires in 2006, $5,514
expires in 2007, $10,340 expires in 2008 and $25,753 expires in 2009. This
amount will be available to offset like amounts of any future taxable gains.

Independent Auditors' Report

To the Shareholders and Board of Trustees of
CMA Multi-State Municipal Series Trust:

We have audited the accompanying statement of assets and liabilities, including
the schedule of investments, of CMA Arizona Municipal Money Fund of CMA
Multi-State Municipal Series Trust (the "Trust") as of March 31, 2004, 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 Trust'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 March 31, 2004, 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 CMA
Arizona Municipal Money Fund of CMA Multi-State Municipal Series Trust as of
March 31, 2004, 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
May 14, 2004


        CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004        13


[LOGO] Merrill Lynch Investment Managers

Officers and Trustees (unaudited)



                                                                                                       Number of
                                                                                                       Portfolios in   Other Public
                           Position(s)  Length of                                                      Fund Complex    Directorships
                           Held with    Time                                                           Overseen by     Held by
Name        Address & Age  Fund         Served   Principal Occupation(s) During Past 5 Years           Trustee         Trustee
====================================================================================================================================
Interested Trustee
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                     
Terry K.    P.O. Box 9011  President    1999 to  President of the Merrill Lynch Investment Managers,   124 Funds       None
Glenn*      Princeton, NJ  and          present  L.P. ("MLIM")/Fund Asset Management, L.P.             160 Portfolios
            08543-9011     Trustee      and      ("FAM")--Advised Funds since 1999; Chairman
            Age: 63                     1997 to  (Americas Region) of MLIM from 2000 to 2002;
                                        present  Executive Vice President of MLIM and FAM (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. since 1985.

            ------------------------------------------------------------------------------------------------------------------------
            * Mr. Glenn is a director, trustee or member of an advisory board of certain other investment companies for which MLIM
              or FAM acts as investment adviser. Mr. Glenn is an "interested person," as described in the Investment Company Act, of
              the Fund based on his former positions with MLIM, FAM, 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 Fund President, Mr. Glenn serves at the pleasure of the Board of Trustees.

====================================================================================================================================
Independent Trustees*
- ------------------------------------------------------------------------------------------------------------------------------------
Ronald W.   P.O. Box 9095  Trustee      1988 to  Professor Emeritus of Finance, School of Business,    51 Funds        None
Forbes      Princeton, NJ               present  State University of New York at Albany since 2000     50 Portfolios
            08543-9095                           and Professor thereof from 1989 to 2000;
            Age: 63                              International Consultant at the Urban Institute
                                                 from 1995 to 1999.
- ------------------------------------------------------------------------------------------------------------------------------------
Cynthia A.  P.O. Box 9095  Trustee      1994 to  Professor, Harvard Business School since 1989.        51 Funds        Newell
Montgomery  Princeton, NJ               present                                                        50 Portfolios   Rubbermaid,
            08543-9095                                                                                                 Inc.
            Age: 51
- ------------------------------------------------------------------------------------------------------------------------------------
Kevin A.    P.O. Box 9095  Trustee      1992 to  Director Emeritus of The Boston University Center     51 Funds        None
Ryan        Princeton, NJ               present  for the Advancement of Ethics and Character from      50 Portfolios
            08543-9095                           1989 to 1999; Professor of Education at Boston
            Age: 71                              University from 1982 to 1999 and Professor Emeritus
                                                 thereof since 1999.
- ------------------------------------------------------------------------------------------------------------------------------------
Roscoe S.   P.O. Box 9095  Trustee      2000 to  President of Middle East Institute from 1995 to       51 Funds        None
Suddarth    Princeton, NJ               present  2001; Foreign Service Officer of United States        50 Portfolios
            08543-9095                           Foreign Service from 1961 to 1995 and Career
            Age: 68                              Minister thereof from 1989 to 1995; Deputy
                                                 Inspector General of U.S. Department of State from
                                                 1991 to 1994; U.S. Ambassador to the Hashemite
                                                 Kingdom of Jordan from 1987 to 1990.
- ------------------------------------------------------------------------------------------------------------------------------------
Richard R.  P.O. Box 9095  Trustee      1988 to  Professor of Finance, New York University,            51 Funds        Bowne & Co.,
West        Princeton, NJ               present  Leonard N. Stern School of Business Administration    50 Portfolios   Inc.; Vornado
            08543-9095                           from 1982 to 1994 and Dean Emeritus thereof                           Operating
            Age: 66                              since 1994.                                                           Company;
                                                                                                                       Vornado
                                                                                                                       Realty Trust
                                                                                                                       and
                                                                                                                       Alexander's,
                                                                                                                       Inc.



14      CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004


Officers and Trustees (unaudited) (concluded)



                                                                                                       Number of
                                                                                                       Portfolios in   Other Public
                           Position(s)  Length of                                                      Fund Complex    Directorships
                           Held with    Time                                                           Overseen by     Held by
Name        Address & Age  Fund         Served   Principal Occupation(s) During Past 5 Years           Trustee         Trustee
====================================================================================================================================
Independent Trustees* (concluded)
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                     
Edward D.   P.O. Box 9095  Trustee      2000 to  Self-employed financial consultant since 1994;        51 Funds        None
Zinbarg     Princeton, NJ               present  Executive Vice President of The Prudential            50 Portfolios
            08543-9095                           Insurance Company of America from 1988 to
            Age: 69                              1994; Former Director of Prudential Reinsurance
                                                 Company and former Trustee of The Prudential
                                                 Foundation.
            ------------------------------------------------------------------------------------------------------------------------
            * 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 of
                            Held with    Time
Name         Address & Age  Fund         Served*  Principal Occupation(s) During Past 5 Years
====================================================================================================================================
Fund Officers
- ------------------------------------------------------------------------------------------------------------------------------------
                                     
Donald C.    P.O. Box 9011  Vice         1993 to  First Vice President of MLIM and FAM since 1997 and Treasurer thereof since 1999;
Burke        Princeton, NJ  President    present  Senior Vice President and Treasurer of Princeton Services since 1999; Vice
             08543-9011     and          and      President of FAMD since 1999; Director of MLIM Taxation since 1990.
             Age: 43        Treasurer    1999 to
                                         present
- ------------------------------------------------------------------------------------------------------------------------------------
Kenneth A.   P.O. Box 9011  Senior Vice  2002 to  Managing Director of MLIM since 2000; Director (Tax-Exempt Fund Management) of
Jacob        Princeton, NJ  President    present  MLIM from 1997 to 2000.
             08543-9011
             Age: 53
- ------------------------------------------------------------------------------------------------------------------------------------
John M.      P.O. Box 9011  Senior Vice  2002 to  Managing Director of MLIM since 2000; Director (Tax-Exempt Fund Management) of
Loffredo     Princeton, NJ  President    present  MLIM from 1998 to 2000.
             08543-9011
             Age: 40
- ------------------------------------------------------------------------------------------------------------------------------------
Darrin J.    P.O. Box 9011  Vice         1996 to  Vice President of MLIM since 1998.
SanFillippo  Princeton, NJ  President    present
             08543-9011
             Age: 39
- ------------------------------------------------------------------------------------------------------------------------------------
Phillip S.   P.O. Box 9011  Secretary    2000 to  First Vice President of MLIM since 2001; Director (Legal Advisory) from 2000
Gillespie    Princeton, NJ               present  to 2001; Vice President from 1999 to 2000; Attorney associated with MLIM
             08543-9011                           since 1998.
             Age: 40
            ------------------------------------------------------------------------------------------------------------------------
            * Officers of the Fund serve at the pleasure of the Board of Trustees.
- ------------------------------------------------------------------------------------------------------------------------------------
            Further information about the Fund's Officers and Trustees is available in the Fund'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
800-221-7210**

**    For inquiries regarding your CMA account, call 800-CMA-INFO
      (800-262-4636).

- --------------------------------------------------------------------------------
Charles C. Reilly, Trustee of CMA Arizona Municipal Money Fund, has recently
retired. The Fund's Board of Trustees wishes Mr. Reilly well in his retirement.
- --------------------------------------------------------------------------------


        CMA ARIZONA MUNICIPAL MONEY FUND                MARCH 31, 2004        15


[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. An investment in the Fund is not insured or guaranteed by
the Federal Deposit Insurance Corporation or any other government agency.
Although the Fund seeks to preserve the value of your investment at $1.00 per
share, it is possible to lose money by investing in the Fund. Past performance
results shown in this report should not be considered a representation of future
performance, which will fluctuate. 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.

CMA Arizona Municipal Money Fund
of CMA Multi-State Municipal Series Trust
Box 9011
Princeton, NJ
08543-9011

                                                                  #16714 -- 3/04



Item 2 - Code of Ethics - The registrant has adopted a code of ethics, as of the
         end of the period covered by this report, that applies to the
         registrant's principal executive officer, principal financial officer
         and principal accounting officer, or persons performing similar
         functions. A copy of the code of ethics is available without charge
         upon request by calling toll-free 1-800-MER-FUND (1-800-637-3863).

Item 3 - Audit Committee Financial Expert - The registrant's board of directors
         has determined that (i) the registrant has the following audit
         committee financial experts serving on its audit committee and (ii)
         each audit committee financial expert is independent: (1) Ronald W.
         Forbes, (2) Richard R. West, and (3) Edward D. Zinbarg.

Item 4 - Principal Accountant Fees and Services

         (a) Audit Fees -            Fiscal Year Ending March 31, 2004 - $30,200
                                     Fiscal Year Ending March 31, 2003 - $34,164

         (b) Audit-Related Fees -    Fiscal Year Ending March 31, 2004 - $0
                                     Fiscal Year Ending March 31, 2003 - $0

         (c) Tax Fees -              Fiscal Year Ending March 31, 2004 - $5,200
                                     Fiscal Year Ending March 31, 2003 - $4,800

         The nature of the services include tax compliance, tax advice and tax
         planning.

         (d) All Other Fees -        Fiscal Year Ending March 31, 2004 - $0
                                     Fiscal Year Ending March 31, 2003 - $0

         (e)(1) The registrant's audit committee (the "Committee") has adopted
         policies and procedures with regard to the pre-approval of services.
         Audit, audit-related and tax compliance services provided to the
         registrant on an annual basis require specific pre-approval by the
         Committee. The Committee also must approve other non-audit services
         provided to the registrant and those non-audit services provided to the
         registrant's affiliated service providers that relate directly to the
         operations and the financial reporting of the registrant. Certain of
         these non-audit services that the Committee believes are a) consistent
         with the SEC's auditor independence rules and b) routine and recurring
         services that will not impair the independence of the independent
         accountants may be approved by the Committee without consideration on a
         specific case-by-case basis ("general pre-approval"). However, such
         services will only be deemed pre-approved provided that any individual
         project does not exceed $5,000 attributable to the registrant or
         $50,000 for the project as a whole. Any proposed services exceeding the
         pre-approved cost levels will require specific pre-approval by the
         Committee, as will any other services not subject to general
         pre-approval (e.g., unanticipated but permissible services). The
         Committee is informed of each service approved subject to general
         pre-approval at the next regularly scheduled in-person board meeting.

         (e)(2) 0%

         (f) Not Applicable

         (g) Fiscal Year Ending March 31, 2004 - $16,708,160
             Fiscal Year Ending March 31, 2003 - $17,378,427



         (h) The registrant's audit committee has considered and determined that
         the provision of non-audit services that were rendered to the
         registrant's investment adviser and any entity controlling, controlled
         by, or under common control with the investment adviser that provides
         ongoing services to the registrant that were not pre-approved pursuant
         to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible
         with maintaining the principal accountant's independence.

         Regulation S-X Rule 2-01(c)(7)(ii) - $541,640, 0%

Item 5 - Audit Committee of Listed Registrants - Not Applicable

Item 6 - Schedule of Investments - Not Applicable

Item 7 - Disclosure of Proxy Voting Policies and Procedures for Closed-End
         Management Investment Companies - Not Applicable

Item 8 - Purchases of Equity Securities by Closed-End Management Investment
         Company and Affiliated Purchasers - Not Applicable

Item 9 - Submission of Matters to a Vote of Security Holders - Not Applicable

Item 10 - Controls and Procedures

10(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.

10(b) - There were no changes in the registrant's internal control over
        financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR
        270.30a-3(d)) that occurred during the second fiscal half-year of the
        period covered by this report that has materially affected, or is
        reasonably likely to materially affect, the registrant's internal
        control over financial reporting.

Item 11 - Exhibits attached hereto

11(a)(1) - Code of Ethics - See Item 2

11(a)(2) - Certifications - Attached hereto

11(a)(3) - Not Applicable

11(b) - Certifications - Attached hereto

      Pursuant to the requirements of the Securities Exchange Act of 1934 and
      the Investment Company Act of 1940, the registrant has duly caused this
      report to be signed on its behalf by the undersigned, thereunto duly
      authorized.

      CMA Arizona Municipal Money Fund of CMA Multi-State Municipal Series Trust




      By: /s/ Terry K. Glenn
          ---------------------
          Terry K. Glenn,
          President of
          CMA Arizona Municipal Money Fund of CMA Multi-State Municipal
          Series Trust

      Date: May 21, 2004

      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
          CMA Arizona Municipal Money Fund of CMA Multi-State Municipal
          Series Trust

      Date: May 21, 2004


      By: /s/ Donald C. Burke
          ---------------------
          Donald C. Burke,
          Chief Financial Officer of
          CMA Arizona Municipal Money Fund of CMA Multi-State Municipal
          Series Trust

      Date: May 21, 2004