DREYFUS MASSACHUSETTS MUNICIPAL MONEY MARKET FUND
N-30D, 2000-10-05
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Dreyfus
Massachusetts
Municipal Money
Market Fund

SEMIANNUAL REPORT
July 31, 2000

(reg.tm)





The  views  expressed herein are current to the date of this report. These views
and  the  composition  of the fund's portfolio are subject to change at any time
based on market and other conditions.

           * Not FDIC-Insured * Not Bank-Guaranteed * May Lose Value


                                 Contents

                                 THE FUND
--------------------------------------------------

                             2   Letter from the President

                             3   Discussion of Fund Performance

                             6   Statement of Investments

                            10   Statement of Assets and Liabilities

                            11   Statement of Operations

                            12   Statement of Changes in Net Assets

                            13   Financial Highlights

                            14   Notes to Financial Statements

                                 FOR MORE INFORMATION
---------------------------------------------------------------------------

                                 Back Cover

                                                                       The Fund

                             Dreyfus Massachusetts  Municipal Money Market Fund

LETTER FROM THE PRESIDENT

Dear Shareholder:

We  are  pleased  to  present  this  semiannual report for Dreyfus Massachusetts
Municipal Money Market Fund, covering the six-month period from February 1, 2000
through  July  31,  2000.  Inside you'll find valuable information about how the
fund  was  managed  during the reporting period, including a discussion with the
fund's portfolio manager, Scott Sprauer.

Tighter  monetary  policy  adversely  affected most, but not all, sectors of the
money  markets  over the past six months. This was primarily a result of efforts
by  the  Federal  Reserve  Board (the "Fed") to forestall potential inflationary
pressures  in  a  fast-growing economy. The Fed raised short-term interest rates
three  times  during  the  reporting period, following three interest-rate hikes
implemented in the months before the reporting period began.

In  addition,  tax-exempt  money  market investments were strongly influenced by
their  own  supply-and-demand factors. This included a sharp reduction in demand
for  tax-exempt money market instruments during the income-tax season. In April,
these  forces  helped  yields  on  one-year  municipal notes reach their highest
levels in more than nine years.

We  appreciate  your  confidence over the past six months and we look forward to
your  continued  participation  in  Dreyfus Massachusetts Municipal Money Market
Fund.

Sincerely,


Stephen E. Canter
President and Chief Investment Officer
The Dreyfus Corporation
August 15, 2000




DISCUSSION OF FUND PERFORMANCE

Scott Sprauer, Portfolio Manager

How  did  Dreyfus  Massachusetts  Municipal Money Market Fund perform during the
period?

For  the  six-month  period ended July 31, 2000, the fund produced an annualized
yield  of  3.39%. Taking  into  account  the  effects  of compounding, the fund
provided an annualized effective yield of 3.44%.(1)

We  attribute  the  fund's performance to a rising interest-rate environment and
seasonal   supply-and-demand   influences,   which   helped  support  yields  of
Massachusetts municipal money market securities.

What is the fund's investment approach?

The  fund's  objective is to seek as high a level of current income exempt from
federal  and  Massachusetts  state  income  taxes  as  is  consistent  with  the
preservation of capital and the maintenance of liquidity. The fund also seeks to
maintain a stable $1.00 share price.

In  pursuing this objective, we employ two primary strategies. First, we attempt
to  add  value  by  constructing a diverse portfolio of high quality, tax-exempt
money  market instruments from Massachusetts issuers. Second, we actively manage
the  fund' s  average  maturity  in  anticipation  of  interest-rate  trends and
supply-and-demand changes in Massachusetts' short-term municipal marketplace.

For  example, if we expect an increase in short-term supply, we may decrease the
average  maturity  of the fund, which would enable us to purchase new securities
with  higher  yields. Yields tend to rise when there is an increase in new-issue
supply competing for investor interest. New securities generally are issued with
maturities  in  the  one-year  range  and  tend  to lengthen the fund's weighted
average    maturity.    If    we
                                                                        The Fund


DISCUSSION OF FUND PERFORMANCE (CONTINUED)

anticipate  limited  new-issue  supply,  we  may  extend the portfolio's average
maturity to maintain current yields for as long as practical. At other times, we
try  to  maintain  an  average  maturity  that  reflects  our view of short-term
interest-rate trends and future supply-and-demand considerations.

What other factors influenced the fund's performance?

The  fund  was  positively  influenced  over  the past six months by robust U.S.
economic growth, rising interest rates, seasonal supply-and-demand factors and a
declining supply of newly issued securities.

When the reporting period began on February 1, 2000, it had become apparent that
the U.S. economy was growing more strongly than many analysts expected. Consumer
confidence  reached  a  30-year  high,  oil  prices  were bouncing back from the
previous  year's  lows and unemployment remained low, with hourly wages rising.
These  economic  forces raised concerns that long-dormant inflationary pressures
might  reemerge.  In  response,  the  Federal  Reserve  Board (the "Fed") raised
short-term interest rates three times during the reporting period. When added to
the  three rate hikes implemented before the reporting period began, the Fed had
raised interest rates a total of 1.75 percentage points since June 1999.

Tax-exempt  money  markets  continued  to  be  influenced  by  strong  U.S.  and
Massachusetts economies throughout the reporting period. In general, this helped
to  keep state-specific tax-exempt money market instrument yields relatively low
compared   to  taxable  money  market  instruments  for  much  of  the  period.
Massachusetts  and  many  of  its municipalities experienced higher tax revenues
during the reporting period. As a result, their need to borrow was curtailed and
the  outcome  was  a  modestly  reduced  supply of securities. At the same time,
demand  for  short-term  municipal  securities  remained strong from individuals
seeking to protect wealth created by the strong economy and rising stock market.


However, seasonal supply-and-demand factors offset the effects of less issuance,
helping  to  push  tax-exempt  money  market  yields  higher in April and May as
taxpayers  sold  shares  of municipal money market funds to pay their income tax
obligations.  We  took  advantage  of  the resulting temporary yield increase by
extending  the  fund' s  average  maturity  as  much  as  practicable to lock in
prevailing high yields.

What is the fund's current strategy?

Our primary strategy has been to maintain a longer average weighted maturity for
the  fund  than  that of most other Massachusetts tax-exempt money market funds.
This  maturity  management  strategy  was  designed  to  help us lock in what we
believe are attractive yields during periods of low supply.

In addition, we took advantage of high yields during tax season in April and May
to  adjust  the  mix  of  assets  in  the  portfolio. We reduced our exposure to
Variable  Rate  Demand  Notes  (" VRDNs" ), which are short-term securities with
yields  that  are  adjusted  on  a  daily  or weekly basis. At the same time, we
increased  our  holdings of municipal notes and commercial paper, both of which,
in  our view, represented more compelling values. However, portfolio composition
is subject to change at any time.

August 15, 2000

(1 )  ANNUALIZED EFFECTIVE YIELD IS BASED UPON DIVIDENDS DECLARED DAILY AND
REINVESTED MONTHLY. PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. YIELDS
FLUCTUATE. INCOME MAY BE SUBJECT TO STATE AND LOCAL TAXES FOR NON-MASSACHUSETTS
RESIDENTS, AND SOME INCOME MAY BE SUBJECT TO THE FEDERAL ALTERNATIVE MINIMUM TAX
(AMT) FOR CERTAIN INVESTORS. AN INVESTMENT IN THE FUND IS NOT INSURED OR
GUARANTEED BY THE FDIC OR THE U.S. GOVERNMENT. 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.

                                                             The Fund

STATEMENT OF INVESTMENTS

July 31, 2000 (Unaudited)
<TABLE>

STATEMENT OF INVESTMENTS

                                                                                              Principal
TAX EXEMPT INVESTMENTS--98.6%                                                                Amount ($)               Value ($)
------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                            <C>                        <C>

Town of Attleboro, BAN 4.25%, 8/3/2000                                                        5,903,000                5,903,094

Town of Barnstable, G.O. Notes 4.25%, 3/15/2001                                               1,490,000                1,490,000

Bridgewater and Raynham Regional School District, BAN

   5%, 5/10/2001                                                                              2,645,000                2,648,117

Town of Canton Housing Authority, Multi-Family Housing

  Mortgage Revenue, Refunding, VRDN

   (Canton Arboretum Apartments) 4.30% (LOC; FNMA)                                            6,000,000  (a)           6,000,000

Town of Clinton, BAN 4%, 9/29/2000                                                            1,270,000                1,269,212

Town of Lanesborough, G.O. Notes 7%, 5/1/2001 (Insured; MBIA)                                   440,000                  447,954

Town of Lowell, BAN 4.75%, 12/20/2000                                                         2,000,000                2,001,950

Massachusetts Development Finance Agency, VRDN

  EIR (The Mead Corp. Project)

      4.35%, Series A (LOC; Bank of Austria)                                                  3,100,000  (a)           3,100,000

   IDR:

      (Ahead Headgear Inc.) 4.40% (LOC; Fleet Bank)                                           4,145,000  (a)           4,145,000

      (Draper Laboratory) 4.20% (Insured; MBIA and LOC;

         Morgan Guaranty Trust Co.)                                                           5,000,000  (a)           5,000,000

      (Elderhostel Inc.) 4.15% (LOC; Royal Bank of Scotland)                                  5,000,000  (a)           5,000,000

      (Salema Family Ltd.) 4.40%, Series A (LOC; Fleet Bank)                                  2,300,000  (a)           2,300,000

Massachusetts Health and Educational Facilities Authority:

  Revenues, Prerefunded (New England Deaconess Hospital)

    7.20%, Series C, 4/1/2001 (Escrowed in:

      U.S. Treasury Bills and U.S. Government Securities)                                     4,500,000                4,671,618

   VRDN:

      College and University Revenue:

         (Becker College) 4.25%, Series A-1
            (LOC; Fleet National Bank)                                                        4,860,000  (a)           4,860,000

         (Boston University) 4.20%, Series H
            (LOC; Landesbank Hessen)                                                         11,300,000  (a)          11,300,000

         (Havard University) 4.15%, Series I                                                  4,500,000  (a)           4,500,000

      Revenues, (Capital Asset Program):

         4%, Series A (LOC; Bank One Corp.)                                                   8,250,000  (a)           8,250,000

         4.25%, Series D (Insured; MBIA and

            LOC; State Street Bank and Trust Co.)                                             5,300,000  (a)           5,300,000

Massachusetts Housing Finance Agency:

  MFHR, VRDN, Refunding (Harbor Point)

      4.10%, Series A (LOC: GNMA and HSBC Bank)                                               4,900,000  (a)           4,900,000

   SFHR 4.90%, Series C-1, 6/1/2001
      (LOC; Transamerica Life & Insurance)                                                    1,000,000                1,000,000



                                                                                              Principal
TAX EXEMPT INVESTMENTS (CONTINUED)                                                           Amount ($)                Value ($)
------------------------------------------------------------------------------------------------------------------------------------

Massachusetts Industrial Finance Agency:

  PCR, CP:

    (New England Power Company Project)

         4.40%, Series A, 10/10/2000 (Corp. Guaranty;

            New England Power Co.)                                                            3,000,000                3,000,000

         4.10%, Series A, 10/23/2000 (Corp. Guaranty;

            New England Power Co.)                                                            5,000,000                5,000,000

         4.10%, Series A, 10/30/2000 (Corp. Guaranty;

            New England Power Co.)                                                            5,000,000                5,000,000

      Refunding 4.65%, Series B, 10/12/2000

         (Corp. Guaranty; New England Power Co.)                                              2,000,000                2,000,000

   Revenues, Prerefunded (Cape Cod Health System)
      8.50%, 11/15/2000

      (Escrowed in; U.S. Government Securities)                                               1,000,000                1,032,122

   VRDN:

      College and University Revenue:

         (Milton Academy) 4.25% (Insured; MBIA and
            Liquidity Facility; Fleet Bank)                                                   2,000,000  (a)           2,000,000

         (Newbury College) 4.25% (LOC; Fleet National Bank)                                   5,485,000  (a)           5,485,000

         (Showa Womens Institute) 4.30%
            (LOC; The Bank of New York)                                                       2,500,000  (a)           2,500,000

      Industrial Revenue:

         (Cambridge Isotope Laboratories Inc.)
            4.40% (LOC; Fleet Bank)                                                           3,340,000  (a)           3,340,000

         (Peterson American Corp. Project)
            4.50% (LOC; Bank One Corp.)                                                       1,000,000  (a)           1,000,000

      IDR (Hi-Tech Mold & Tool) 4.40% (LOC; Fleet Bank)                                       2,500,000  (a)           2,500,000

      PCR (Holyoke Water Power Co. Project)

         4% (LOC; Toronto-Dominion Bank)                                                      3,800,000  (a)           3,800,000

      Revenues:

         (Governor Dummer Academy)

            4.15% (LOC; State Street Bank and Trust Co.)                                        800,000  (a)             800,000

         (Heritage at Dartmouth)
            4.30% (LOC; Fleet National Bank)                                                  1,825,000  (a)           1,825,000

Massachusetts Water Resource Authority, Water Revenue:

  CP:

      4.05%, 9/8/2000 (LOC; Morgan Guaranty Trust Co.)                                        5,000,000                5,000,000

      4.10%, 10/11/2000 (LOC; Morgan Guaranty Trust Co.)                                      5,000,000                5,000,000

      4.35%, 10/20/2000 (LOC; Morgan Guaranty Trust Co.)                                      6,000,000                6,000,000

      4.10%, 10/23/2000 (LOC; Morgan Guaranty Trust Co.)                                      3,500,000                3,500,000

                                                                                                     The Fund

STATEMENT OF INVESTMENTS (Unaudited) (CONTINUED)

                                                                                              Principal
TAX EXEMPT INVESTMENTS (CONTINUED)                                                           Amount ($)               Value ($)
------------------------------------------------------------------------------------------------------------------------------------

Massachusetts Water Resource Authority, Water Revenue (continued):

  VRDN:

    4.15%, Series B (Insured; AMBAC and Liquidity Facility;

         Bank of Nova Scotia)                                                                11,000,000  (a)          11,000,000

      4.15%, Series B (Insured; FGIC and Liquidity Facility; FGIC)                            5,000,000  (a)           5,000,000

      Refunding 4.15%, Series D (Insured; FGIC and
         Liquidity Facility; FGIC)                                                           10,000,000  (a)          10,000,000

Medway, BAN 4.50%, 3/14/2001                                                                  3,412,400                3,417,427

Natick, BAN 4.50%, 8/4/2000                                                                   3,174,000                3,174,114

Newburyport, BAN 4.75%, 5/10/2001                                                             3,975,000                3,975,000

Northborough, BAN 4.75%, 5/18/2001                                                            1,181,876                1,184,133

City of Pittsfield, BAN 4.85%, 7/12/2001                                                      4,700,000                4,713,594

Scituate, BAN 4.25%, 3/8/2001                                                                   900,000                  897,302

Tantasqua Regional School District, BAN 5%, 8/25/2000                                         5,000,000                5,000,962

Town of Wayland, BAN 4.50%, 12/22/2000                                                        4,670,000                4,679,816

Town of Westborough, BAN 5.25%, 5/25/2001                                                     4,000,000                4,015,829

Town of Westfield, BAN 4.75%, 9/15/2000                                                       2,700,000                2,701,939

Weymouth, BAN 4.50%, 9/21/2000                                                                8,722,000                8,725,927

Whitman Hanson Regional School District,
   BAN 4.50%, 10/13/2000                                                                      4,142,000                4,145,376

Williamstown, BAN 4.50%, 9/20/2000                                                            3,000,000                3,001,483

Worcester, BAN 5%, 8/30/2000                                                                  8,000,000                8,003,266
------------------------------------------------------------------------------------------------------------------------------------

TOTAL INVESTMENTS (cost $226,502,382)                                                             98.6%              226,505,235

CASH AND RECEIVABLES (NET)                                                                         1.4%                3,156,280

NET ASSETS                                                                                       100.0%              229,661,515


Summary of Abbreviations

AMBAC                     American Municipal Bond

                             Assurance Corporation

BAN                       Bond Anticipation Notes

CP                        Commercial Paper

EIR                       Environment Improvement

                             Revenue

FGIC                      Financial Guaranty Insurance

                             Company

FNMA                      Federal National Mortgage

                             Association

GNMA                      Government National Mortgage

                             Association

GO                        General Obligation

IDR                       Industrial Development

                             Revenue

LOC                       Letter of Credit

MBIA                      Municipal Bond Investors

                             Assurance Insurance

                             Corporation

MFHR                      Multi-Family Housing Revenue

PCR                       Pollution Control Revenue

SFHR                      Single Family Housing Revenue

VRDN                      Variable Rate Demand Notes

Summary of Combined Ratings (Unaudited)

Fitch                or          Moody's               or        Standard & Poor's                           Value (%)
------------------------------------------------------------------------------------------------------------------------------------

F1+/F1                           VMIG1/MIG1, P1                  SP1+/SP1, A1+/A1                                 70.7

AAA/AA (b)                       Aaa/Aa (b)                      AAA/AA (b)                                        7.5

Not Rated (c)                    Not Rated (c)                   Not Rated (c)                                    21.8

                                                                                                                 100.0

(A)  SECURITIES PAYABLE ON DEMAND. VARIABLE INTEREST RATE--SUBJECT TO PERIODIC
     CHANGES.

(B)  NOTES WHICH ARE NOT F, MIG OR SP RATED ARE REPRESENTED BY BOND RATINGS OF
     THE ISSUERS.

(C)  SECURITIES WHICH, WHILE NOT RATED BY FITCH, MOODY'S AND STANDARD & POOR'S
     HAVE BEEN DETERMINED BY THE MANAGER TO BE OF COMPARABLE QUALITY TO THOSE
     RATED SECURITIES IN WHICH THE FUND MAY INVEST.

(D)  AT JULY 31, 2000, THE FUND HAD $71,396,495 (31.1% OF NET ASSETS) INVESTED
     IN SECURITIES WHOSE PAYMENT OF PRINCIPAL AND INTEREST IS DEPENDENT UPON
     REVENUES GENERATED FROM CITY-MUNICIPAL PROJECTS.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

                                                             The Fund

STATEMENT OF ASSETS AND LIABILITIES

July 31, 2000 (Unaudited)

                                                             Cost         Value
--------------------------------------------------------------------------------

ASSETS ($):

Investments in securities--See Statement of
Investments                                           226,502,382   226,505,235

Cash                                                                  1,406,042

Interest receivable                                                   1,877,240

Prepaid expenses and other assets                                         6,024

                                                                    229,794,541
--------------------------------------------------------------------------------

LIABILITIES ($):

Due to The Dreyfus Corporation and affiliates                            97,417

Accrued expenses and other liabilities                                   35,609

                                                                        133,026
--------------------------------------------------------------------------------

NET ASSETS ($)                                                      229,661,515
--------------------------------------------------------------------------------

COMPOSITION OF NET ASSETS ($):

Paid-in capital                                                     229,693,553

Accumulated net realized gain (loss) on investments                    (34,891)

Accumulated gross unrealized appreciation of investments                  2,853
--------------------------------------------------------------------------------

NET ASSETS ($)                                                      229,661,515
--------------------------------------------------------------------------------

SHARES OUTSTANDING

(unlimited number of $.001 par value shares of Beneficial Interest authorized)
229,708,449

NET ASSET VALUE, offering and redemption price per share ($)               1.00

SEE NOTES TO FINANCIAL STATEMENTS.


STATEMENT OF OPERATIONS

Six Months Ended July 31, 2000 (Unaudited)

--------------------------------------------------------------------------------

INVESTMENT INCOME ($):

INTEREST INCOME                                                      4,388,148

EXPENSES:

Management fee--Note 2(a)                                              549,498

Shareholder servicing costs--Note 2(b)                                  69,849

Custodian fees                                                          11,231

Registration fees                                                       11,155

Prospectus and shareholders' reports                                     4,909

Trustees' fees and expenses--Note 2(c)                                   4,107

Miscellaneous                                                            1,373

TOTAL EXPENSES                                                         652,122

INVESTMENT INCOME--NET                                               3,736,026
--------------------------------------------------------------------------------

NET UNREALIZED APPRECIATION (DEPRECIATION) ON INVESTMENTS--NOTE 1(B)($)  2,853

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                 3,738,879

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

STATEMENT OF CHANGES IN NET ASSETS

                                         Six Months Ended
                                            July 31, 2000        Year Ended
                                              (Unaudited)  January 31, 2000
-------------------------------------------------------------------------------

OPERATIONS ($):

Investment income--net                          3,736,026           4,907,759

Net realized gain (loss) from investments              --                 (29)

Net unrealized appreciation (depreciation)
    of investments                                 2,853                   --

NET INCREASE (DECREASE) IN NET ASSETS
   RESULTING FROM OPERATIONS                    3,738,879            4,907,730
--------------------------------------------------------------------------------

DIVIDENDS TO SHAREHOLDERS FROM ($):

INVESTMENT INCOME--NET                        (3,736,026)          (4,907,759)
--------------------------------------------------------------------------------

BENEFICIAL INTEREST TRANSACTIONS ($1.00 per share):

Net proceeds from shares sold                 264,165,059         407,399,301

Dividends reinvested                            2,341,806           3,040,795

Cost of shares redeemed                     (237,596,490)        (414,975,495)

INCREASE (DECREASE) IN NET ASSETS
   FROM BENEFICIAL INTEREST TRANSACTIONS      28,910,375           (4,535,399)

TOTAL INCREASE (DECREASE) IN NET ASSETS       28,913,228           (4,535,428)
--------------------------------------------------------------------------------

NET ASSETS ($):

Beginning of Period                           200,748,287          205,283,715

END OF PERIOD                                 229,661,515          200,748,287

SEE NOTES TO FINANCIAL STATEMENTS


FINANCIAL HIGHLIGHTS

The  following table describes the performance for the fiscal periods indicated.
Total return shows how much your investment in the fund would have increased (or
decreased)  during  each  period,  assuming you had reinvested all dividends and
distributions.  These  figures  have  been  derived  from  the  fund's financial
statements.
<TABLE>

                                          Six Months Ended
                                             July 31, 2000                                 Year Ended January 31,
                                                                   -----------------------------------------------------------------
                                                (Unaudited)         2000         1999          1998           1997          1996
------------------------------------------------------------------------------------------------------------------------------------
<S>                                                  <C>            <C>          <C>           <C>             <C>           <C>

PER SHARE DATA ($):

Net asset value, beginning of period                  1.00          1.00         1.00          1.00           1.00          1.00

Investment Operations:

Investment income--net                                .017          .026         .028          .030           .028          .033

Distributions:

Dividends from investment
   income-net                                       (.017)        (.026)        (.028)         (.030)        (.028)        (.033)

Net asset value, end of period                        1.00         1.00          1.00           1.00          1.00          1.00
------------------------------------------------------------------------------------------------------------------------------------

TOTAL RETURN (%)                                   3.41(a)         2.64          2.79           3.01          2.86          3.34
------------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to average
   net assets                                       .59(a)          .63           .64            .63           .60          .46

Ratio of net investment income
   to average net assets                           3.39(a)         2.60          2.75           2.97          2.82         3.28

Decrease reflected in above
   expense ratios due to
   undertakings by The
   Dreyfus Corporation                                  --          --            --            .01            .06          .19
-----------------------------------------------------------------------------------------------------------------------------------

Net Assets, end of period
   ($ x 1,000)                                     229,662      200,748       205,284       179,663        191,996      155,055

(A) ANNUALIZED.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

                                                             The Fund

NOTES TO FINANCIAL STATEMENTS (Unaudited)

NOTE 1--Significant Accounting Policies:

Dreyfus  Massachusetts  Municipal  Money  Market Fund (the "fund") is registered
under  the  Investment  Company  Act  of  1940,  as  amended  (the  "Act"), as a
non-diversified  open-end  management  investment company. The fund's investment
objective  is to provide investors with as high a level of current income exempt
from   Federal  and  Massachusetts  income  taxes  as  is  consistent  with  the
preservation   of   capital  and  the  maintenance  of  liquidity.  The  Dreyfus
Corporation (the "Manager") serves as the fund's investment adviser. The Manager
is  a  direct subsidiary of Mellon Bank, N.A, which is a wholly-owned subsidiary
of  Mellon  Financial  Corporation.  Effective  March  22, 2000, Dreyfus Service
Corporation   ("DSC" ), a  wholly-owned  subsidiary  of  Manager,  became  the
distributor  of  the fund's shares, which are sold to the public without a sales
charge.  Prior  to  March  22,  2000, Premier Mutual Fund Services, Inc. was the
distributor.

It  is  the  fund's policy to maintain a continuous net asset value per share of
$1.00; the fund has adopted certain investment, portfolio valuation and dividend
and distribution policies to enable it to do so. There is no assurance, however,
that  the  fund  will  be able to maintain a stable net asset value per share of
$1.00.

The  fund' s  financial  statements  are  prepared  in accordance with generally
accepted accounting principles which may require the use of management estimates
and assumptions. Actual results could differ from those estimates.

(a) Portfolio valuation: Investments in securities are valued at amortized cost,
which  has been determined by the fund's Board of Trustees to represent the fair
value of the fund's investments.

(b)  Securities  transactions and investment income: Securities transactions are
recorded  on  a  trade date basis. Interest income, adjusted for amortization of
premiums  and original issue discounts on investments, is earned from settlement
date and recognized on the accrual basis. Realized gain and loss from securities
transactions  are  recorded  on  the  identified cost basis. Cost of investments
represents    amortized    cost.

Under the terms of the custody agreement, the fund received net earnings credits
of $6,777 during the period ended July 31, 2000 based on available cash balances
left  on  deposit.  Income earned under this arrangement is included in interest
income.

The  fund  follows  an  investment  policy  of  investing primarily in municipal
obligations  of  one  state. Economic changes affecting the state and certain of
its  public  bodies  and municipalities may affect the ability of issuers within
the  state to pay interest on, or repay principal of, municipal obligations held
by the fund.

(c) Dividends to shareholders: It is the policy of the fund to declare dividends
daily  from  investment  income-net.  Such dividends are paid monthly. Dividends
from  net  realized  capital  gain,  if  any,   are  normally  declared and paid
annually, but the fund may make distributions on a more frequent basis to comply
with  the  distribution  requirements  of  the Internal Revenue Code of 1986, as
amended (the "Code"). To the extent that net realized capital gain can be offset
by  capital loss carryovers, it is the policy of the fund not to distribute such
gain.

(d) Federal income taxes: It is the policy of the fund to continue to qualify as
a  regulated  investment  company, which can distribute tax exempt dividends, by
complying  with the applicable provisions of the Code, and to make distributions
of  income  and  net  realized  capital  gain  sufficient  to  relieve  it  from
substantially all Federal income and excise taxes.

The fund has an unused capital loss carryover of approximately $34,900 available
for  Federal  income  tax  purposes  to be applied against future net securities
profits,  if  any,  realized  subsequent  to  January  31, 2000. If not applied,
$30,500  of the carryover expires in fiscal 2003, $1,000 expires in fiscal 2004,
$300  expires  in fiscal 2005, $2,700 expires in fiscal 2006 and $400 expires in
fiscal 2007.

At  July  31,  2000, the cost of investments for Federal income tax purposes was
substantially  the  same  as  the cost for financial reporting purposes (see the
Statement of Investments).

                                                             The Fund

NOTES TO FINANCIAL STATEMENTS (Unaudited) (CONTINUED)

NOTE 2--Management Fee and Other Transactions with Affiliates:

(a)  Pursuant  to a management agreement with the Manager, the management fee is
computed  at  the  annual  rate  of .50 of 1% of the value of the fund's average
daily net assets and is payable monthly.

(b)  Under the Shareholder Services Plan, the fund reimburses the distributor an
amount  not  to  exceed  an  annual rate of .25 of 1% of the value of the fund's
average  daily  net  assets for certain allocated expenses of providing personal
services  and/or  maintaining  shareholder  accounts.  The services provided may
include  personal  services  relating to shareholder accounts, such as answering
shareholder  inquiries  regarding  the  fund  and  providing  reports  and other
information,  and  services  related to the maintenance of shareholder accounts.
During  the period ended July 31, 2000, the fund was charged $41,808 pursuant to
the Shareholder Services Plan.

The  fund  compensates  Dreyfus Transfer, Inc., a wholly-owned subsidiary of the
Manager,   under  a  transfer  agency  agreement  for  providing  personnel  and
facilities  to  perform  transfer agency service for the fund. During the period
ended  July  31,  2000,  the  fund  was charged $16,386 pursuant to the transfer
agency agreement.

(c)  Each  trustee  who  is  not  an  "affiliated  person" as defined in the Act
receives  from  the  fund  an  annual  fee  of $1,000. The Chairman of the Board
receives an additional 25% of such compensation.


                                                           For More Information

                        Dreyfus Massachusetts Municipal
                        Money Market Fund
                        200 Park Avenue
                        New York, NY 10166

                          Manager

                        The Dreyfus Corporation
                        200 Park Avenue
                        New York, NY 10166

                          Custodian

                        The Bank of New York
                        100 Church Street
                        New York, NY 10286

                          Transfer Agent &
                          Dividend Disbursing Agent

                        Dreyfus Transfer, Inc.
                        P.O. Box 9671
                        Providence, RI 02940

                          Distributor

                        Dreyfus Service Corporation
                        200 Park Avenue
                        New York, NY 10166

To obtain information:

BY TELEPHONE
Call 1-800-645-6561

BY MAIL  Write to:
The Dreyfus Family of Funds
144 Glenn Curtiss Boulevard
Uniondale, NY 11556-0144

BY E-MAIL  Send your request
to [email protected]

ON THE INTERNET  Information can be viewed online or downloaded from:

http://www.dreyfus.com

(c) 2000 Dreyfus Service Corporation                                   639SA007




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