DREYFUS MASSACHUSETTS MUNICIPAL MONEY MARKET FUND
N-30D, 2000-03-31
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Dreyfus
Massachusetts
Municipal Money
Market Fund

ANNUAL REPORT January 31, 2000

(reg.tm)

<PAGE>

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

Year 2000 Issues (Unaudited)

The fund could be adversely affected if the computer systems used by Dreyfus and
the fund's other service providers do not properly process and calculate
date-related information from and after January 1, 2000. Dreyfus has taken steps
designed to avoid year 2000-related problems in its systems and to monitor the
readiness  of other service providers.  In addition, issuers of securities in
which the fund invests may be adversely affected by year 2000-related problems.
This could have an impact on the value of the fund's investments and its share
price.



<PAGE>

                                 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

                            17   Report of Independent Auditors

                            18   Important Tax Information

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

                                 Back Cover

<PAGE>


                                                                       The Fund

                                               Dreyfus  Massachusetts Municipal

                                                              Money Market Fund

LETTER FROM THE PRESIDENT

Dear Shareholder:

We are pleased to present this annual report for Dreyfus Massachusetts Municipal
Money  Market  Fund,  covering the 12-month period from February 1, 1999 through
January  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.

When  the  reporting  period  began,  it  became apparent that international and
domestic  economies  were  growing faster than analysts expected, giving rise to
concerns  that  long-dormant  inflationary  pressures might re-emerge. Consumers
continued  to  spend heavily, unemployment levels reached new lows and the stock
market  continued  to  climb. Due to the fact that unsustainable economic growth
may  trigger  unwanted  inflationary pressures, the Federal Reserve Board raised
key  short-term  interest  rates  three times between June 30 and the end of the
reporting  period  in  an  attempt  to forestall an acceleration of inflation. A
fourth rate hike was announced just a few days after the reporting period ended.
These  influences  contributed  to  higher  yields  for  tax-exempt money market
securities.

We  appreciate  your  confidence over the past year, 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

February 15, 2000





<PAGE>

DISCUSSION OF FUND PERFORMANCE

Scott Sprauer, Portfolio Manager

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

For  the  12-month period ended January 31, 2000, the fund achieved a tax-exempt
yield  of  2.61% . Taking  into  account  the  effects  of compounding, the fund
achieved    an    effective    yield    of    2.64%   .(1)

What is the fund's investment approach?

The  fund' s  objective  is  to  seek  a  high  level  of  federal  and state of
Massachusetts tax-exempt income while maintaining a stable $1.00 share price. We
are    especially    vigilant    in   our   efforts   to   preserve   capital.

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 are generally issued with
maturities  in  the  one-year  range,  and  tend to lengthen the fund's weighted
average  maturity.  If we anticipate limited new-issue supply, we may extend the
fund' 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?

Soon  after  the reporting period began, it became apparent that economic growth
was    greater    than    most    investors    had    anticipated.    The   Fun



<PAGE>

DISCUSSION OF FUND PERFORMANCE (CONTINUED)

Evidence  emerged  that  economies  in  Japan  and  Southeast  Asia had begun to
recover,  and  the  growth of the U.S. economy was robust. In the United States,
consumer confidence was at a 30-year high and employment was strong, with hourly
wages rising.

This  positive  economic  news raised concerns among fixed-income investors that
inflationary  pressures  might re-emerge. In response, the Federal Reserve Board
increased  short-term  interest  rates three times during the summer and fall of
1999.  An  additional  rate hike occurred just after the reporting period ended,
for a total increase of 100 basis points from February 1, 1999, the start of the
reporting  period,  through  February  15,  2000,  the  date  of  this  report.

Although  these  interest-rate  increases caused short-term tax-exempt yields to
rise  throughout  the  reporting  period, tax-exempt money market yields did not
rise  as  much  as  comparable taxable yields during much of the year, primarily
because  many  states and municipalities enjoyed higher tax revenues during this
period of economic prosperity. As a result, many municipalities had less need to
borrow   to   satisfy   their   short-term   obligations.   Subsequently,   when
municipalities  issued  more  short-term  tax-exempt securities, rates rose more
substantially.

What is the fund's current strategy?

We  have  continued  to  manage  the  fund' s  average maturity according to our
supply-and-demand  expectations.  Accordingly,  we  modestly extended the fund's
average  maturity  last  summer  to maintain competitive yields during a time of
little  new  issuance.  We  later allowed the fund's average maturity to decline
naturally  as  existing  holdings  matured, enabling us to capture higher yields
during  the  fourth  quarter of 1999, when issuance increased. We again modestly
extended  the  average maturity at year-end to take advantage of market weakness
in  advance  of  potential  Y2K  concerns, which ultimately proved unfounded. We
ended  the  reporting  period with a weighted average maturity that was slightly
longer  than  neutral. This position was designed to maintain competitive yields
through    February,    typically    a    low-issuance    month.


<PAGE>


Our  security selection strategy continued to focus on very high quality, liquid
money  market  instruments  from  an array of Massachusetts issuers. Some of the
instruments used included tax-exempt commercial paper, which offered high levels
of  liquidity,  strong credit characteristics and competitive yields for much of
the  year.  After  the  Federal Reserve Board raised interest rates in November,
however,  we  used  the  proceeds from maturing commercial paper to increase our
holdings  of municipal notes and Variable Rate Demand Notes (VRDNs), high credit
quality  securities that afforded the fund a high degree of liquidity in advance
of  buying  opportunities  at  year-end.  Of  course, portfolio composition will
change over time.

February 15, 2000

(1)  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 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.

                                                             The Fund

<PAGE>


STATEMENT OF INVESTMENTS

January 31, 2000

STATEMENT OF INVESTMENTS (CONTINUED)

<TABLE>
<CAPTION>


                                                                                             Principal
TAX EXEMPT INVESTMENTS--99.0%                                                               Amount ($)                Value ($)
- ------------------------------------------------------------------------------------------------------------------------------------

<S>                                      >                                                    <C>                      <C>
Town of Amesbury, GO Notes 4.25%, 3/15/2000                                                   1,000,000                1,000,333

Town of Attleboro, BAN 4.25%, 8/3/2000                                                        5,903,000                5,911,689

City of Boston Water and Sewer Commission, Revenue, VRDN

   3.05%, Series A (LOC; State Street Bank and Trust Co.)                                     2,650,000  (a)           2,650,000

Town of Canton Housing Authority, Multi-Family Housing
   Mortgage Revenue, Refunding, VRDN
   (Canton Arboretum Apartments) 3.40% (LOC; FNMA)                                            6,000,000  (a)           6,000,000

Town of Foxborough, BAN 3.50%, 6/21/2000                                                      4,495,000                4,500,535

Town of Framingham, BAN 4.25%, 3/9/2000                                                       2,500,000                2,500,878

Town of Hanover, BAN 4.25%, 5/30/2000                                                         1,000,000                1,001,059

Town of Mansfield, BAN 4.25%, 4/26/2000                                                       4,000,000                4,003,190

Town of Masconomet Regional School District, BAN

   3.50%, 6/2/2000                                                                            1,122,000                1,122,093

Massachusetts Bay Transportation Authority:

  CP:

      3.75%, Series A, 2/18/2000
         (LOC; State Street Bank and Trust Co.)                                               4,000,000                4,000,000

         (Massachusetts Bridge) 3.80%, 3/13/2000
         (LOC; State Street Bank and Trust Co.)                                               1,000,000                1,000,000

   Revenue, Massachusetts General Transportation System,
      4.50%, Series C, 3/1/2000                                                               2,000,000                2,002,039

Massachusetts Development Finance Agency, VRDN,

  Revenue:

      (Dean College) 3.15% (LOC; Fleet Bank)                                                  2,500,000  (a)           2,500,000

      (Elderhostel Inc.) 3.10% (LOC; Royal Bank of Scotland)                                  5,000,000  (a)           5,000,000

Massachusetts Health and Education Facilities Authority:
   Revenue:

      Refunding (Baystate Medical Center)
         4.375%, Series D, 7/1/2000 (Insured; FGIC)                                           2,000,000                2,006,611

      (University of Massachusetts) 4%, Series A, 7/1/2000
         (Insured; AMBAC)                                                                     1,225,000                1,227,215

   VRDN:

      (Becker College) 3.25% Series A
         (LOC; Fleet National Bank)                                                           1,000,000  (a)           1,000,000

      (Boston University) 4.75% Series H
         (LOC; Landesbank Hessen)                                                             9,000,000  (a)           9,000,000

      (Capital Asset Program):

         3.15%, Series A (LOC; Bank One Corp.)                                                8,250,000  (a)           8,250,000

         3.55%, Series C (Insured; MBIA and Liquidity;
            State Street Bank and Trust Co.)                                                  8,000,000  (a)           8,000,000

         3.55%, Series E (LOC; Bank One Corp.)                                                6,100,000  (a)           6,100,000

<PAGE>


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

Massachusetts Health and Education Facilities Authority, VRDN
  (continued):

    (Capital Asset Program) (continued):


         3.60%, Series D (Insured; MBIA and Liquidity Facility;
            State Street Bank and Trust Co.)                                                  7,000,000  (a)           7,000,000

      (Hallmark Health Systems) 3.10%, Series B
         (Insured; FSA and Liquidity; Fleet Bank)                                             5,800,000  (a)           5,800,000

      (Harvard University) 2.95%, Series L (Guaranteed by;
         Harvard University)                                                                 10,000,000  (a)          10,000,000

      (Partners Healthcare Systems)

         3.05%, Series P-1 (Insured; FSA and Liquidity:
         Bayerische Landesbank and Morgan
         Guaranty Trust Co.)                                                                  8,400,000  (a)           8,400,000

      (Wellesley College) 3.45%, Series G
         (LOC; Wellesley College)                                                             1,100,000  (a)           1,100,000


Massachusetts Housing Finance Agency, Multi-Family, VRDN,


   Refunding (Harbor Point) 3.20%, Series A
   (LOC; GNMA and Republic National Bank)                                                     5,000,000  (a)           5,000,000


Massachusetts Industrial Finance Agency:

  CP, PCR, Refunding (New England Power Company Project)


      3.75%, Series B, 2/29/2000 (LOC; New England Power Co.)                                 2,000,000                2,000,000

   Industrial Revenue, VRDN,

      (Cambridge Isotope Labs Inc.) 3.35% (LOC; Fleet Bank)                                   3,485,000  (a)           3,485,000

   PCR (Holyoke Water Power Co. Project), VRDN,

      3.15% (LOC; Toronto-Dominion Bank)                                                      3,800,000  (a)           3,800,000

   Revenue, VRDN:

      (Governor Dummer Academy) 3.10%
         (LOC; State Street Bank and Trust Co.)                                                 800,000  (a)             800,000

      (Heritage at Dartmouth) 3.20% (LOC; Fleet National Bank)                                1,825,000  (a)           1,825,000

      (Milton Academy) 3.25%
         (Insured; MBIA and Liquidity; Fleet Bank)                                            1,500,000  (a)           1,500,000

      (Newbury College) 3.25% (LOC; Fleet National Bank)                                      5,585,000  (a)           5,585,000

      Refunding (Showa Womens Institute)
         3.60% (LOC; The Bank of New York)                                                    3,900,000  (a)           3,900,000


Massachusetts Water Resource Authority:

  Multi-Modal, VRDN:

    3.05%, Series B (Insured; AMBAC and Liquidity;|


         Bank of Nova Scotia)                                                                11,100,000  (a)          11,100,000

      Refunding, 3.05%, Series D
         (Insured; FGIC and Liquidity; FGIC)                                                 10,000,000  (a)          10,000,000

   Prerefunding 6%, Series A 4/1/2000                                                         4,500,000                4,515,464

                                                                                                     The Fund

<PAGE>



STATEMENT OF INVESTMENTS (CONTINUED)

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

Natick, BAN 4.50%, 8/4/2000                                                                   3,174,000                3,181,046

Northhampton, BAN 4%, 6/29/2000                                                               4,000,000                4,007,539

Town of Pittsfield, BAN:


   4%, 7/12/2000                                                                              4,500,000                4,501,920

   4.20%, 7/12/2000                                                                           6,000,000                6,005,119

Town of Taunton, GO Notes 4.25%, 5/1/2000                                                     2,090,000                2,095,517

Town of Tisbury, BAN 4.25%, 6/15/2000                                                         2,820,500                2,823,527

Town of Waltham, BAN 4.25%, 4/28/2000                                                         4,290,000                4,293,622

Town of Wayland, BAN 4.50%, 12/22/2000                                                        4,670,000                4,692,310

Town of Westfield, BAN 4.25%, 4/20/2000                                                       2,500,000                2,502,379
- ------------------------------------------------------------------------------------------------------------------------------------

TOTAL INVESTMENTS (cost $198,689,085)                                                             99.0%              198,689,085

CASH AND RECEIVABLES (NET)                                                                         1.0%                2,059,202

NET ASSETS                                                                                       100.0%              200,748,287
</TABLE>




<PAGE>

<TABLE>
<CAPTION>

Summary of Abbreviations


<S>                 <C>                                           <C>              <C>
AMBAC               American Municipal Bond                       GO                General Obligation

                        Assurance Corporation                     GNMA              Government National Mortgage

BAN                 Bond Anticipation Notes                                             Association

CP                  Commercial Paper                              LOC               Letter of Credit

FGIC                Financial Guaranty Insurance                  MBIA              Municipal Bond Investors Assurance

                        Company                                                         Insurance Corporation

FNMA                Federal National Mortgage                     PCR               Pollution Control Revenue

                        Association                               VRDN              Variable Rate Demand Notes

FSA                 Financial Security Assurance
</TABLE>



Summary of Combined Ratings (Unaudited)

<TABLE>
<CAPTION>

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

<S>                              <C>                             <C>                                             <C>
F1+/F1                           VMIG1/MIG1, P1                  SP1+/SP1, A1+/A1                                 65.8

AAA/AA (b)                       Aaa/Aa (b)                      AAA/AA (b)                                        9.3

Not Rated (c)                    Not Rated (c)                   Not Rated (c)                                    24.9

                                                                                                                 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.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>


                                                             The Fund

<PAGE>


STATEMENT OF ASSETS AND LIABILITIES

January 31, 2000

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

ASSETS ($):

Investments in securities--See Statement of
Investments                                           198,689,085    198,689,085

Cash                                                                    959,248

Interest receivable                                                   1,224,799

Prepaid expenses and other assets                                        10,636


                                                                    200,883,768
- --------------------------------------------------------------------------------


LIABILITIES ($):

Due to The Dreyfus Corporation and affiliates                            82,205

Accrued expenses                                                         53,276


                                                                        135,481
- --------------------------------------------------------------------------------

NET ASSETS ($)                                                      200,748,287
- --------------------------------------------------------------------------------


COMPOSITION OF NET ASSETS ($):

Paid-in capital                                                     200,783,178

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

NET ASSETS ($)                                                      200,748,287
- --------------------------------------------------------------------------------

SHARES OUTSTANDING

(unlimited number of $.001 par value shares of
Beneficial Interest authorized)                                     200,798,074

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

SEE NOTES TO FINANCIAL STATEMENTS.


<PAGE>


STATEMENT OF OPERATIONS

Year Ended January 31, 2000

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

INVESTMENT INCOME ($):

INTEREST INCOME                                                      6,103,266

EXPENSES:

Management fee--Note 2(a)                                              943,227

Shareholder servicing costs--Note 2(b)                                 140,460

Professional fees                                                       44,841

Custodian fees                                                          22,357


Registration fees                                                      16,283

Prospectus and shareholders' reports                                   13,373

Trustees' fees and expenses--Note 2(c)                                  7,224

Miscellaneous                                                           7,742

TOTAL EXPENSES                                                      1,195,507

INVESTMENT INCOME--NET                                              4,907,759
- --------------------------------------------------------------------------------

NET REALIZED GAIN (LOSS) ON INVESTMENTS--NOTE 1(B) ($):                  (29)

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                4,907,730


SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

<PAGE>


STATEMENT OF CHANGES IN NET ASSETS

                                                        Year Ended January 31,
                                                    ----------------------------

                                                     2000                1999
- --------------------------------------------------------------------------------

OPERATIONS ($):

Investment income--net                          4,907,759            5,417,443

Net realized gain (loss) on investments              (29)                (398)

NET INCREASE (DECREASE) IN NET ASSETS


   RESULTING FROM OPERATIONS                    4,907,730            5,417,045
- --------------------------------------------------------------------------------


DIVIDENDS TO SHAREHOLDERS FROM ($):

INVESTMENT INCOME--NET                        (4,907,759)          (5,417,443)
- --------------------------------------------------------------------------------

BENEFICIAL INTEREST TRANSACTIONS ($1.00 per share):

Net proceeds from shares sold                 407,399,301         427,639,049

Dividends reinvested                            3,040,795           3,305,496

Cost of shares redeemed                     (414,975,495)        (405,323,494)

INCREASE (DECREASE) IN NET ASSETS


   FROM BENEFICIAL INTEREST TRANSACTIONS     (4,535,399)           25,621,051

TOTAL INCREASE (DECREASE) IN NET ASSETS      (4,535,428)           25,620,653
- --------------------------------------------------------------------------------


NET ASSETS ($):

Beginning of period                           205,283,715          179,663,062

END OF PERIOD                                 200,748,287          205,283,715

SEE NOTES TO FINANCIAL STATEMENTS.


<PAGE>


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>
<CAPTION>


                                                                                           Year Ended January 31,
                                                                 -------------------------------------------------------------------


                                                                 2000          1999           1998           1997           1996
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                              <C>           <C>            <C>            <C>            <C>
PER SHARE DATA ($):

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


Investment Operations:


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


Distributions:


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

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

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


RATIOS/SUPPLEMENTAL DATA (%):


Ratio of expenses to average net assets                           .63           .64            .63            .60             .46


Ratio of net investment income


   to average net assets                                         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)                         200,748       205,284         179,663       191,996         155,055


SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>


                                                             The Fund

<PAGE>


NOTES TO FINANCIAL STATEMENTS

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.  Premier  Mutual  Fund Services, Inc. is the
distributor  of  the fund's shares, which are sold to the public without a sales
charge.

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

<PAGE>


earnings  credits  of  $7,783  during the period ended January 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 January 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

<PAGE>


NOTES TO FINANCIAL STATEMENTS (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 Dreyfus Service
Corporation,  a  wholly-owned subsidiary of the Manager, 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
January  31,  2000,  the  fund  was  charged $84,354 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  January  31,  2000, the fund was charged $34,833 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.

NOTE 3--Subsequent Event:

At a meeting of the fund's Board of Trustees held on January 19, 2000, the Board
approved  the  termination  of  the  fund' s Distribution Agreement with Premier
Mutual  Fund  Services  Inc.,  and  approved  a  new Distribution Agreement with
Dreyfus Service Corporation. The new Distribution Agreement with Dreyfus Service
Corporation is slated for effectiveness on March 16, 2000.


<PAGE>


REPORT OF INDEPENDENT AUDITORS

Shareholders and Board of Trustees

Dreyfus Massachusetts Municipal Money Market Fund

We  have audited the accompanying statement of assets and liabilities of Dreyfus
Massachusetts   Municipal   Money   Market  Fund,  including  the  statement  of
investments,  as of January 31, 2000 and the related statement of operations for
the  year then ended, the statement of changes in net assets for each of the two
years  in  the period then ended, and financial highlights for each of the years
indicated  therein.  These financial statements and financial highlights are the
responsibility  of  the  Fund' s management. Our responsibility is to express an
opinion  on  these  financial  statements  and financial highlights based on our
audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States. 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 and the financial highlights. Our procedures included
confirmation  of  securities owned as of January 31, 2000 by correspondence with
the  custodian.  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
Dreyfus  Massachusetts  Municipal  Money  Market  Fund  at January 31, 2000, 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 the financial highlights
for  each  of  the  indicated  years,  in  conformity with accounting principles
generally accepted in the United States.


New York, New York

March 3, 2000

                                                              The Fund



<PAGE>

IMPORTANT TAX INFORMATION (Unaudited)

In accordance with Federal tax law, the fund hereby designates all the dividends
paid from investment income-net during the fiscal year ended January 31, 2000 as
"exempt-interest dividends" (not subject to regular Federal and, for individuals
who are Massachusetts residents, Massachusetts personal income taxes).


<PAGE>


NOTES

<PAGE>


                                                           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                                   639AR001



<PAGE>




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