DREYFUS MUNICIPAL MONEY MARKET FUND INC
N-30D, 2000-01-27
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Dreyfus

Municipal Money

Market Fund, Inc.

SEMIANNUAL REPORT November 30, 1999

(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

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.


                                 Contents

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

                             2   Letter from the President

                             3   Discussion of Fund Performance

                             6   Statement of Investments

                            13   Statement of Assets and Liabilities

                            14   Statement of Operations

                            15   Statement of Changes in Net Assets

                            16   Financial Highlights

                            17   Notes to Financial Statements

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

                                 Back Cover

                                                                       The Fund

                                                              Dreyfus Municipal

                                                        Money Market Fund, Inc.

LETTER FROM THE PRESIDENT

Dear Shareholder:

We  are  pleased  to  present this semiannual report for Dreyfus Municipal Money
Market  Fund,  Inc.,  covering  the  six-month  period from June 1, 1999 through
November  30,  1999. 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, Colleen Meehan.

When  the  reporting period began, investors were concerned that strong economic
growth  in  the  United States might rekindle dormant inflationary pressures. In
response, the Federal Reserve Board raised short-term interest rates three times
during  the  summer  and  fall  of  1999  in an attempt to forestall a potential
resurgence of inflation. These increases effectively reversed all of last fall's
interest-rate  cuts,  and  led to higher yields on most money market securities,
including tax-exempt instruments.

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

Sincerely,


Stephen E. Canter

President and Chief Investment Officer

The Dreyfus Corporation

December 15, 1999




DISCUSSION OF FUND PERFORMANCE

Colleen Meehan, Portfolio Manager

How did Dreyfus Municipal Money Market Fund, Inc.  perform during the period?

For  the  six-month  period  ended  November  30,  1999,  the  fund  produced an
annualized  tax-exempt  yield  of  2.74% . Taking  into  account  the effects of
compounding, the fund's annualized effective yield was 2.77%.(1)

What is the fund's investment approach?

The  fund' s  objective  is  to seek a high level of federally 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. Second, we actively manage the fund's average maturity
in  anticipation  of  interest-rate  trends and supply-and-demand changes in the
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 of new issue
supply competing for investor interest. New securities are generally issued with
maturities  in  the  one-year  range, which tend to lengthen the fund's weighted
average  maturity.  If we 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.

                                                             The Fund


DISCUSSION OF FUND PERFORMANCE (CONTINUED)

What other factors influenced the fund's performance?

The  fund  was  positively  affected  by rising interest rates over the past six
months. When the reporting period began, it had already become apparent that the
U.S.  economy  was  growing  more  strongly than most analysts expected, raising
concerns that inflationary pressures might re-emerge. In an attempt to forestall
a  reacceleration  of  inflation, the Federal Reserve Board increased short-term
interest  rates  three  times  during  the  summer and fall of 1999. Because the
market anticipated these rate hikes before they were announced, much of the rise
of  tax-exempt  money market yields had already taken place by the time the last
monetary policy change was actually implemented in November.

However,  tax-exempt  money  market  yields  did  not rise as much as comparable
taxable  yields,  primarily  because  of  a  relative lack of supply amid steady
investor  demand.  Many  states  and  municipalities throughout the country have
enjoyed higher tax revenues during this period of economic prosperity, which has
enabled them to decrease their annual debt borrowings.

What is the fund's current strategy?

We have continued to focus on very high quality, liquid money market instruments
from  a  wide  array  of  issuers.  Some of the most frequently used instruments
include Variable Rate Demand Notes (VRDNs), which are issued by investment banks
through  the securitization of longer term municipal bonds. Because VRDNs can be
redeemed  at  the buyer's option after either one day or seven days, they afford
the fund a high degree of liquidity as well as high credit quality. Accordingly,
as of November 30, much of the portfolio was composed of VRDNs. The remainder of
the  portfolio  was  comprised  primarily  of  tax-exempt  commercial  paper and
tax-exempt notes. Of course, the portfolio's composition will change over time.

We  took  advantage  of new issuance of tax-exempt notes in June and July, which
effectively enabled us to lock in prevailing yields.  The addition of notes also
extended    the    fund'   s    average    maturity    to    the    long

end  of  the neutral range, giving us the ability to maintain competitive yields
during  the  rest  of  the  summer,  which  is usually a period of low issuance.
Accordingly,  since  July,  new  purchases  have  been  concentrated  mostly  in
short-term commercial paper, which we have used to replace notes that matured or
were  redeemed  by  their  issuers.   This  strategy  has  resulted in a gradual
decrease in the fund's average maturity, which gave us the flexibility we needed
to  purchase  higher  yielding  securities that became available during the last
quarter    of    the    year.

As the end of the year approaches, we have maintained a neutral weighted average
maturity  in  order  to  help  protect the fund from any market disruptions that
Y2K-related or year-end factors may present.

December 15, 1999

(1)  ANNUALIZED EFFECTIVE YIELD IS BASED UPON DIVIDENDS DECLARED DAILY AND
REINVESTED MONTHLY.  PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. YIELDS
FLUCTUATE.  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.  INCOME MAY BE SUBJECT TO STATE AND LOCAL TAXES, AND SOME INCOME
MAY BE SUBJECT TO THE FEDERAL ALTERNATIVE MINIMUM TAX (AMT) FOR CERTAIN
SHAREHOLDERS.

                                                             The Fund

STATEMENT OF INVESTMENTS

November 30, 1999 (Unaudited)

<TABLE>
<CAPTION>


                                                                                              Principal
TAX EXEMPT INVESTMENTS--101.0%                                                               Amount ($)                Value ($)
- ------------------------------------------------------------------------------------------------------------------------------------

ARIZONA--1.8%

Coconino County Pollution Control Corporation,
  Revenue, VRDN

   (Arizona Public Service Co. Project)
<S>                                                                                           <C>                      <C>
   3.80% (LOC; Krediet Bank)                                                                  8,700,000  (a)           8,700,000

Mesa Industrial Development Authority, Revenue, VRDN

   (Discovery Health) 3.90%, Series B (Insured; MBIA and
   Liquidity Facility; Chase Manhattan)                                                       5,800,000  (a)           5,800,000

CALIFORNIA--5.3%

California Higher Education Loan Authority,
  Student Loan Revenue

   3.20%, Series E-5, 6/1/2000 (LOC;
   Student Loan Marketing Association)                                                       14,000,000               14,000,000

California School Cash Reserve Program Authority
   4%, Series A, 7/3/2000 (Insured; AMBAC)                                                   15,000,000               15,076,890

Student Education Loan Marketing Corporation,
   Student Loan Revenue, Refunding, VRDN

   3.55%, Series A (LOC; State Street Bank and Trust Co.)                                    14,000,000  (a)          14,000,000

DELAWARE--9.8%

Delaware Economic Development Authority, Revenue, VRDN:

  (Hospital Billing Collection):

      4%, Series A (Insured; MBIA and Liquidity Facility;
         Morgan Stanley)                                                                     21,325,000  (a)          21,325,000

      4%, Series B (Insured; MBIA and Liquidity Facility;
         Morgan Stanley)                                                                     19,000,000  (a)          19,000,000

      4%, Series C (Insured; MBIA and Liquidity Facility;
         Morgan Stanley)                                                                     34,400,000  (a)          34,400,000

   Solid Waste Disposal and Sewer Facilities (CIBA Specialty)

      3.90%, Series A (LOC; CIBA--Specialty Chemicals)                                        4,400,000  (a)           4,400,000

DISTRICT OF COLUMBIA--1.6%

District of Columbia Housing Finance Agency, SFMR

   3.30%, Series B, 6/15/2000 (LOC; CDC Funding Corp.).                                      13,000,000               13,000,000

FLORIDA--1.2%

Capital Projects Finance Authority, Revenue, VRDN
  (Capital Projects Loan Program)

   3.85%, Series A (Insured; FSA and Liquidity Facility;
   Credit Suisse)                                                                            10,000,000  (a)          10,000,000

GEORGIA--7.8%

Appling County Development Authority, PCR, CP
  (Georgia Power Co. PLT Hatch Project)

   3.90%, 1/14/2000 (LOC; Georgia Power)                                                     10,000,000               10,000,000


                                                                                              Principal

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

GEORGIA (CONTINUED)

Burke County Development Authority, PCR, CP

   3.90%, 1/21/2000 (Insured; AMBAC and
   Liquidity Facility; Rabobank).                                                            10,000,000               10,000,000

Cobb County, School District Notes 3.50%, 12/31/1999                                         11,500,000               11,504,942

Fulton County School District, Construction Sales Tax,
   TAN 3.25%, 12/31/1999.                                                                    15,000,000               15,002,626

Savannah Economic Development Authority,
   Revenue Exempt Facilities, VRDN

   (Home Depot Project) 4.05%, Series A
   (Corp. Guaranty; Home Depot)                                                              17,000,000  (a)          17,000,000

ILLINOIS--7.3%

City of Chicago, Mandatory Tender Notes
   3.75%, 12/1/1999 (LOC; Morgan Guaranty Trust Co.)                                          7,500,000                7,500,000

Illinois Development Finance Authority, PCR,
   VRDN (Illinois Power Co.)

   4%, Series C (LOC; Morgan Guaranty Trust Co.)                                             10,400,000  (a)          10,400,000

Illinois Health Facilities Authority, Revenue, VRDN:

   (Carle Foundation) 3.90% (Insured; AMBAC
      and Liquidity Facility; Bank One Corp.)                                                15,000,000  (a)          15,000,000

   (Revolving Fund Pooled) 3.85%, Series C
      (LOC; Bank One Corp.)                                                                  16,250,000  (a)          16,250,000

Madison County, EIR, VRDN (Shell Wood River Project)
   3.85%, Series A (LOC; Shell Oil Co.)                                                      10,000,000  (a)          10,000,000

INDIANA--1.9%

Indiana Health Facilities Financing Authority, Revenue, CP

   (Ascension Health Credit) 3.80%, Series B, 2/9/2000                                       15,000,000               15,000,000

IOWA--3.3%

Iowa Finance Authority, SWDR, VRDN (Cedar River Paper Co.)

   3.95%, Series A (LOC; Union Bank of Switzerland)                                           7,100,000  (a)           7,100,000

Iowa School Cash Anticipation Program, Iowa School Corporation
   4%, Series A, 6/23/2000 (Insured; FSA)                                                    10,000,000               10,041,730

Louisa County, PCR, Refunding (Iowa-Illinois Gas and Electric)
   3.95%, Series A, 2/22/2000                                                                 9,500,000                9,500,000

KANSAS--2.0%

Butler County, Solid Waste Disposal and Cogeneration,
  Revenue, VRDN

   (Texaco Refinancing and Marketing)
   3.90%, Series B (LOC; Texaco Inc.)                                                        11,600,000  (a)          11,600,000

                                                                                                     The Fund

STATEMENT OF INVESTMENTS (Unaudited) (CONTINUED)

                                                                                              Principal

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

KANSAS (CONTINUED)

Wichita, PCR, Refunding, VRDN (CIC Industries Inc. Project)

   4.225% (LOC; The Bank of New York)                                                         5,000,000  (a)           5,000,000

KENTUCKY--1.2%

Kentucky Association of Counties Advance Revenue

  Cash Flow Borrowing Program,

   COP, TRAN 4%, 6/30/2000                                                                   10,000,000               10,030,784

LOUISIANA--1.5%

New Orleans Aviation Board, Revenue,
  VRDN (Passenger Facility Charge Project)

   4.15% (LOC: Banque Paribas and
   Canadian Imperial Bank of Commerce)                                                        7,400,000  (a)           7,400,000

West Baton Rouge Parish Industrial District # 3,
   Revenue, VRDN (Dow Chemical Co. Project)

   3.95% (LOC; Dow Chemical Co.)                                                              4,500,000  (a)           4,500,000

MARYLAND--1.1%

Carroll County, Revenue, VRDN (Fairhaven and Copper)

   4%, Series B ( BPA; Branch Banking and Trust and Insured;
   Asset Guaranty)                                                                            9,290,000  (a)           9,290,000

MASSACHUSSETTS--2.5%

Commonwealth of Massachussetts, Refunding, VRDN

   3.90%, Series B (LOC; Toronto-Dominion Bank)                                              20,000,000  (a)          20,000,000

MICHIGAN--1.3%

Birmingham, EDR, VRDN (Brown Association Project)
   4.225% (LOC; Deutsche Bank)                                                                1,915,000  (a)           1,915,000

Michigan Housing Development Authority,
   LOR, Refunding, VRDN

   (Harbortown Limited Divide) 3.975% (LOC; Deutsche Bank)                                    1,000,000  (a)           1,000,000

Michigan Strategic Fund, SWDR, VRDN

   (Grayling Generating Project) 3.90% (LOC; Barclays Bank)                                   7,800,000  (a)           7,800,000

MINNESOTA--.3%

Cloquet, Industrial Facilities Revenue,
  VRDN (Potlatch Corp. Project)

   4%, Series C (LOC; Wachovia Bank and Trust Co.)                                            2,300,000  (a)           2,300,000

MISSOURI--1.2%

Saint Charles County, Industrial Development Authority,
  Industrial Revenue, Refunnding, VRDN

   (Country Club Apartments Project)
   3.84% (LOC; Lasalle National Bank)                                                        10,000,000  (a)          10,000,000


                                                                                              Principal

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

NEBRASKA--1.6%

Nebhelp Incorporated, Revenue,
  Multiple Mode Student Loan, VRDN

   3.95%, Series A (Insured; MBIA and LOC;
   Student Loan Marketing Association)                                                       12,995,000  (a)          12,995,000

NEVADA--.4%

Clark County, IDR, VRDN (Nevada Cogeneration Association 2)
   3.90% (LOC; ABN-Amro Bank)                                                                 3,000,000  (a)           3,000,000

NEW HAMPSHIRE--.9%

New Hampshire Business Finance Authority, IDR, VRDN

   (Keeney Manufacturing Co. Project) 3.90% (LOC; Fleet Bank)                                 7,100,000  (a)           7,100,000

NEW JERSEY--.9%

State of New Jersey, CP 3.60%, Series A, 12/1/1999

   (Liquidity Facility: Bank of Nova Scotia,
   Commerzbank and Toronto-Dominion Bank)                                                     7,000,000  7,000,000

NEW MEXICO--1.2%

State of New Mexico, TRAN 4%, 6/30/2000                                                      10,000,000                10,043,155

NEW YORK--5.8%

Metropolitan Transportation Authority,
  Transit Facilities Revenue, CP

   3.80%, Series 1, 4/6/2000 (LOC; ABN-Amro Bank)                                            20,000,000                20,000,000

New York City Health and Hospital Corporation,
   Health System Revenue

   3.75%, Series A, 2/1/2000 (LOC; Morgan Guaranty Trust Co.)                                12,000,000                12,000,000

New York Power Authority, CP 3.60%, Series 4, 12/7/1999

   (Liquidity Facility: The Bank of New York,
   Bank of Nova Scotia, Bayerische Landesbank,
   Chase Manhattan Bank, Commerzbank, Credit Locale de France,
   First Union National Bank of North Carolina,
   Landesbank Hessen, Morgan Guaranty Trust Co. and
   State Street Bank and Trust Co.)                                                           8,000,000                8,000,000

Port Authority of New York and New Jersey,
   Special Obligation Revenue, VRDN

   (Versatile Structure Obligation) 3.85%, Series 6
   ( Liquidity Facility; Bank of Nova Scotia)                                                 7,000,000  (a)           7,000,000

NORTH CAROLINA--.9%

Craven County Industrial Facilities and
  Pollution Control Financing Authority, VRDN

   (Craven Wood Energy) 3.80%, Series C (LOC; ABN-Amro Bank)                                  6,900,000  (a)           6,900,000

                                                                                                     The Fund

STATEMENT OF INVESTMENTS (Unaudited) (CONTINUED)

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

NORTH DAKOTA--1.2%

North Dakota Housing Finance Agency, Revenue,
  Housing Finance Program

   (Home Mortgage) 3.20%, Series C, 4/1/2000                                                 10,000,000               10,000,000

OHIO--3.0%

Cuyahoga County, HR, VRDN (Cleveland Clinic Foundation)

   3.90%, Series A (LOC; Morgan Guaranty Trust Co.)                                           3,200,000  (a)           3,200,000

Ohio Housing Finance Agency, Mortgage Revenue
   3.05%, Series A-2, 3/1/2000                                                               20,000,000               20,000,000

Sharonville, IDR, VRDN (Edgecomb Metals Co. Project)
   3.90% (LOC; Wells Fargo Bank)                                                              1,150,000  (a)           1,150,000

PENNSYLVANIA--5.2%

Lancaster County Hospital Authority, Revenue,
  VRDN (Masconic Homes)

   3.90% ( Insured; AMBAC and Liquidity Facility; PNC Bank)                                  21,240,000  (a)          21,240,000

Pennsylvania Higher Education Assistance Agency,
   Student Loan Revenue, VRDN:

      3.95%, Series A (LOC; Student Loan Marketing Association)                              12,100,000  (a)          12,100,000

      3.95%, Series C (LOC; Student Loan Marketing Association)                               8,900,000  (a)           8,900,000

RHODE ISLAND--1.7%

Rhode Island Housing and Mortgage Finance Corporation

   (Homeowner Opportunity) 3.15%, Series B, 12/15/1999
   (LOC; Transamerica Life and Insurance)                                                    13,815,000               13,815,000

SOUTH CAROLINA--2.7%

South Carolina Jobs Economic Development Authority,
  EDR, VRDN (Wellman Inc. Project)

   3.90% (LOC; Wachovia Bank and Trust Co.)                                                  14,310,000  (a)          14,310,000

York County, Industrial Revenue, VRDN (Textron Project)

   5.313% (LOC; Deutsche Bank)                                                                7,500,000  (a)           7,500,000

TENNESSEE--1.7%

Sevier County Public Building Authority,
  Local Government Public Improvement, VRDN:

      3.85%, Series B-2 (Insured; AMBAC and SBPA; Krediet Bank)                               3,745,000  (a)           3,745,000

      3.85%, Series III-C-4 (Insured; AMBAC and Liquidity Facility;
         Landesbank Hessen)                                                                  10,000,000  (a)          10,000,000

TEXAS--16.5%

Brazos River Authority, PCR, Refunding,
  VRDN (Texas Utility Electric Co.):

      3.95%, Series A (Insured; MBIA and Liquidity Facility;
         The Bank of New York)                                                               10,100,000  (a)          10,100,000

      3.95%, Series C (LOC; The Bank of New York)                                            10,000,000  (a)          10,000,000


                                                                                              Principal

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

TEXAS (CONTINUED)

Brazos River Harbor Naval District, VRDN

  Brazoria County, Revenue:

      (Dow Chemical Co. Project) 3.95% (LOC; Dow Chemical Co.)                               11,400,000  (a)          11,400,000

      Multi-Mode (BASF Corp. Project) 3.95% (LOC; BASF Corp.)                                 6,000,000  (a)           6,000,000

   Harbor Revenue:

      (BASF Corp. Project) 3.95% (LOC; BASF Corp.)                                           15,000,000  (a)          15,000,000

      (Dow Chemical Co. Project) 3.95% (LOC; Dow Chemical Co.)                               22,800,000  (a)          22,800,000

PanHandle-Plains Higher Education Authority Inc.,
   Student Loan Revenue, VRDN

   3.85%, Series A (LOC; Student Loan Marketing Association)                                 13,000,000  (a)          13,000,000

State of Texas, TRAN 4.50%, Series A, 8/31/2000                                              15,000,000               15,086,817

Texas Department of Housing and Community Affairs,
   Residential Mortgage, Revenue

   3.90%, Series B-2, 5/1/2000                                                               10,000,000               10,000,000

Texas Public Finance Authority, Revenue, CP:

   3.85%, Series A, 4/5/2000                                                                 10,300,000               10,300,000

   3.80%, Series B, 4/10/2000                                                                10,000,000               10,000,000

UTAH--1.7%

Intermountain Power Agency, Power Supply Revenue, CP

   3.80%, Series B-4, 3/9/2000 (Liquidity Facility:
   Bank of America and Bank of Nova Scotia)                                                  13,500,000               13,500,000

VIRGINIA--1.2%

Richmond Industrial Development Authority, Revenue,
  VRDN (Cogentrix of Richmond Project)

   4.10%, Series A (LOC; Banque Paribas)                                                     10,000,000  (a)          10,000,000

WASHINGTON--.6%

Port Seattle, CP 3.60%, 12/1/1999 (LOC; Commerzbank)  5,000,000  5,000,000

WISCONSIN--1.4%

Wisconsin Health and Educational Facilities Authority, Revenue,
  CP (SSM Health Care)

   3.65%, Series B, 12/1/1999 (Insured; MBIA and
   Liquidity Facility; Bank One Corp.)                                                       11,440,000               11,440,000

WYOMING--.4%

Lincoln County, PCR, VRDN (Exxon Project)
   3.85%, Series B (LOC; Exxon Corp)                                                          3,000,000  (a)           3,000,000
- ------------------------------------------------------------------------------------------------------------------------------------

TOTAL INVESTMENTS (cost $811,463,015)                                                            100.1%              811,461,944

LIABILITIES, LESS CASH AND RECEIVABLES                                                            (.1%)                (472,492)

NET ASSETS                                                                                       100.0%              810,989,452

                                                                                                     The Fund

STATEMENT OF INVESTMENTS (Unaudited) (CONTINUED)

Summary of Abbreviations

AMBAC               American Municipal Bond                             PCR                  Pollution Control Revenue

                        Assurance Corporation                           SBPA                 Standby Bond

BPA                 Bond Purchase Agreement                                                      Purchase Agreement

COP                 Certificate of Participation                        SFMR                 Single Family

CP                  Commercial Paper                                                             Mortgage Revenue

EDR                 Economic Development Revenue                        SWDR                 Solid Waste

EIR                 Environment Improvement Revenue                                              Disposal Revenue

FSA                 Financial Security Assurance                        TAN                  Tax Anticipation Notes

HR                  Hospital Revenue                                    TRAN                 Tax and Revenue

IDR                 Industrial Development Revenue                                               Anticipation Notes

LOC                 Letter of Credit                                    VRDN                 Variable Rate

LOR                 Limited Obligation Revenue                                                   Demand Notes

MBIA                Municipal Bond Investors

                        Assurance Insurance Corporation
</TABLE>



Summary of Combined Ratings

<TABLE>
<CAPTION>


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

<S>                              <C>                             <C>                                              <C>
F1+/F1                           VMIG1/MIG1, P1                  SP1+/SP1, A1+/A1                                 97.9

AAA/AA (b)                       AAA/AA (b)                      AAA/AA (b)                                        2.1

                                                                                                                 100.0

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

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

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>



STATEMENT OF ASSETS AND LIABILITIES

November 30, 1999 (Unaudited)

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

ASSETS ($):

Investments in securities--See Statement of
Investments                                           811,463,015   811,461,944

Cash                                                                  5,120,284

Interest receivable                                                   4,711,233

Prepaid expenses and other assets                                        50,723

                                                                    821,344,184
- --------------------------------------------------------------------------------

LIABILITIES ($):

Due to The Dreyfus Corporation and affiliates                           284,202

Payable for investment securities purchased                          10,000,000

Accrued expenses and other liabilities                                   70,530

                                                                     10,354,732
- --------------------------------------------------------------------------------

NET ASSETS ($)                                                      810,989,452
- --------------------------------------------------------------------------------

COMPOSITION OF NET ASSETS ($):

Paid-in capital                                                     811,264,368

Accumulated net realized gain (loss) on investments                   (273,845)

Accumulated gross unrealized (depreciation) on investments              (1,071)
- --------------------------------------------------------------------------------

NET ASSETS ($)                                                      810,989,452
- --------------------------------------------------------------------------------

SHARES OUTSTANDING

(5 billion shares of $.001 par value Common Stock authorized)       813,039,904

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

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

STATEMENT OF OPERATIONS

Six Months Ended November 30, 1999 (Unaudited)

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

INVESTMENT INCOME ($):

INTEREST INCOME                                                     14,837,441

EXPENSES:

Management fee--Note 2(a)                                            2,211,186

Shareholder servicing costs--Note 2(b)                                 350,469

Custodian fees                                                          39,952

Directors' fees and expenses--Note 2(c)                                 29,632

Professional fees                                                       25,878

Registration fees                                                       15,910

Prospectus and shareholders' reports                                    15,295

Miscellaneous                                                           11,083

TOTAL EXPENSES                                                       2,699,405

INVESTMENT INCOME--NET                                              12,138,036
- --------------------------------------------------------------------------------

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

Net realized gain (loss) on investments                                    430

Net unrealized appreciation (depreciation) on investments              (1,071)

NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS                   (641)

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                12,137,395

SEE NOTES TO FINANCIAL STATEMENTS.


STATEMENT OF CHANGES IN NET ASSETS

                                         Six Months Ended
                                        November 30, 1999           Year Ended
                                              (Unaudited)         May 31, 1999
- --------------------------------------------------------------------------------

OPERATIONS ($):

Investment income--net                         12,138,036            25,245,090

Net realized gain (loss) from investments             430             (117,565)

Net unrealized appreciation (depreciation)
  on investments                                   (1,071)               1,071

NET INCREASE (DECREASE) IN NET ASSETS
   RESULTING FROM OPERATIONS                    12,137,395           25,128,596
- --------------------------------------------------------------------------------

DIVIDENDS TO SHAREHOLDERS FROM ($):

INVESTMENT INCOME--NET                       (12,138,036)         (25,379,021)
- --------------------------------------------------------------------------------

CAPITAL STOCK TRANSACTIONS ($1.00 PER SHARE):

Net proceeds from shares sold               1,443,402,807        3,315,094,165

Dividends reinvested                            7,006,360           14,582,815

Cost of shares redeemed                   (1,540,546,772)      (3,332,016,091)

INCREASE (DECREASE) IN NET ASSETS FROM
   CAPITAL STOCK TRANSACTIONS                (90,137,605)          (2,339,111)

TOTAL INCREASE (DECREASE) IN NET ASSETS      (90,138,246)          (2,589,536)
- --------------------------------------------------------------------------------

NET ASSETS ($):

Beginning of period                           901,127,698          903,717,234

END OF PERIOD                                 810,989,452          901,127,698

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

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>


                                          Six Months Ended
                                         November 30, 1999                                Year Ended May 31,
                                                                  ------------------------------------------------------------------

                                                (Unaudited)       1999           1998          1997           1996          1995
- ------------------------------------------------------------------------------------------------------------------------------------

PER SHARE DATA ($):

Net asset value,
<S>                                                   <C>         <C>            <C>           <C>            <C>           <C>
   beginning of period                                1.00        1.00           1.00          1.00           1.00          1.00

Investment Operations:

Investment income--net                                 .014        .027           .031          .029           .031          .029

Distributions:

Dividends from
   investment income--net                             (.014)      (.027)         (.031)        (.029)         (.031)        (.029)

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

TOTAL RETURN (%)                                      2.75(a)     2.78           3.13          2.98           3.16          2.98
- ------------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to
   average net assets                                  .61(a)      .63            .66           .65            .64           .62

Ratio of net investment income
   to average net assets                              2.74(a)     2.73           3.08          2.94           3.11          2.91
- ------------------------------------------------------------------------------------------------------------------------------------

Net Assets,
   end of period ($ x 1,000)                         810,989   901,128        903,717      1,024,649       950,598       933,311

(A)  ANNUALIZED.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>



NOTES TO FINANCIAL STATEMENTS (Unaudited)

NOTE 1--Significant Accounting Policies:

Dreyfus  Municipal  Money Market Fund, Inc. (the "fund") is registered under the
Investment  Company  Act  of  1940,  as  amended  (the  "Act"), as a diversified
open-end  management  investment  company. The fund's investment objective is to
maximize  current income exempt from Federal income tax to the extent 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 Directors 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
represent  amortized  cost.  Under  the terms of the custody agreement, the fund
received  net  earnings credits of $16,291 based on available cash balances left
on deposit. Income earned under this arrangement is included in interest income

                                                             The Fund

NOTES TO FINANCIAL STATEMENTS (Unaudited) (CONTINUED)

(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 $250,000
available  for  Federal  income  tax  purposes  to be applied against future net
securities  profits, if any, realized subsequent to May 31, 1999. This amount is
calculated  based  on  Federal  income  tax  regulations  which  may differ from
financial reporting in accordance with generally accepted accounting principles.
If  not  applied, $1,000 of the carryover expires in fiscal 2000, $4,000 expires
in  fiscal 2001, $49,000 expires in fiscal 2002, $36,000 expires in fiscal 2003,
$7,000 expires in fiscal 2004, $2,000 expires in fiscal 2005, $21,000 expires in
fiscal 2006 and $130,000 expires in fiscal 2007.

At  November  30,  1999, 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).

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
November  30,  1999,  the  fund was charged $186,464 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 services for the fund. During the period
ended  November 30, 1999, the fund was charged $121,382 pursuant to the transfer
agency agreement.

(C)  Each  director  who  is  not  an  "affiliated person" as defined in the Act
receives from the fund an annual fee of $4,500 and an attendance fee of $500 per
meeting.  The  Chairman  of  the  Board  receives  an  additional  25%  of  such
compensation.

                                                             The Fund

NOTES

                                                           For More Information

                        Dreyfus Municipal Money Market Fund, Inc.

                        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

                        Premier Mutual Fund Services, Inc.

                        60 State Street

                        Boston, MA 02109

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                                  910SA9911





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