DREYFUS INSTITUTIONAL MONEY MARKET FUND INC
NSAR-B, 1995-02-28
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<PAGE>      PAGE  1
000 B000000 12/31/94
000 C000000 315783
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0
000 J000000 U
001 A000000 DREYFUS INSTITUTIONAL MONEY MARKET FUND
001 B000000 811-3025
001 C000000 2129226807
002 A000000 144 GLENN CURTISS BOULEVARD
002 B000000 UNIONDALE
002 C000000 NY
002 D010000 11556
002 D020000 0144
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  2
011 A00AA01 PREMIER MUTUAL FUND SERVICES, INC.
011 B00AA01 8-47312
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02109
013 A00AA01 ERNST & YOUNG LLP
013 B01AA01 NEW YORK
013 B02AA01 NY
013 B03AA01 10019
018  00AA00 Y
019 A00AA00 Y
019 B00AA00  153
019 C00AA00 DREYFUSFAM
022 A000001 KIDDER, PEABODY & CO. INCORPORATED
022 B000001 13-5650440
022 C000001   5872327
022 D000001         0
022 A000002 YAMAICHI INTERNATIONAL (AMERICA), INC.
022 B000002 13-5659656
022 C000002   5635952
022 D000002         0
022 A000003 LEHMAN BROTHERS INC.
022 B000003 13-2518466
022 C000003   4191692
022 D000003      6937
022 A000004 DAIWA SECURITIES AMERICA INC.
022 B000004 13-5680329
022 C000004   3581000
<PAGE>      PAGE  2
022 D000004         0
022 A000005 UBS SECURITIES INC.
022 B000005 13-2932996
022 C000005   3006517
022 D000005     83497
022 A000006 GOLDMAN, SACHS & CO.
022 B000006 13-5108880
022 C000006   2132705
022 D000006      4852
022 A000007 REPUBLIC NATIONAL BANK OF NEW YORK
022 B000007 13-2774727
022 C000007   1928508
022 D000007         0
022 A000008 BARCLAYS DE ZOETE WEDD INCORPORATED
022 B000008 13-3551367
022 C000008   1871914
022 D000008      4961
022 A000009 THE NIKKO SECURITIES CO. INTERNATIONAL, INC.
022 B000009 94-1302123
022 C000009   1595000
022 D000009         0
022 A000010 CHEMICAL SECURITIES, INC.
022 B000010 13-3379014
022 C000010   1142000
022 D000010         0
023 C000000   37989861
023 D000000     164092
066 A00AA00 N
067  00AA00 N
068 A00AA00 N
068 B00AA00 N
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077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
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077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 Y
077 Q020000 N
077 Q030000 N
<PAGE>      PAGE  3
078  000000 N
080 A00AA00 NATIONAL UNION FIRE INS. COMPANY OF PITTS, PA
080 B00AA00 VIGILANT INSURANCE COMPANY
080 C00AA00   105000
081 A00AA00 Y
081 B00AA00 146
082 A00AA00 N
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<PAGE>      PAGE  4
062 E000100   0.0
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070 C020100 N
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070 D020100 N
070 E010100 N
070 E020100 N
070 F010100 N
070 F020100 N
070 G010100 N
070 G020100 N
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 N
070 K020100 N
070 L010100 N
070 L020100 N
070 M010100 N
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<PAGE>      PAGE  5
070 Q020100 N
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
028 G020200       700
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055 A000200 Y
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056  000200 N
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062 A000200 Y
062 B000200  55.3
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062 D000200  35.4
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070 A010200 Y
070 A020200 Y
070 B010200 N
070 B020200 N
070 C010200 N
070 C020200 N
070 D010200 N
070 D020200 N
070 E010200 N
070 E020200 N
070 F010200 N
070 F020200 N
070 G010200 N
070 G020200 N
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 N
070 K010200 N
<PAGE>      PAGE  8
070 K020200 N
070 L010200 N
070 L020200 N
070 M010200 N
070 M020200 N
070 N010200 Y
070 N020200 N
070 O010200 Y
070 O020200 N
070 P010200 Y
070 P020200 N
070 Q010200 N
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070 R010200 N
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<PAGE>      PAGE  9
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074 W000200   0.9989
074 X000200      858
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SIGNATURE   JOHN J. PYBURN                               
TITLE       TREASURER           
 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000315783
<NAME> DREYFUS INSTITUTIONAL MONEY MARKET FUND
<SERIES>
   <NUMBER> 1
   <NAME> MONEY MARKET SERIES
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1994
<PERIOD-END>                               DEC-31-1994
<INVESTMENTS-AT-COST>                          363,449
<INVESTMENTS-AT-VALUE>                         363,449
<RECEIVABLES>                                      543
<ASSETS-OTHER>                                      27
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 364,019
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        1,194
<TOTAL-LIABILITIES>                              1,194
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       363,072
<SHARES-COMMON-STOCK>                          363,072
<SHARES-COMMON-PRIOR>                          354,413
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          (247)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                   362,825
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                               14,737
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   2,208
<NET-INVESTMENT-INCOME>                         12,529
<REALIZED-GAINS-CURRENT>                          (12)
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                           12,517
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       12,529
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      3,974,165
<NUMBER-OF-SHARES-REDEEMED>                  3,967,507
<SHARES-REINVESTED>                              2,002
<NET-CHANGE-IN-ASSETS>                           8,648
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        (235)
<OVERDISTRIB-NII-PRIOR>                              0
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<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  2,208
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<PER-SHARE-NAV-BEGIN>                             .999
<PER-SHARE-NII>                                   .036
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                              .036
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               .999
<EXPENSE-RATIO>                                   .006
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<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000315783
<NAME> DREYFUS INSTITUTIONAL MONEY MARKET FUND
<SERIES>
   <NUMBER> 2
   <NAME> GOVERNMENT SECURITIES SERIES
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1994
<PERIOD-END>                               DEC-31-1994
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<INVESTMENTS-AT-VALUE>                         109,080
<RECEIVABLES>                                   10,862
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<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          (123)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
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<DIVIDEND-INCOME>                                    0
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<EQUALIZATION>                                       0
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<PER-SHARE-NAV-BEGIN>                             .999
<PER-SHARE-NII>                                   .034
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<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               .999
<EXPENSE-RATIO>                                   .007
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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