DREYFUS INSTITUTIONAL MONEY MARKET FUND INC
NSAR-B, 1996-02-29
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<PAGE>      PAGE  1
000 B000000 12/31/95
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
012 A00AA01 DREYFUS TRANSFER INC.
012 B00AA01 85-11312
012 C01AA01 PROVIDENCE
012 C02AA01 RI
012 C03AA01 02940
012 C04AA01 9671
018  00AA00 Y
019 A00AA00 Y
019 B00AA00  162
019 C00AA00 DREYFUSFAM
022 A000001 DAIWA SECURITIES AMERICA INC.
022 B000001 13-5680329
022 C000001   4572102
022 D000001         0
022 A000002 UBS SECURITIES INC.
022 B000002 13-2932996
022 C000002   4158382
022 D000002    157173
022 A000003 EASTBRIDGE CAPITAL INC.
022 B000003 13-3501117
022 C000003   3683878
022 D000003     60530
022 A000004 AUBREY G. LANSTON & CO. INC.
022 B000004 13-5552129
022 C000004   3391862
022 D000004         0
022 A000005 SBC CAPITAL MARKETS, INC.
022 B000005 13-3498485
<PAGE>      PAGE  2
022 C000005   3374261
022 D000005         0
022 A000006 THE NIKKO SECURITIES CO. INTERNATIONAL, INC.
022 B000006 94-1302123
022 C000006   2812870
022 D000006         0
022 A000007 LEHMAN BROTHERS INC.
022 B000007 13-2518466
022 C000007   2470378
022 D000007     66572
022 A000008 YAMAICHI INTERNATIONAL (AMERICA), INC.
022 B000008 13-5659656
022 C000008   1958000
022 D000008         0
022 A000009 MORGAN STANLEY & CO. INCORPORATED
022 B000009 13-2655998
022 C000009   1807639
022 D000009     20008
022 A000010 BARCLAYS DE ZOETE WEDD SECURITIES, INC.
022 B000010 13-3551367
022 C000010   1265472
022 D000010     29844
023 C000000   36836620
023 D000000     688286
077 A000000 Y
077 B000000 Y
077 C000000 N
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 N
077 Q020000 N
077 Q030000 N
078  000000 N
080 A00AA00 NATIONAL UNION FIRE INS. COMPANY OF PITTS, PA
080 B00AA00 VIGILANT INSURANCE COMPANY
080 C00AA00   125000
081 A00AA00 Y
081 B00AA00 173
082 A00AA00 N
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<PAGE>      PAGE  3
083 A00AA00 N
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<PAGE>      PAGE  4
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070 F020100 N
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070 G020100 N
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070 I020100 N
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<PAGE>      PAGE  5
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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070 D010200 N
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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
070 K020200 N
070 L010200 N
070 L020200 N
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<PAGE>      PAGE  8
070 O020200 Y
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<PAGE>      PAGE  9
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SIGNATURE   JOHN J. PYBURN                               
TITLE       ASSISTANT TREASURER 
 

WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000315783
<NAME> DREYFUS INSTITUTIONAL MONEY MARKET FUND
<SERIES>
   <NUMBER> 01
   <NAME> MONEY MARKET SERIES
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-END>                               DEC-31-1995
<INVESTMENTS-AT-COST>                           401138
<INVESTMENTS-AT-VALUE>                          401138
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<ASSETS-OTHER>                                      19
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<TOTAL-ASSETS>                                  403351
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<TOTAL-LIABILITIES>                               1319
<SENIOR-EQUITY>                                      0
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<SHARES-COMMON-STOCK>                           402124
<SHARES-COMMON-PRIOR>                           363072
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<OVERDISTRIBUTION-GAINS>                             0
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<DIVIDEND-INCOME>                                    0
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<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (18814)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        4216643
<NUMBER-OF-SHARES-REDEEMED>                  (4180043)
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<ACCUMULATED-NII-PRIOR>                              0
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</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000315783
<NAME> DREYFUS INSTITUTIONAL MONEY MARKET FUND
<SERIES>
   <NUMBER> 02
   <NAME> GOVERNMENT SERIES
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-END>                               DEC-31-1995
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<INVESTMENTS-AT-VALUE>                          123361
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<ASSETS-OTHER>                                       4
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<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           (82)
<OVERDISTRIBUTION-GAINS>                             0
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<NET-ASSETS>                                    123171
<DIVIDEND-INCOME>                                    0
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<EXPENSE-RATIO>                                   .006
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>


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