DREYFUS INSTITUTIONAL MONEY MARKET FUND INC
NSAR-B, 1997-02-28
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<PAGE>      PAGE  1
000 B000000 12/31/96
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
007 C010100  1
007 C020100 MONEY MARKET SERIES
007 C030100 N
007 C010200  2
007 C020200 GOVERNMENT SECURITIES SERIES
007 C030200 N
007 C010300  3
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
015 A00AA01 THE BANK OF NEW YORK
015 B00AA01 C
015 C01AA01 NEW YORK
015 C02AA01 NY
015 C03AA01 10286
015 E01AA01 X
018  00AA00 Y
019 A00AA00 Y
019 B00AA00  152
019 C00AA00 DREYFUSFAM
022 A000001 AUBREY G. LANSTON & CO. INC.
022 B000001 13-5552129
022 C000001   6687575
022 D000001         0
<PAGE>      PAGE  2
022 A000002 SBC CAPITAL MARKETS, INC.
022 B000002 13-3498485
022 C000002   5268955
022 D000002         0
022 A000003 UBS SECURITIES INC.
022 B000003 13-2932996
022 C000003   4271196
022 D000003     52311
022 A000004 DAIWA SECURITIES AMERICA INC.
022 B000004 13-5680329
022 C000004   2416000
022 D000004         0
022 A000005 NIKKO SECURITIES CO. INTERNATIONAL, INC.
022 B000005 94-1302123
022 C000005   2231742
022 D000005         0
022 A000006 LEHMAN BROTHERS INC.
022 B000006 13-2518466
022 C000006   1635777
022 D000006    155998
022 A000007 REPUBLIC NATIONAL BANK OF NEW YORK
022 B000007 13-2774727
022 C000007   1443293
022 D000007         0
022 A000008 GOLDMAN, SACHS & CO.
022 B000008 13-5108880
022 C000008   1411404
022 D000008     14723
022 A000009 SANWA SECURITIES (USA) CO., L.P.
022 B000009 13-3046258
022 C000009   1411472
022 D000009      9487
022 A000010 MORGAN STANLEY & CO. INCORPORATED
022 B000010 13-2655998
022 C000010   1348448
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<PAGE>      PAGE  3
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 N
077 Q020000 N
077 Q030000 N
080 A00AA00 VIGILANT INSURANCE COMPANY
080 B00AA00 NATIONAL UNION FIRE INSURANCE CO OF PITTS PA
080 C00AA00   125000
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082 A00AA00 N
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025 A000101 GOLDMAN, SACHS & CO.
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025 A000102 LEHMAN BROTHERS INC.
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025 A000103 AUBREY G. LANSTON & CO. INC.
025 B000103 13-5552129
025 C000103 D
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055 A000100 Y
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056  000100 N
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062 A000100 Y
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062 I000100  34.5
062 J000100   4.1
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<PAGE>      PAGE  6
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025 A000201 AUBREY G. LANSTON & CO. INC.
025 B000201 13-5552129
025 C000201 D
025 D000201    5000
025 A000202 DAIWA SECURITIES AMERICA INC.
025 B000202 13-5680329
025 C000202 D
025 D000202    7000
025 A000203 THE NIKKO SECURITIES CO. INTERNATIONAL INC.
025 B000203 94-1302123
025 C000203 D
025 D000203    6000
025 A000204 UBS SECURITIES INC.
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<PAGE>      PAGE  7
028 G040200    259793
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055 A000200 Y
055 B000200 N
056  000200 N
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062 A000200 Y
062 B000200  58.1
062 C000200   0.0
062 D000200  41.1
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<PAGE>      PAGE  9
SIGNATURE   DOUGLAS C. CONROY                            
TITLE       ASSISTANT TREASURER 
 


<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-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                           479455
<INVESTMENTS-AT-VALUE>                          479455
<RECEIVABLES>                                     2641
<ASSETS-OTHER>                                    1335
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<TOTAL-ASSETS>                                  483431
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<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        483167
<SHARES-COMMON-STOCK>                           483167
<SHARES-COMMON-PRIOR>                           402124
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<ACCUMULATED-NET-GAINS>                           (11)
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<DIVIDEND-INCOME>                                    0
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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> 02
   <NAME> GOVERNMENT SECURITIES SERIES
<MULTIPLIER> 1000
       
<S>                             <C>
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<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>


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