DREYFUS INSTITUTIONAL MONEY MARKET FUND INC
NSAR-A, 1997-08-25
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<PAGE>      PAGE  1
000 A000000 06/30/97
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 2129226775
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
018  00AA00 Y
019 A00AA00 Y
019 B00AA00  148
019 C00AA00 DREYFUSFAM
022 A000001 SBC CAPITAL MARKETS, INC.
022 B000001 13-3498485
022 C000001   3573287
022 D000001         0
022 A000002 AUBREY G. LANSTON & CO. INC.
022 B000002 13-5552129
022 C000002   3446039
022 D000002     73567
022 A000003 UBS SECURITIES INC.
022 B000003 13-2932996
<PAGE>      PAGE  2
022 C000003   3206414
022 D000003         0
022 A000004 DAIWA SECURITIES AMERICA INC.
022 B000004 13-5680329
022 C000004   1234000
022 D000004         0
022 A000005 WOOD GUNDY CORP.
022 B000005 13-5492430
022 C000005   1229000
022 D000005         0
022 A000006 BEAR, STEARNS & CO. INC.
022 B000006 13-3299429
022 C000006   1227855
022 D000006         0
022 A000007 SANWA SECURITIES (USA) CO., L.P.
022 B000007 13-3046258
022 C000007   1169000
022 D000007         0
022 A000008 REPUBLIC NATIONAL BANK OF NEW YORK
022 B000008 13-2774727
022 C000008   1108855
022 D000008         0
022 A000009 THE NIKKO SECURITIES CO. INTERNATIONAL, INC.
022 B000009 94-1302123
022 C000009   1035000
022 D000009         0
022 A000010 GOLDMAN, SACHS & CO.
022 B000010 13-5108880
022 C000010    910098
022 D000010     52908
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025 A000101 BEAR, STEARNS & CO. INC.
025 B000101 13-3299429
025 C000101 D
<PAGE>      PAGE  3
025 D000101   19892
025 A000102 GOLDMAN, SACHS & CO.
025 B000102 13-5108880
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025 A000103 SBC CAPITAL MARKETS, INC.
025 B000103 13-3498485
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062 A000100 Y
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062 I000100  45.3
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070 C020100 N
070 D010100 N
070 D020100 N
070 E010100 N
070 E020100 N
070 F010100 N
070 F020100 N
070 G010100 N
070 G020100 N
070 H010100 N
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025 A000201 SBC CAPITAL MARKETS, INC.
025 B000201 13-3498485
025 C000201 D
025 D000201   10000
025 A000202 UBS SECURITIES INC.
025 B000202 13-2932996
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025 A000203 DELETE
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<PAGE>      PAGE  7
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062 A000200 Y
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062 I000200   0.0
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064 A000200 Y
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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
<PAGE>      PAGE  8
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
070 M010200 N
070 M020200 N
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<PAGE>      PAGE  9
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SIGNATURE   MICHEAL PETRUCELLI                           
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> 001
   <NAME> MONEY MARKET SERIES
<MULTIPLIER> 1000
       
<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000315783
<NAME> DREYFUS INSTITUTIONAL MONEY MARKET FUND
<SERIES>
   <NUMBER> 001
   <NAME> GOVERNMENT SERIES
<MULTIPLIER> 1000
       
<S>                             <C>
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</TABLE>


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