DREYFUS INSTITUTIONAL MONEY MARKET FUND INC
NSAR-B, 1999-02-26
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<PAGE>      PAGE  1
000 B000000 12/31/98
000 C000000 315783
000 D000000 N
000 E000000 F
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 2129226850
002 A000000 200 PARK AVENUE
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10166
003  000000 N
004  000000 N
005  000000 N
006  000000 N
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007 C010100  1
007 C020100 GOVERNMENT SECURITIES SERIES
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007 C020200 MONEY MARKET SERIES
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007 C010300  3
007 C010400  4
007 C010500  5
007 C010600  6
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007 C010800  8
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007 C011000 10
018  00AA00 Y
019 A00AA00 Y
019 B00AA00  163
019 C00AA00 DREYFUSFAM
022 A000001 BARCLAYS DE ZOETE WEDD SECURITIES, INC.
022 B000001 13-3551367
022 C000001  13620329
022 D000001     29464
022 A000002 GOLDMAN, SACHS & CO.
022 B000002 13-5108880
022 C000002  12129008
022 D000002     22580
022 A000003 CIBC OPPENHEIMER
022 B000003 13-5942430
022 C000003  11792749
<PAGE>      PAGE  2
022 D000003         0
022 A000004 MORGAN STANLEY DEAN WITTER INCORPORATED
022 B000004 13-2655998
022 C000004  10886634
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022 A000005 BEAR, STEARNS & CO. INC.
022 B000005 13-3299429
022 C000005  10669630
022 D000005      4253
022 A000006 PRUDENTIAL SECURITIES INCORPORATED
022 B000006 22-2347336
022 C000006  10292125
022 D000006      9726
022 A000007 UBS AG
022 B000007 13-2932996
022 C000007   6210648
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022 A000008 AUBREY G. LANSTON & CO. INC.
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080 A00AA00 VIGILANT INSURANCE COMPANY
080 B00AA00 NATIONAL UNION FIRE INSURANCE CO OF PITTS PA
080 C00AA00   125000
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<PAGE>      PAGE  3
025 B000101 13-3299429
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<PAGE>      PAGE  4
056  000100 N
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<PAGE>      PAGE  5
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025 A000201 BEAR, STEARNS & CO. INC.
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<PAGE>      PAGE  6
025 C000201 D
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<PAGE>      PAGE  7
056  000200 N
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<PAGE>      PAGE  8
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SIGNATURE   STEPHANIE D. PIERCE                          
TITLE       ASSISTANT TREASURER 
 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000315783
<NAME> DREYFUS INSTITUTIONAL MONEY MARKET FUND
<SERIES>
   <NUMBER> 2
   <NAME> DREYFUS INSTITUTIONAL GOV'T. SECURITIES SERIES
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<RESTATED> 
<CIK> 0000315783
<NAME> DREYFUS INSTITUTIONAL MONEY MARKET FUND
<SERIES>
   <NUMBER> 1
   <NAME> DREYFUS INSTITUTIONAL MONEY MARKET SERIES
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<S>                             <C>
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</TABLE>


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