PIONEER MONEY MARKET TRUST
NSAR-A, 1999-08-10
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<PAGE>      PAGE  1
000 A000000 06/30/99
000 C000000 0000812195
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0
000 J000000 A
001 A000000 PIONEER MONEY MARKET TRUST
001 B000000 811-05099
001 C000000 6177427825
002 A000000 60 STATE STREET
002 B000000 BOSTON
002 C000000 MA
002 D010000 02109
002 D020000 1820
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  1
007 C010100  1
007 C020100 PIONEER CASH RESERVES FUND
007 C030100 N
007 C010200  2
007 C010300  3
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
008 A00AA01 PIONEER INVESTMENT MANAGEMENT, INC.
008 B00AA01 A
008 C00AA01 801-8255
008 D01AA01 BOSTON
008 D02AA01 MA
008 D03AA01 02109
008 D04AA01 1820
010 A00AA01 PIONEER INVESTMENT MANAGEMENT, INC.
010 B00AA01 801-8255
010 C01AA01 BOSTON
010 C02AA01 MA
010 C03AA01 02109
010 C04AA01 1820
011 A00AA01 PIONEER FUNDS DISTRIBUTOR, INC.
011 B00AA01 8-41256
011 C01AA01 BOSTON
<PAGE>      PAGE  2
011 C02AA01 MA
011 C03AA01 02109
011 C04AA01 1820
012 A00AA01 PIONEERING SERVICES CORPORATION
012 B00AA01 84-1359
012 C01AA01 BOSTON
012 C02AA01 MA
012 C03AA01 02109
012 C04AA01 1820
013 A00AA01 ARTHUR ANDERSEN LLP
013 B01AA01 BOSTON
013 B02AA01 MA
013 B03AA01 02110
013 B04AA01 2812
015 A00AA01 BROWN BROTHERS HARRIMAN & CO.
015 B00AA01 C
015 C01AA01 BOSTON
015 C02AA01 MA
015 C03AA01 02109
015 C04AA01 1975
015 E01AA01 X
018  00AA00 Y
019 A00AA00 Y
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022 A000001 BROWN BROTHERS
022 B000001 13-4973745
022 C000001   3977600
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022 A000002 LUMMIS & COMPANY
022 B000002 06-0909285
022 C000002    208142
022 D000002      8648
022 A000003 EXXON CREDIT CORP.
022 B000003 13-3072652
022 C000003    202334
022 D000003         0
022 A000004 GOLDMAN SACHS
022 B000004 13-5108880
022 C000004    198137
<PAGE>      PAGE  3
022 D000004         0
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022 C000005     67087
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022 C000007     48996
022 D000007         0
022 A000008 TEXACO INC.
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022 D000008      7154
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022 C000009     41000
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022 A000010 LEHMAN BROTHERS
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054 K00AA00 N
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077 A000000 N
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080 A00AA00 ICI MUTUAL INSURANCE COMPANY
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<PAGE>      PAGE  5
081 A00AA00 Y
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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070 E020100 N
070 F010100 N
070 F020100 N
070 G010100 N
070 G020100 N
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070 K020100 N
070 L010100 N
070 L020100 N
070 M010100 N
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070 O010100 Y
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070 P020100 N
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070 R010100 N
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
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SIGNATURE   ROBERT P. NAULT
TITLE       ASST. SECRETARY


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000812195
<NAME> PIONEER CASH RESERVES FUND
<SERIES>
   <NUMBER> 001
   <NAME> PIONEER CASH RESERVES FUND CLASS A

<S>                             <C>
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</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000812195
<NAME> PIONEER CASH RESERVES FUND
<SERIES>
   <NUMBER> 002
   <NAME> PIONEER CASH RESERVES FUND CLASS B

<S>                             <C>
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</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000812195
<NAME> PIONEER CASH RESERVES FUND
<SERIES>
   <NUMBER> 003
   <NAME> PIONEER CASH RESERVES FUND CLASS C

<S>                             <C>
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</TABLE>


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