<PAGE> PAGE 1
000 A000000 12/31/98
000 C000000 0000312538
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 U
001 A000000 CENTENNIAL MONEY MARKET TRUST
001 B000000 811-2945
001 C000000 3037683200
002 A000000 6803 SOUTH TUCSON WAY
002 B000000 ENGLEWOOD
002 C000000 CO
002 D010000 80112
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
007 C010100 1
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 A000001 CENTENNIAL ASSET MANAGEMENT CORPORATION
008 B000001 A
008 C000001 801-14003
008 D010001 DENVER
008 D020001 CO
008 D030001 80231
011 A000001 CENTENNIAL ASSET MANAGEMENT CORPORATION
011 B000001 8-22948
011 C010001 DENVER
011 C020001 CO
011 C030001 80231
012 A000001 SHAREHOLDER SERVICES, INC.
012 B000001 84-907
012 C010001 ENGLEWOOD
012 C020001 CO
012 C030001 80112
012 C040001 3924
013 A000001 DELOITTE & TOUCHE LLP
013 B010001 DENVER
<PAGE> PAGE 2
013 B020001 CO
013 B030001 80202
014 A000001 A.G. EDWARDS & SONS INC.
014 B000001 8-13580
015 A000001 CITIBANK, N.A.
015 B000001 C
015 C010001 NEW YORK
015 C020001 NY
015 C030001 10043
015 E010001 X
018 000000 Y
019 A000000 Y
019 B000000 6
019 C000000 CENTENNIAL
020 C000001 0
020 C000002 0
020 C000003 0
020 C000004 0
020 C000005 0
020 C000006 0
020 C000007 0
020 C000008 0
020 C000009 0
020 C000010 0
021 000000 0
022 A000001 GOLDMAN, SACHS & CO.
022 B000001 13-5108880
022 C000001 1667616
022 D000001 0
022 A000002 CHASE MANHATTAN BANK, N.A. (THE)
022 B000002 13-2633612
022 C000002 895702
022 D000002 0
022 A000003 LEHMAN BROTHERS, INC.
022 B000003 13-2518466
022 C000003 480282
022 D000003 0
022 A000004 MORGAN STANLEY & CO., INC.
022 B000004 13-2655998
022 C000004 434144
022 D000004 0
022 A000005 FIRST CHICAGO CAPITAL MARKET
022 B000005 36-3595942
022 C000005 324838
022 D000005 0
022 A000006 DEUTSCHE BANK
022 B000006 13-2730828
022 C000006 148554
022 D000006 0
022 A000007 BEAR STEARNS & CO., INC.
022 B000007 13-3299429
<PAGE> PAGE 3
022 C000007 145959
022 D000007 0
022 A000008 LAMBERSON KNIGHT CAPITAL MARKETS, INC.
022 B000008 22-2596731
022 C000008 145780
022 D000008 0
022 A000009 SALOMON SMITH BARNEY
022 B000009 13-3371860
022 C000009 97021
022 D000009 0
022 A000010 BANKERS TRUST CO.
022 B000010 13-4941247
022 C000010 82331
022 D000010 0
023 C000000 4760955
023 D000000 0
024 000000 N
025 D000001 0
025 D000002 0
025 D000003 0
025 D000004 0
025 D000005 0
025 D000006 0
025 D000007 0
025 D000008 0
026 A000000 Y
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027 000000 Y
028 A010000 3634583
028 A020000 57471
028 A030000 0
028 A040000 3463652
028 B010000 3625093
028 B020000 73108
028 B030000 0
028 B040000 3380989
028 C010000 3907793
028 C020000 59636
028 C030000 0
028 C040000 3841966
028 D010000 3751900
028 D020000 59332
028 D030000 0
028 D040000 3271691
<PAGE> PAGE 4
028 E010000 3547128
028 E020000 75124
028 E030000 0
028 E040000 3146613
028 F010000 4728045
028 F020000 90288
028 F030000 0
028 F040000 4751851
028 G010000 23194542
028 G020000 414959
028 G030000 0
028 G040000 21856762
028 H000000 0
029 000000 N
030 A000000 0
030 B000000 0.00
030 C000000 0.00
031 A000000 0
031 B000000 0
032 000000 0
033 000000 0
034 000000 N
035 000000 0
036 B000000 0
037 000000 N
038 000000 0
039 000000 N
040 000000 Y
041 000000 Y
042 A000000 0
042 B000000 0
042 C000000 0
042 D000000 100
042 E000000 0
042 F000000 0
042 G000000 0
042 H000000 0
043 000000 16252
044 000000 0
045 000000 Y
046 000000 N
047 000000 Y
048 000000 0.000
048 A010000 250000
048 A020000 0.500
048 B010000 250000
048 B020000 0.475
048 C010000 250000
048 C020000 0.450
048 D010000 250000
048 D020000 0.425
<PAGE> PAGE 5
048 E010000 250000
048 E020000 0.400
048 F010000 250000
048 F020000 0.375
048 G010000 500000
048 G020000 0.350
048 H010000 0
048 H020000 0.000
048 I010000 0
048 I020000 0.000
048 J010000 0
048 J020000 0.000
048 K010000 2000000
048 K020000 0.325
049 000000 N
050 000000 N
051 000000 N
052 000000 N
053 A000000 N
054 A000000 Y
054 B000000 Y
054 C000000 Y
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 Y
054 H000000 Y
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 Y
054 M000000 Y
054 N000000 N
054 O000000 Y
055 A000000 N
055 B000000 N
056 000000 N
057 000000 N
058 A000000 N
059 000000 Y
060 A000000 Y
060 B000000 Y
061 000000 25
062 A000000 Y
062 B000000 0.0
062 C000000 0.3
062 D000000 0.0
062 E000000 0.0
062 F000000 0.1
062 G000000 0.0
062 H000000 0.0
<PAGE> PAGE 6
062 I000000 93.3
062 J000000 0.0
062 K000000 0.0
062 L000000 5.6
062 M000000 0.0
062 N000000 0.0
062 O000000 0.0
062 P000000 0.0
062 Q000000 0.0
062 R000000 0.0
063 A000000 68
063 B000000 0.0
064 A000000 Y
064 B000000 N
066 A000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
070 A020000 Y
070 B010000 N
070 B020000 N
070 C010000 N
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 N
070 E020000 N
070 F010000 N
070 F020000 N
070 G010000 N
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 Y
070 K010000 N
070 K020000 N
070 L010000 Y
070 L020000 Y
070 M010000 N
070 M020000 N
070 N010000 Y
070 N020000 N
070 O010000 N
070 O020000 N
070 P010000 Y
070 P020000 Y
<PAGE> PAGE 7
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000 0
071 B000000 0
071 C000000 0
071 D000000 0
072 A000000 6
072 B000000 451003
072 C000000 0
072 D000000 0
072 E000000 0
072 F000000 27367
072 G000000 0
072 H000000 0
072 I000000 7917
072 J000000 718
072 K000000 401
072 L000000 354
072 M000000 29
072 N000000 902
072 O000000 0
072 P000000 0
072 Q000000 0
072 R000000 21
072 S000000 32
072 T000000 16252
072 U000000 0
072 V000000 0
072 W000000 16
072 X000000 54009
072 Y000000 0
072 Z000000 396994
072AA000000 89
072BB000000 76
072CC010000 0
072CC020000 0
072DD010000 397035
072DD020000 0
072EE000000 0
073 A010000 0.0246
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 15207
074 B000000 0
074 C000000 16753836
074 D000000 0
074 E000000 0
074 F000000 0
<PAGE> PAGE 8
074 G000000 0
074 H000000 0
074 I000000 0
074 J000000 0
074 K000000 0
074 L000000 249605
074 M000000 592
074 N000000 17019240
074 O000000 0
074 P000000 1475
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 150896
074 S000000 0
074 T000000 16866869
074 U010000 16867326
074 U020000 0
074 V010000 1.00
074 V020000 0.00
074 W000000 0.9997
074 X000000 1156906
074 Y000000 0
075 A000000 16155734
075 B000000 0
076 000000 0.00
077 A000000 N
078 000000 N
080 A000000 ICI MUTUAL INSURANCE CO.
080 C000000 85000
081 A000000 Y
081 B000000 95
082 A000000 N
082 B000000 0
083 A000000 N
083 B000000 0
084 A000000 N
084 B000000 0
085 A000000 Y
085 B000000 N
086 A010000 0
086 A020000 0
086 B010000 0
086 B020000 0
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
<PAGE> PAGE 9
086 F010000 0
086 F020000 0
SIGNATURE GEORGE C. BOWEN
TITLE TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 312538
<NAME> Centennial Money Market Trust
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JUN-30-1999
<PERIOD-START> JUL-01-1998
<PERIOD-END> DEC-31-1998
<INVESTMENTS-AT-COST> 16,753,835,511
<INVESTMENTS-AT-VALUE> 16,753,835,511
<RECEIVABLES> 249,605,422
<ASSETS-OTHER> 592,486
<OTHER-ITEMS-ASSETS> 15,206,689
<TOTAL-ASSETS> 17,019,240,108
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 152,370,668
<TOTAL-LIABILITIES> 152,370,668
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 16,866,792,998
<SHARES-COMMON-STOCK> 16,867,325,713
<SHARES-COMMON-PRIOR> 15,114,586,658
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 76,442
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 16,866,869,440
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 451,003,406
<OTHER-INCOME> 0
<EXPENSES-NET> 54,009,384
<NET-INVESTMENT-INCOME> 396,994,022
<REALIZED-GAINS-CURRENT> 12,825
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 397,006,847
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 397,034,748
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 23,194,541,848
<NUMBER-OF-SHARES-REDEEMED> 21,856,762,108
<SHARES-REINVESTED> 414,959,315
<NET-CHANGE-IN-ASSETS> 1,752,711,154
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 104,343
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 27,367,053
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 54,009,384
<AVERAGE-NET-ASSETS> 16,156,000,000
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.02
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> 0.02
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.66
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
