WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
Putnam Money Market Fund
</LEGEND>
<SERIES>
<NUMBER> 4
<NAME> Class A
<S> <C>
<PERIOD-TYPE> ANNUAL
<FISCAL-YEAR-END> SEP-30-2000
<PERIOD-END> SEP-30-2000
<INVESTMENTS-AT-COST> 4,470,091,583
<INVESTMENTS-AT-VALUE> 4,470,091,583
<RECEIVABLES> 179,641,583
<ASSETS-OTHER> 292,874
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 4,650,026,040
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 52,560,522
<TOTAL-LIABILITIES> 52,560,522
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 4,597,465,518
<SHARES-COMMON-STOCK> 3,780,309,233
<SHARES-COMMON-PRIOR> 3,691,475,399
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 4,597,465,518
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 280,714,304
<OTHER-INCOME> 0
<EXPENSES-NET> 25,222,715
<NET-INVESTMENT-INCOME> 255,491,589
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 255,491,589
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (205,971,249)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 13,559,891,513
<NUMBER-OF-SHARES-REDEEMED> (13,666,419,670)
<SHARES-REINVESTED> 195,361,991
<NET-CHANGE-IN-ASSETS> (288,687,405)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 14,348,517
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 26,586,464
<AVERAGE-NET-ASSETS> 3,628,006,490
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> .06
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (.06)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> .49
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
