<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000311635
<NAME> LORD ABBETT US GOV'T SEC. MONEY MARKET FUND
<SERIES>
<NUMBER> 003
<NAME> CLASS C
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> JUN-30-2000
<PERIOD-END> JUN-30-2000
<INVESTMENTS-AT-COST> 202,569,928
<INVESTMENTS-AT-VALUE> 202,569,928
<RECEIVABLES> 0
<ASSETS-OTHER> 275,911
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 202,845,839
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,112,837
<TOTAL-LIABILITIES> 1,112,837
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 201,733,002
<SHARES-COMMON-STOCK> 1,928,957
<SHARES-COMMON-PRIOR> 5,192,653
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 1,928,957
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 12,712,009
<OTHER-INCOME> 0
<EXPENSES-NET> 1,883,965
<NET-INVESTMENT-INCOME> 10,828,044
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 10,828,044
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (196,745)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 12,989,578
<NUMBER-OF-SHARES-REDEEMED> (16,409,786)
<SHARES-REINVESTED> 156,512
<NET-CHANGE-IN-ASSETS> 751,983
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,139,097
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,989,704
<AVERAGE-NET-ASSETS> 4,114,194
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.049
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (0.049)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.84
</TABLE>
