<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000102401
<NAME> USAA MUTUAL FUND, INC.
<SERIES>
<NUMBER> 9
<NAME> USAA S&P 500 INDEX FUND
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> JUN-30-2000
<INVESTMENTS-AT-COST> 0
<INVESTMENTS-AT-VALUE> 3,375,920
<RECEIVABLES> 27,448
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 3,403,368
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,296
<TOTAL-LIABILITIES> 1,296
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 2,564,805
<SHARES-COMMON-STOCK> 150,036
<SHARES-COMMON-PRIOR> 139,427
<ACCUMULATED-NII-CURRENT> 1,627
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 355,387
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 480,253
<NET-ASSETS> 3,402,072
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 0
<OTHER-INCOME> 18,934
<EXPENSES-NET> (1,923)
<NET-INVESTMENT-INCOME> 17,011
<REALIZED-GAINS-CURRENT> 357,403
<APPREC-INCREASE-CURRENT> (390,647)
<NET-CHANGE-FROM-OPS> (16,232)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (15,985)
<DISTRIBUTIONS-OF-GAINS> (1,583)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 43,001
<NUMBER-OF-SHARES-REDEEMED> (32,922)
<SHARES-REINVESTED> 531
<NET-CHANGE-IN-ASSETS> 205,589
<ACCUMULATED-NII-PRIOR> 601
<ACCUMULATED-GAINS-PRIOR> (434)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,923
<AVERAGE-NET-ASSETS> 3,237,185
<PER-SHARE-NAV-BEGIN> 22.92
<PER-SHARE-NII> 0.12
<PER-SHARE-GAIN-APPREC> (0.25)
<PER-SHARE-DIVIDEND> (0.11)
<PER-SHARE-DISTRIBUTIONS> (0.01)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 22.67
<EXPENSE-RATIO> 0.18
</TABLE>