<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE ANNUAL REPORT OF AMERICAN CENTURY GOVERNMENT INCOME TRUST
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
<NUMBER> 31
<NAME> GOVERNMENT AGENCY MONEY MARKET FUND - INVESTOR CLASS
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-END> MAR-31-2000
<INVESTMENTS-AT-COST> 550,743,645
<INVESTMENTS-AT-VALUE> 550,743,645
<RECEIVABLES> 3,429,632
<ASSETS-OTHER> 4,007,982
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 558,181,259
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 223,363
<TOTAL-LIABILITIES> 223,363
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 557,958,274
<SHARES-COMMON-STOCK> 555,374,723
<SHARES-COMMON-PRIOR> 531,389,539
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (378)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 557,957,896
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 28,592,975
<OTHER-INCOME> 0
<EXPENSES-NET> 2,543,385
<NET-INVESTMENT-INCOME> 26,049,590
<REALIZED-GAINS-CURRENT> (378)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 26,049,212
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (25,960,326)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 430,818,658
<NUMBER-OF-SHARES-REDEEMED> (428,250,112)
<SHARES-REINVESTED> 24,964,176
<NET-CHANGE-IN-ASSETS> 30,115,895
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2,519,259
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,543,385
<AVERAGE-NET-ASSETS> 532,197,791
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.05)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.48
</TABLE>
