<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM THE SEMI-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> 33
<NAME> GOVERNMENT AGENCY MONEY MARKET FUND - ADVISOR CLASS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-END> SEP-30-2000
<INVESTMENTS-AT-COST> 556,459,981
<INVESTMENTS-AT-VALUE> 556,459,981
<RECEIVABLES> 24,679,622
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 581,139,603
<PAYABLE-FOR-SECURITIES> 17,000,000
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 529,920
<TOTAL-LIABILITIES> 17,529,920
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 563,606,384
<SHARES-COMMON-STOCK> 2,243,548
<SHARES-COMMON-PRIOR> 2,583,551
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3,299
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 563,609,683
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 17,837,045
<OTHER-INCOME> 0
<EXPENSES-NET> 1,325,517
<NET-INVESTMENT-INCOME> 16,511,528
<REALIZED-GAINS-CURRENT> 5,417
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 16,516,945
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (66,890)
<DISTRIBUTIONS-OF-GAINS> (7)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 892,951
<NUMBER-OF-SHARES-REDEEMED> (1,299,502)
<SHARES-REINVESTED> 66,548
<NET-CHANGE-IN-ASSETS> 5,651,787
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,310,432
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,325,517
<AVERAGE-NET-ASSETS> 2,359,752
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.03
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.03)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.72
</TABLE>
