<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> 13
<NAME> GNMA FUND ADVISOR CLASS
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-END> MAR-31-2000
<INVESTMENTS-AT-COST> 1,277,533,108
<INVESTMENTS-AT-VALUE> 1,245,036,533
<RECEIVABLES> 94,359,426
<ASSETS-OTHER> 74,221
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,339,470,180
<PAYABLE-FOR-SECURITIES> 85,598,779
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 788,000
<TOTAL-LIABILITIES> 86,386,779
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,319,762,011
<SHARES-COMMON-STOCK> 1,287,153
<SHARES-COMMON-PRIOR> 650,709
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (34,182,035)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (32,496,575)
<NET-ASSETS> 1,253,083,401
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 94,613,014
<OTHER-INCOME> 0
<EXPENSES-NET> 7,974,367
<NET-INVESTMENT-INCOME> 86,638,647
<REALIZED-GAINS-CURRENT> (12,625,280)
<APPREC-INCREASE-CURRENT> (49,501,818)
<NET-CHANGE-FROM-OPS> 24,511,549
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (595,306)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,487,980
<NUMBER-OF-SHARES-REDEEMED> (902,081)
<SHARES-REINVESTED> 50,545
<NET-CHANGE-IN-ASSETS> (169,433,320)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (21,556,755)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 7,887,121
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 7,974,367
<AVERAGE-NET-ASSETS> 9,569,799
<PER-SHARE-NAV-BEGIN> 10.62
<PER-SHARE-NII> 0.64
<PER-SHARE-GAIN-APPREC> (0.46)
<PER-SHARE-DIVIDEND> (0.64)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.16
<EXPENSE-RATIO> 0.84
</TABLE>
