<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> 61
<NAME> LONG-TERM TREASURY - INVESTOR CLASS
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-END> MAR-31-2000
<INVESTMENTS-AT-COST> 83,064,767
<INVESTMENTS-AT-VALUE> 86,820,690
<RECEIVABLES> 3,902,416
<ASSETS-OTHER> 700
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 90,723,806
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 129,968
<TOTAL-LIABILITIES> 129,968
<SENIOR-EQUITY> 87,465
<PAID-IN-CAPITAL-COMMON> 94,953,070
<SHARES-COMMON-STOCK> 8,746,505
<SHARES-COMMON-PRIOR> 11,138,779
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (8,123,620)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3,755,923
<NET-ASSETS> 90,593,838
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 7,073,145
<OTHER-INCOME> 0
<EXPENSES-NET> 578,625
<NET-INVESTMENT-INCOME> 6,494,520
<REALIZED-GAINS-CURRENT> (7,299,656)
<APPREC-INCREASE-CURRENT> 1,905,647
<NET-CHANGE-FROM-OPS> 1,100,511
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (6,238,022)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 10,058,675
<NUMBER-OF-SHARES-REDEEMED> (15,489,080)
<SHARES-REINVESTED> 580,834
<NET-CHANGE-IN-ASSETS> (49,545,491)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (823,964)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 552,552
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 578,625
<AVERAGE-NET-ASSETS> 106,890,445
<PER-SHARE-NAV-BEGIN> 10.12
<PER-SHARE-NII> 0.57
<PER-SHARE-GAIN-APPREC> (0.30)
<PER-SHARE-DIVIDEND> (0.57)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.82
<EXPENSE-RATIO> 0.51
</TABLE>