<TABLE> <S> <C>
<ARTICLE> 6
<RESTATED>
<CIK> 0000106444
<NAME> VANGUARD FIXED INCOME SECURITIES FUNDS
<SERIES>
<NUMBER> 05
<NAME> VANGUARD LONG-TERM TREASURY FUND
<MULTIPLIER> 1,000
<CURRENCY> US
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JAN-31-2001
<PERIOD-START> FEB-01-2000
<PERIOD-END> JUL-31-2000
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 1143000
<INVESTMENTS-AT-VALUE> 1194892
<RECEIVABLES> 29794
<ASSETS-OTHER> 221
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1224907
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<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 42911
<TOTAL-LIABILITIES> 42911
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1150271
<SHARES-COMMON-STOCK> 114720
<SHARES-COMMON-PRIOR> 120956
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (20167)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 51892
<NET-ASSETS> 1181996
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 37217
<OTHER-INCOME> 125
<EXPENSES-NET> 1828
<NET-INVESTMENT-INCOME> 35514
<REALIZED-GAINS-CURRENT> (1729)
<APPREC-INCREASE-CURRENT> 67945
<NET-CHANGE-FROM-OPS> 101730
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 35514
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 12638
<NUMBER-OF-SHARES-REDEEMED> 21698
<SHARES-REINVESTED> 2825
<NET-CHANGE-IN-ASSETS> 3916
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (18438)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 71
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1828
<AVERAGE-NET-ASSETS> 1167276
<PER-SHARE-NAV-BEGIN> 9.74
<PER-SHARE-NII> .309
<PER-SHARE-GAIN-APPREC> .560
<PER-SHARE-DIVIDEND> .309
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.30
<EXPENSE-RATIO> 0.32
</TABLE>
