<TABLE> <S> <C>
<ARTICLE> 6
<RESTATED>
<CIK> 0000794105
<NAME> VANGUARD BOND INDEX FUNDS
<SERIES>
<NUMBER> 012
<NAME> VANGUARD TOTAL BOND INDEX FUND INSTITUTIONAL SHARES
<MULTIPLIER> 1,000
<CURRENCY> US
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 14050641
<INVESTMENTS-AT-VALUE> 13711758
<RECEIVABLES> 296722
<ASSETS-OTHER> 1911
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 14010391
<PAYABLE-FOR-SECURITIES> 199393
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 205267
<TOTAL-LIABILITIES> 404660
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 14036896
<SHARES-COMMON-STOCK> 375832
<SHARES-COMMON-PRIOR> 335065
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (92282)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (338883)
<NET-ASSETS> 3611020
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 450839
<OTHER-INCOME> 145
<EXPENSES-NET> 12311
<NET-INVESTMENT-INCOME> 438673
<REALIZED-GAINS-CURRENT> (28491)
<APPREC-INCREASE-CURRENT> 92124
<NET-CHANGE-FROM-OPS> 502306
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 115587
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 64769
<NUMBER-OF-SHARES-REDEEMED> 34392
<SHARES-REINVESTED> 10390
<NET-CHANGE-IN-ASSETS> 924095
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (63791)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 782
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 12326
<AVERAGE-NET-ASSETS> 3403930
<PER-SHARE-NAV-BEGIN> 9.56
<PER-SHARE-NII> .325
<PER-SHARE-GAIN-APPREC> .050
<PER-SHARE-DIVIDEND> .325
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.61
<EXPENSE-RATIO> 0.10
</TABLE>
