<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000027825
<NAME> DELAWARE GROUP INCOME FUNDS
<SERIES>
<NUMBER> 012
<NAME> DELAWARE DELCHESTER FUND B CLASS
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> JUL-31-2000
<PERIOD-END> JUL-31-2000
<INVESTMENTS-AT-COST> 841,545,747
<INVESTMENTS-AT-VALUE> 738,513,315
<RECEIVABLES> 25,774,477
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> (5,303,044)
<TOTAL-ASSETS> 758,984,748
<PAYABLE-FOR-SECURITIES> 8,557,870
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,440,251
<TOTAL-LIABILITIES> 10,998,121
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,304,475,663
<SHARES-COMMON-STOCK> 47,554,638
<SHARES-COMMON-PRIOR> 63,186,875
<ACCUMULATED-NII-CURRENT> 1,045,764
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (454,404,804)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (103,128,996)
<NET-ASSETS> 208,784,191
<DIVIDEND-INCOME> 8,069,513
<INTEREST-INCOME> 110,069,147
<OTHER-INCOME> 0
<EXPENSES-NET> 15,026,514
<NET-INVESTMENT-INCOME> 103,112,146
<REALIZED-GAINS-CURRENT> (246,298,953)
<APPREC-INCREASE-CURRENT> 13,901,336
<NET-CHANGE-FROM-OPS> (129,285,471)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 27,139,509
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 8,825,817
<NUMBER-OF-SHARES-REDEEMED> 26,708,336
<SHARES-REINVESTED> 2,246,282
<NET-CHANGE-IN-ASSETS> (517,060,996)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6,209,644
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 15,372,878
<AVERAGE-NET-ASSETS> 277,358,288
<PER-SHARE-NAV-BEGIN> 5.540
<PER-SHARE-NII> 0.487
<PER-SHARE-GAIN-APPREC> (1.154)
<PER-SHARE-DIVIDEND> 0.483
<PER-SHARE-DISTRIBUTIONS> 0.000
<RETURNS-OF-CAPITAL> 0.000
<PER-SHARE-NAV-END> 4.390
<EXPENSE-RATIO> 2.000
</TABLE>
