<TABLE> <S> <C>
<ARTICLE> 9
<CIK> 0000064782
<NAME> MELLON FINANCIAL CORPORATION
<MULTIPLIER> 1,000,000
<CURRENCY> U.S. DOLLARS
<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
<CASH> 3,580
<INT-BEARING-DEPOSITS> 1,022
<FED-FUNDS-SOLD> 290
<TRADING-ASSETS> 151
<INVESTMENTS-HELD-FOR-SALE> 5,160
<INVESTMENTS-CARRYING> 1,110
<INVESTMENTS-MARKET> 1,094
<LOANS> 27,667
<ALLOWANCE> 401
<TOTAL-ASSETS> 46,029
<DEPOSITS> 32,618
<SHORT-TERM> 2,456
<LIABILITIES-OTHER> 2,563
<LONG-TERM> 3,537
991<F1>
0
<COMMON> 294
<OTHER-SE> 3,570
<TOTAL-LIABILITIES-AND-EQUITY> 46,029<F1>
<INTEREST-LOAN> 1,128
<INTEREST-INVEST> 207
<INTEREST-OTHER> 57
<INTEREST-TOTAL> 1,400
<INTEREST-DEPOSIT> 477
<INTEREST-EXPENSE> 701
<INTEREST-INCOME-NET> 699
<LOAN-LOSSES> 20
<SECURITIES-GAINS> 0
<EXPENSE-OTHER> 1,462
<INCOME-PRETAX> 788
<INCOME-PRE-EXTRAORDINARY> 500
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 500
<EPS-BASIC> 1.01
<EPS-DILUTED> 1.00
<YIELD-ACTUAL> 3.78
<LOANS-NON> 207
<LOANS-PAST> 112
<LOANS-TROUBLED> 0
<LOANS-PROBLEM> 0
<ALLOWANCE-OPEN> 403
<CHARGE-OFFS> 40
<RECOVERIES> 18
<ALLOWANCE-CLOSE> 401
<ALLOWANCE-DOMESTIC> 0
<ALLOWANCE-FOREIGN> 0
<ALLOWANCE-UNALLOCATED> 0
<FN>
<F1>Includes $991 million of guaranteed preferred beneficial interests in the
Corporation's junior subordinated deferrable interest debentures.
</FN>
</TABLE>