<TABLE> <S> <C>

<PAGE>

<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED STATEMENT OF CONDITION, THE CONSOLIDATED STATEMENT OF EARNINGS, THE
CONSOLIDATED STATEMENT OF CASH FLOWS OF ITEM 1 OF PART I AND TABLES 2, 6, AND 7
OF ITEM 2 OF PART I OF THE AMSOUTH BANCORPORTION FORM 10-Q FOR THE SIX MONTHS
ENDED JUNE 30, 1999.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                         556,646
<INT-BEARING-DEPOSITS>                               0
<FED-FUNDS-SOLD>                                19,050
<TRADING-ASSETS>                                 6,071
<INVESTMENTS-HELD-FOR-SALE>                  3,474,272
<INVESTMENTS-CARRYING>                       2,215,267
<INVESTMENTS-MARKET>                         2,179,937
<LOANS>                                     13,084,345
<ALLOWANCE>                                    177,082
<TOTAL-ASSETS>                              20,592,018
<DEPOSITS>                                  13,076,507
<SHORT-TERM>                                 1,975,355
<LIABILITIES-OTHER>                            401,953
<LONG-TERM>                                  3,713,950
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       202,415
<OTHER-SE>                                   1,221,838
<TOTAL-LIABILITIES-AND-EQUITY>              20,592,018
<INTEREST-LOAN>                                550,797
<INTEREST-INVEST>                              168,380
<INTEREST-OTHER>                                 3,399
<INTEREST-TOTAL>                               722,576
<INTEREST-DEPOSIT>                             220,370
<INTEREST-EXPENSE>                             352,501
<INTEREST-INCOME-NET>                          370,075
<LOAN-LOSSES>                                   17,000
<SECURITIES-GAINS>                               6,495
<EXPENSE-OTHER>                                306,743
<INCOME-PRETAX>                                223,526
<INCOME-PRE-EXTRAORDINARY>                           0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   144,579
<EPS-BASIC>                                        .82
<EPS-DILUTED>                                      .81
<YIELD-ACTUAL>                                    4.09
<LOANS-NON>                                     82,334
<LOANS-PAST>                                    24,133
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                                      0
<ALLOWANCE-OPEN>                               176,075
<CHARGE-OFFS>                                   25,642
<RECOVERIES>                                     9,649
<ALLOWANCE-CLOSE>                              177,082
<ALLOWANCE-DOMESTIC>                                 0
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                              0


</TABLE>