<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, 7, AND
8 OF ITEM 2 OF PART I OF THE AMSOUTH BANCORPORATION FORM 10-Q FOR THE SIX MONTHS
ENDED JUNE 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>
<PERIOD-TYPE>                   6-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-2000             DEC-31-1999
<PERIOD-START>                             JAN-01-2000             JAN-01-1999
<PERIOD-END>                               JUN-30-2000             JUN-30-1999
<CASH>                                       1,538,506               1,528,722
<INT-BEARING-DEPOSITS>                               0                       0
<FED-FUNDS-SOLD>                                87,351                  83,852
<TRADING-ASSETS>                                34,090                  61,904
<INVESTMENTS-HELD-FOR-SALE>                  5,935,980               7,717,810
<INVESTMENTS-CARRYING>                       6,932,616               4,790,084
<INVESTMENTS-MARKET>                         6,726,831               4,705,424
<LOANS>                                     25,589,410              25,364,303
<ALLOWANCE>                                    358,064                 365,869
<TOTAL-ASSETS>                              42,584,032              42,103,322
<DEPOSITS>                                  27,898,918              27,542,406
<SHORT-TERM>                                 5,290,643               5,276,814
<LIABILITIES-OTHER>                            687,053                 591,416
<LONG-TERM>                                  5,886,467               5,500,565
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                       416,949                 421,124
<OTHER-SE>                                   2,404,002               2,770,997
<TOTAL-LIABILITIES-AND-EQUITY>              42,584,032              42,103,322
<INTEREST-LOAN>                              1,129,647               1,026,292
<INTEREST-INVEST>                              429,551                 368,552
<INTEREST-OTHER>                                 8,461                  13,556
<INTEREST-TOTAL>                             1,567,659               1,408,400
<INTEREST-DEPOSIT>                             502,788                 437,647
<INTEREST-EXPENSE>                             846,450                 662,062
<INTEREST-INCOME-NET>                          721,209                 746,338
<LOAN-LOSSES>                                   48,200                  37,323
<SECURITIES-GAINS>                               6,473                  11,059
<EXPENSE-OTHER>                                765,531                 707,739
<INCOME-PRETAX>                                346,940                 416,646
<INCOME-PRE-EXTRAORDINARY>                     346,940                 416,646
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   238,834                 268,377
<EPS-BASIC>                                        .61                     .68
<EPS-DILUTED>                                      .61                     .67
<YIELD-ACTUAL>                                    3.70                    4.15
<LOANS-NON>                                    119,082                 124,123
<LOANS-PAST>                                    70,800                  65,324
<LOANS-TROUBLED>                                     0                       0
<LOANS-PROBLEM>                                      0                       0
<ALLOWANCE-OPEN>                               363,476                 373,756
<CHARGE-OFFS>                                   74,848                  67,727
<RECOVERIES>                                    26,736                  22,517
<ALLOWANCE-CLOSE>                              358,064                 365,869
<ALLOWANCE-DOMESTIC>                                 0                       0
<ALLOWANCE-FOREIGN>                                  0                       0
<ALLOWANCE-UNALLOCATED>                              0                       0


</TABLE>