<TABLE> <S> <C>

<ARTICLE> 9
<LEGEND>
This  schedule  contains  summary  financial   information  extracted  from  the
unaudited financial statements of SIS Bancorp,  Inc. at and for the period ended
March 31, 1997 and is qualified  in its entirety by reference to such  financial
statements.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                          42,524
<INT-BEARING-DEPOSITS>                           3,656
<FED-FUNDS-SOLD>                                18,000
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                    480,070
<INVESTMENTS-CARRYING>                         188,614
<INVESTMENTS-MARKET>                           185,962
<LOANS>                                        616,447
<ALLOWANCE>                                     16,287
<TOTAL-ASSETS>                               1,403,745
<DEPOSITS>                                   1,006,873
<SHORT-TERM>                                   259,263
<LIABILITIES-OTHER>                             33,441
<LONG-TERM>                                      2,848
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            57
<OTHER-SE>                                     101,263
<TOTAL-LIABILITIES-AND-EQUITY>               1,403,745
<INTEREST-LOAN>                                 12,984
<INTEREST-INVEST>                               11,151
<INTEREST-OTHER>                                   229
<INTEREST-TOTAL>                                24,364
<INTEREST-DEPOSIT>                               8,337
<INTEREST-EXPENSE>                              11,871
<INTEREST-INCOME-NET>                           12,493
<LOAN-LOSSES>                                      401
<SECURITIES-GAINS>                                   0
<EXPENSE-OTHER>                                  3,673
<INCOME-PRETAX>                                  4,541
<INCOME-PRE-EXTRAORDINARY>                       4,541
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     2,770
<EPS-PRIMARY>                                      .50
<EPS-DILUTED>                                      .50
<YIELD-ACTUAL>                                    7.51
<LOANS-NON>                                      4,545
<LOANS-PAST>                                     1,315
<LOANS-TROUBLED>                                   197
<LOANS-PROBLEM>                                      0
<ALLOWANCE-OPEN>                                15,597
<CHARGE-OFFS>                                      190
<RECOVERIES>                                       479
<ALLOWANCE-CLOSE>                               16,287
<ALLOWANCE-DOMESTIC>                            16,287
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                              0
        

</TABLE>