<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 June 30, 1998 and is qualified in its entirety by reference to such financial statements. </LEGEND> <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-START> JAN-01-1998 <PERIOD-END> JUN-30-1998 <CASH> 56,578 <INT-BEARING-DEPOSITS> 19,865 <FED-FUNDS-SOLD> 22,900 <TRADING-ASSETS> 0 <INVESTMENTS-HELD-FOR-SALE> 566,945 <INVESTMENTS-CARRYING> 233,767 <INVESTMENTS-MARKET> 234,404 <LOANS> 870,145 <ALLOWANCE> 23,482 <TOTAL-ASSETS> 1,841,662 <DEPOSITS> 1,326,895 <SHORT-TERM> 333,728 <LIABILITIES-OTHER> 47,188 <LONG-TERM> 2,314 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 71 <OTHER-SE> 131,466 <TOTAL-LIABILITIES-AND-EQUITY> 1,841,662 <INTEREST-LOAN> 36,029 <INTEREST-INVEST> 24,107 <INTEREST-OTHER> 1,091 <INTEREST-TOTAL> 61,227 <INTEREST-DEPOSIT> 21,569 <INTEREST-EXPENSE> 30,591 <INTEREST-INCOME-NET> 30,636 <LOAN-LOSSES> 503 <SECURITIES-GAINS> 2 <EXPENSE-OTHER> 25,249 <INCOME-PRETAX> 13,389 <INCOME-PRE-EXTRAORDINARY> 13,389 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 8,301 <EPS-PRIMARY> 1.24 <EPS-DILUTED> 1.17 <YIELD-ACTUAL> 7.38 <LOANS-NON> 3,598 <LOANS-PAST> 109 <LOANS-TROUBLED> 433 <LOANS-PROBLEM> 17,658 <ALLOWANCE-OPEN> 22,724 <CHARGE-OFFS> 717 <RECOVERIES> 972 <ALLOWANCE-CLOSE> 23,482 <ALLOWANCE-DOMESTIC> 23,482 <ALLOWANCE-FOREIGN> 0 <ALLOWANCE-UNALLOCATED> 0