<ARTICLE> 9 <CIK> 0000726990 <NAME> UNITED SECURITY BANCORPORATION <MULTIPLIER> 1000 <CURRENCY> US DOLLARS <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-1999 <PERIOD-END> SEP-30-1999 <EXCHANGE-RATE> 1.000 <CASH> 20704 <INT-BEARING-DEPOSITS> 11344 <FED-FUNDS-SOLD> 0 <TRADING-ASSETS> 0 <INVESTMENTS-HELD-FOR-SALE> 53649 <INVESTMENTS-CARRYING> 748 <INVESTMENTS-MARKET> 751 <LOANS> 415078 <ALLOWANCE> 4217 <TOTAL-ASSETS> 527627 <DEPOSITS> 450515 <SHORT-TERM> 11075 <LIABILITIES-OTHER> 4153 <LONG-TERM> 696 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 44447 <OTHER-SE> 16741 <TOTAL-LIABILITIES-AND-EQUITY> 527627 <INTEREST-LOAN> 29289 <INTEREST-INVEST> 2870 <INTEREST-OTHER> 380 <INTEREST-TOTAL> 32539 <INTEREST-DEPOSIT> 11039 <INTEREST-EXPENSE> 11364 <INTEREST-INCOME-NET> 21175 <LOAN-LOSSES> 1066 <SECURITIES-GAINS> 66 <EXPENSE-OTHER> 14358 <INCOME-PRETAX> 10657 <INCOME-PRE-EXTRAORDINARY> 10657 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 7645 <EPS-BASIC> 1.10 <EPS-DILUTED> 1.09 <YIELD-ACTUAL> 6.16 <LOANS-NON> 1913 <LOANS-PAST> 346 <LOANS-TROUBLED> 0 <LOANS-PROBLEM> 0 <ALLOWANCE-OPEN> 3819 <CHARGE-OFFS> 853 <RECOVERIES> 185 <ALLOWANCE-CLOSE> 4217 <ALLOWANCE-DOMESTIC> 4217 <ALLOWANCE-FOREIGN> 0 <ALLOWANCE-UNALLOCATED> 0