<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM SOUTHWEST
BANCORP'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED SEPTEMBER 30,
1998, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                          23,169
<INT-BEARING-DEPOSITS>                           1,851
<FED-FUNDS-SOLD>                                     0
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                     89,219
<INVESTMENTS-CARRYING>                          81,479
<INVESTMENTS-MARKET>                            82,918
<LOANS>                                        755,056
<ALLOWANCE>                                      9,709
<TOTAL-ASSETS>                                 977,787
<DEPOSITS>                                     830,811
<SHORT-TERM>                                    57,114
<LIABILITIES-OTHER>                              8,373
<LONG-TERM>                                     25,013
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         3,797
<OTHER-SE>                                      52,679
<TOTAL-LIABILITIES-AND-EQUITY>                 977,787
<INTEREST-LOAN>                                 51,886
<INTEREST-INVEST>                                8,588
<INTEREST-OTHER>                                    56
<INTEREST-TOTAL>                                60,530
<INTEREST-DEPOSIT>                              28,067
<INTEREST-EXPENSE>                              31,856
<INTEREST-INCOME-NET>                           28,674
<LOAN-LOSSES>                                    2,705
<SECURITIES-GAINS>                                 185
<EXPENSE-OTHER>                                 19,942
<INCOME-PRETAX>                                 11,167
<INCOME-PRE-EXTRAORDINARY>                      11,167
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     7,163
<EPS-PRIMARY>                                     1.61
<EPS-DILUTED>                                     1.56
<YIELD-ACTUAL>                                    8.61
<LOANS-NON>                                      1,055
<LOANS-PAST>                                       376
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                                 23,963
<ALLOWANCE-OPEN>                                 8,282
<CHARGE-OFFS>                                    2,009
<RECOVERIES>                                       731
<ALLOWANCE-CLOSE>                                9,709
<ALLOWANCE-DOMESTIC>                             9,709
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                          2,282