<ARTICLE>                                          9
<LEGEND>
This  Schedule  contains  summary  financial   information  extracted  from  BOK
Financial Corporation's 10-Q for the period ended June 30, 1998 and is qualified
in its entirety by reference to such financial statements.
</LEGEND>
<CIK>                          0000875357                            
<NAME>                         BOK Financial Corporation                      
<MULTIPLIER>                                   1,000
       
                             
<PERIOD-TYPE>                   6-mos
<FISCAL-YEAR-END>                              Dec-31-1998
<PERIOD-END>                                   Jun-30-1998
<CASH>                                           444,055
<INT-BEARING-DEPOSITS>                         2,977,030
<FED-FUNDS-SOLD>                                  29,025
<TRADING-ASSETS>                                  29,240
<INVESTMENTS-HELD-FOR-SALE>                    1,801,601
<INVESTMENTS-CARRYING>                           222,038
<INVESTMENTS-MARKET>                             222,159
<LOANS>                                        2,882,868
<ALLOWANCE>                                       57,782
<TOTAL-ASSETS>                                 5,704,512
<DEPOSITS>                                     3,914,192
<SHORT-TERM>                                     949,769
<LIABILITIES-OTHER>                               79,207
<LONG-TERM>                                      296,074
<PREFERRED-MANDATORY>                                  0
<PREFERRED>                                           23
<COMMON>                                               1
<OTHER-SE>                                       465,246
<TOTAL-LIABILITIES-AND-EQUITY>                 5,704,512
<INTEREST-LOAN>                                  123,549
<INTEREST-INVEST>                                 60,367
<INTEREST-OTHER>                                   1,687
<INTEREST-TOTAL>                                 185,603
<INTEREST-DEPOSIT>                                66,908
<INTEREST-EXPENSE>                                99,103
<INTEREST-INCOME-NET>                             86,500
<LOAN-LOSSES>                                      6,423
<SECURITIES-GAINS>                                 5,832
<EXPENSE-OTHER>                                  110,997
<INCOME-PRETAX>                                   54,222
<INCOME-PRE-EXTRAORDINARY>                        36,751
<EXTRAORDINARY>                                        0
<CHANGES>                                              0
<NET-INCOME>                                      36,751
<EPS-PRIMARY>                                       1.64
<EPS-DILUTED>                                       1.46
<YIELD-ACTUAL>                                      3.63
<LOANS-NON>                                       14,735
<LOANS-PAST>                                      21,568
<LOANS-TROUBLED>                                       0
<LOANS-PROBLEM>                                   76,000
<ALLOWANCE-OPEN>                                  53,101
<CHARGE-OFFS>                                      3,822
<RECOVERIES>                                       2,080
<ALLOWANCE-CLOSE>                                 57,782
<ALLOWANCE-DOMESTIC>                              57,782
<ALLOWANCE-FOREIGN>                                    0
<ALLOWANCE-UNALLOCATED>                                0