<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS OF ONEOK, INC. FOR THE PERIOD ENDED NOVEMBER 30, 1999, AND
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1000

                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          SEP-01-1999
<PERIOD-START>                             AUG-31-2000
<PERIOD-END>                               NOV-30-1999
<CASH>                                               0
<SECURITIES>                                         0
<RECEIVABLES>                                  284,055
<ALLOWANCES>                                         0
<INVENTORY>                                    155,905
<CURRENT-ASSETS>                               541,131
<PP&E>                                       3,119,425
<DEPRECIATION>                               1,015,845
<TOTAL-ASSETS>                               3,174,887
<CURRENT-LIABILITIES>                          691,423
<BONDS>                                        809,428
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                        199
<COMMON>                                           316
<OTHER-SE>                                   1,147,012
<TOTAL-LIABILITY-AND-EQUITY>                 3,174,887
<SALES>                                        533,482
<TOTAL-REVENUES>                               533,482
<CGS>                                          338,994
<TOTAL-COSTS>                                  338,994
<OTHER-EXPENSES>                               148,411
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              20,357
<INCOME-PRETAX>                                 25,720
<INCOME-TAX>                                     9,990
<INCOME-CONTINUING>                             15,730
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    15,730
<EPS-BASIC>                                       0.21
<EPS-DILUTED>                                     0.21