<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE CONDENSED CONSOLIDATED BALANCE SHEET AND THE CONDENSED CONSOLIDATED STATEMENT OF INCOME FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1999, CONTAINED IN TRANSCONTINENTAL GAS PIPE LINE CORPORATION'S 1999 THIRD QUARTER REPORT ON FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-END> SEP-30-1999 <CASH> 1,924 <SECURITIES> 0 <RECEIVABLES> 6,139 <ALLOWANCES> 0 <INVENTORY> 74,798 <CURRENT-ASSETS> 715,319 <PP&E> 4,296,682 <DEPRECIATION> 667,720 <TOTAL-ASSETS> 4,558,924 <CURRENT-LIABILITIES> 435,216 <BONDS> 975,443 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 2,175,916 <TOTAL-LIABILITY-AND-EQUITY> 4,558,924 <SALES> 512,063 <TOTAL-REVENUES> 1,129,188 <CGS> 512,063 <TOTAL-COSTS> 810,918 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 52,209 <INCOME-PRETAX> 184,333 <INCOME-TAX> 70,458 <INCOME-CONTINUING> 113,875 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 113,875 <EPS-BASIC> 0 <EPS-DILUTED> 0