<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS OF WORLDCOM, INC. AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 664
<SECURITIES> 0
<RECEIVABLES> 8,294
<ALLOWANCES> 1,285
<INVENTORY> 0
<CURRENT-ASSETS> 12,069
<PP&E> 38,916
<DEPRECIATION> (6,104)
<TOTAL-ASSETS> 97,373
<CURRENT-LIABILITIES> 14,048
<BONDS> 18,705
798
0
<COMMON> 29
<OTHER-SE> 54,173
<TOTAL-LIABILITY-AND-EQUITY> 97,373
<SALES> 0
<TOTAL-REVENUES> 20,171
<CGS> 8,244
<TOTAL-COSTS> 15,318
<OTHER-EXPENSES> (220)
<LOSS-PROVISION> 548
<INTEREST-EXPENSE> 454
<INCOME-PRETAX> 4,619
<INCOME-TAX> 1,883
<INCOME-CONTINUING> 2,592
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 2,559
<EPS-BASIC> 0.90
<EPS-DILUTED> 0.88
</TABLE>