<ARTICLE> 5
<LEGEND>
This Schedule contains summary financial information extracted from MCI
WORLDCOM, Inc.'s financial statements for the six months ended June 30, 1999,
and is qualified in its entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                             599
<SECURITIES>                                         0
<RECEIVABLES>                                    6,713
<ALLOWANCES>                                       952
<INVENTORY>                                          0
<CURRENT-ASSETS>                                10,096
<PP&E>                                          27,744
<DEPRECIATION>                                 (3,180)
<TOTAL-ASSETS>                                  86,573
<CURRENT-LIABILITIES>                           16,839
<BONDS>                                         13,550
<PREFERRED-MANDATORY>                              798
<PREFERRED>                                          0
<COMMON>                                            19
<OTHER-SE>                                      48,230
<TOTAL-LIABILITY-AND-EQUITY>                    86,573
<SALES>                                              0
<TOTAL-REVENUES>                                17,945
<CGS>                                                0
<TOTAL-COSTS>                                   14,686
<OTHER-EXPENSES>                                  (16)
<LOSS-PROVISION>                                   447
<INTEREST-EXPENSE>                                 496
<INCOME-PRETAX>                                  2,779
<INCOME-TAX>                                     1,195
<INCOME-CONTINUING>                              1,584
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     1,572
<EPS-BASIC>                                       0.85
<EPS-DILUTED>                                     0.81