<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM THE CONSOLIDATED
STATEMENTS OF OPERATIONS AND CONSOLIDATED BALANCE SHEETS OF MEDIACOM LLC AND
SUBSIDIARIES AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<CIK>   0001064116
<NAME>  MEDIACOM LLC
<MULTIPLIER>  1,000
       
                                                                       
<PERIOD-TYPE>                   12-MOS                   12-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996             DEC-31-1998
<PERIOD-START>                             JAN-01-1997             MAR-12-1996             JAN-01-1998
<PERIOD-END>                               DEC-31-1997             DEC-31-1996             MAR-31-1998
<CASH>                                            1027                     396                    1495
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                      674                     292                    4447
<ALLOWANCES>                                        56                      25                     373
<INVENTORY>                                       1032                     327                    1293
<CURRENT-ASSETS>                                     0                       0                       0
<PP&E>                                           51735                   18993                  190519
<DEPRECIATION>                                  (5737)                  (1056)                 (11397)
<TOTAL-ASSETS>                                  102791                   46560                  444963
<CURRENT-LIABILITIES>                                0                       0                       0
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<OTHER-SE>                                       24441                    4537                  108466
<TOTAL-LIABILITY-AND-EQUITY>                    102791                   46560                  444963
<SALES>                                          17634                    5411                   25943
<TOTAL-REVENUES>                                 17634                    5411                   25943
<CGS>                                             5547                    1511                    9822
<TOTAL-COSTS>                                    16761                    4869                   27561
<OTHER-EXPENSES>                                   640                     967                    3340
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                4829                    1528                    5017
<INCOME-PRETAX>                                 (4596)                  (1953)                  (9975)
<INCOME-TAX>                                         0                       0                       0
<INCOME-CONTINUING>                             (4596)                  (1953)                  (9975)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                    (4596)                  (1953)                  (9975)
<EPS-PRIMARY>                                        0                       0                       0
<EPS-DILUTED>                                        0                       0                       0