<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
This schedule contains summary information extracted from the consolidated
statements of operations and consolidated balance sheets of Mediacom
Communications Corporation and is qualified in its entirety by reference to such
financial statements.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<CASH> 3,024
<SECURITIES> 9,796
<RECEIVABLES> 5,044
<ALLOWANCES> 774
<INVENTORY> 13,759
<CURRENT-ASSETS> 0
<PP&E> 847,438
<DEPRECIATION> (185,054)
<TOTAL-ASSETS> 1,285,059
<CURRENT-LIABILITIES> 0
<BONDS> 0
0
0
<COMMON> 0
<OTHER-SE> 299,762
<TOTAL-LIABILITY-AND-EQUITY> 1,285,059
<SALES> 244,513
<TOTAL-REVENUES> 244,513
<CGS> 83,813
<TOTAL-COSTS> 286,360
<OTHER-EXPENSES> 1,224
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 51,444
<INCOME-PRETAX> (94,515)
<INCOME-TAX> 1,384
<INCOME-CONTINUING> (95,899)
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (95,899)
<EPS-BASIC> (1.17)
<EPS-DILUTED> (1.17)
</TABLE>