<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<CIK> 0001053112
<NAME> CABLEVISION SYSTEMS CORPORATION
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> SEP-30-2000
<CASH> 38,557
<SECURITIES> 0
<RECEIVABLES> 309,557
<ALLOWANCES> (42,936)
<INVENTORY> 318,551
<CURRENT-ASSETS> 0
<PP&E> 5,296,138
<DEPRECIATION> (2,249,244)
<TOTAL-ASSETS> 7,749,308
<CURRENT-LIABILITIES> 0
<BONDS> 6,990,700
0
0
<COMMON> 1,745
<OTHER-SE> (3,371,008)
<TOTAL-LIABILITY-AND-EQUITY> 7,749,308
<SALES> 0
<TOTAL-REVENUES> 3,191,046
<CGS> 383,860
<TOTAL-COSTS> 1,199,695
<OTHER-EXPENSES> 709,333
<LOSS-PROVISION> (25,697)
<INTEREST-EXPENSE> 421,740
<INCOME-PRETAX> (327,385)
<INCOME-TAX> 0
<INCOME-CONTINUING> (327,385)
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (327,385)
<EPS-BASIC> (1.89)
<EPS-DILUTED> 0<F1>
<FN>
<F1>Not presented as the resultant computation would be a decrease in net loss per
share and therefore not meaningful.
</FN>
</TABLE>