<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from NorthPoint
Communications Group, Inc.'s September 30, 2000 financial statements and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JUL-01-2000
<PERIOD-END> SEP-30-2000
<CASH> 52,690
<SECURITIES> 97,636
<RECEIVABLES> 27,778
<ALLOWANCES> 12,864
<INVENTORY> 7,574
<CURRENT-ASSETS> 231,112
<PP&E> 526,601
<DEPRECIATION> 71,628
<TOTAL-ASSETS> 738,211
<CURRENT-LIABILITIES> 92,107
<BONDS> 0
0
0
<COMMON> 133
<OTHER-SE> 145,497
<TOTAL-LIABILITY-AND-EQUITY> 738,211
<SALES> 23,955
<TOTAL-REVENUES> 23,955
<CGS> 48,925
<TOTAL-COSTS> 48,925
<OTHER-EXPENSES> 93,124
<LOSS-PROVISION> 2,473
<INTEREST-EXPENSE> 17,121
<INCOME-PRETAX> 0
<INCOME-TAX> 40
<INCOME-CONTINUING> (136,317)
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (136,317)
<EPS-BASIC> (1.03)
<EPS-DILUTED> (1.03)
</TABLE>