Top 23 U.S. ISPs by Subscriber – AT&T, Comcast, Road Runner

Here is a compiled list of the Top 23 U.S. ISPs by Subscriber.

Rank
ISP
Subs.
(millions)
Date & Source
Market
Share
1
SBC (AT&T) (business and consumer DSL, U-Verse, and satellite—ISDN not disclosed)
14.8
[October 22, 2008]
Press Release [.xls]
15.4%
2
Comcast (cable broadband)
14.7
[October 29, 2008]
SEC 10-Q
15.3%
3
Road Runner (cable broadband, both business and residential)
8.6
[November 5, 2008]
Trending Schedules
9.0%
4
Verizon (FiOS and DSL)
8.5
[October 27, 2008]
Press Release [.xls]
8.8%
5
America Online (all U.S. AOL brand accounts)
7.5
[November 5, 2008]
Trending Schedules
7.7%
6
EarthLink (DSL, dialup, cable, satellite, PLC, and webhosting—some other business lines not included)
3.0
[October 31, 2008]
SEC 10-Q
3.1%
7
Charter (cable broadband)
2.9
[November 6, 2008]
SEC 10-Q
3.0%
8
Qwest (DSL only)
2.8
[October 29, 2008]
Press Release [.xls]
2.9%
9
Cablevision (cable broadband)
2.4
[November 6, 2008]
SEC 10-Q
2.5%
10
United Online (counting paid access only)
1.5
[November 10, 2008]
SEC 10-Q
1.5%
11
Embarq (DSL only, formerly part of Sprint)
1.4
[October 30, 2008]
SEC 10-Q
1.4%
12
Windstream (DSL only, formerly ALLTEL and Valor)
.96
[November 7, 2008]
SEC 10-Q
1.0%
13
Mediacom (cable broadband, dialup, and SMB broadband)
.73
[November 7, 2008]
SEC 10-Q
0.8%
14
CenturyTel (DSL only, no dialup)
.63
[October 27, 2008]
Press Release
0.7%
15
Citizens (DSL only)
.57
[November 10, 2008]
Press Release
0.6%
16
Hughes Network Systems (satellite broadband)
.42
[November 5, 2008]
SEC 10-Q
0.4%
17
Insight Broadband (cable broadband)
.42
[November 10, 2008]
Press Release [.pdf]
0.4%
18
Clearwire (fixed wireless broadband)
.42
[November 10, 2008]
SEC 10-Q
0.4%
19
LocalNet (dialup)
.26
ISP-Planet article (reconfirmed by e-mail on June 16, 2008)
0.3%
20
Cincinnati Bell (DSL only)
.23
[October 31, 2008]
SEC 10-Q
0.2%
21
SureWest (broadband)
.10
[November 7, 2008]
SEC 10-Q

0.1%
22
GCI (cable broadband)
.10
[November 5, 2008]
Press Release (late SEC filing) [.pdf]
0.1%
23
ACS (DSL and dialup)
.055
[October 30, 2008]
Press Release [.pdf]
0.1%
24
Other U.S. ISPs
23.2
24.1%

Source

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