In Cos Cob there are 8 residential internet providers covering 99.71% of the city. The average home can get speeds up to 7,912 Mbps. Note that we may have a financial relationship with some of the providers below. This does not influence rankings, and helps us provide high-quality detailed information for free.
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8 Internet Service Providers in Cos Cob
Data updated 11/14/2025, based on FCC data from 12/31/2024. This is the most current data available as of .
To avoid wasting your time, providers with less than 1% coverage in Cos Cob are not shown.
Cos Cob Satellite TV & Internet Providers
DISH Satellite TV
DIRECTV Satellite TV
Not sure whether to choose Dish or DIRECTV? For most people most of the time we recommend DISH. But click here to learn more.
Viasat Satellite Internet
Availability maps for all providers in Cos Cob
Using the dropdown below, please select a provider. Green indicates nearly all homes have service, red indicates few homes have service, and blank indicates no service.
Please note some providers will take longer to load than others
Internet service is available in 99.71% of Cos Cob. Using our interactive availability map, you can compare service areas for different providers, we include fiber, cable, DSL, or fixed wireless internet service for all providers who offer it. You will notice that some providers might be listed multiple times for each service. If you find no providers cover the location you're looking at, you can opt for satellite service. The most widely available provider is Optimum. Now you can call companies in Cos Cob with more confidence that they might be available.
How fast are internet speeds in Cos Cob?
The map below shows maximum internet speeds by area in Cos Cob.
Internet Speed Key
The average Cos Cob home can get up to 7,912 Mbps on their internet plan. For most people, the fastest download speed in the city is 8,000 Mbps, which 98.47% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 1.24% of homes can only purchase plans up to 940 Mbps. See the internet provider details below for info about their speed and coverage in Cos Cob.
Internet speeds tend to be faster in the northeast parts of Cos Cob, and slower in the south areas of the city.
What type of internet should I choose in Cos Cob?
The fastest internet for you may vary based on where in Cos Cob you live. If speed is your main concern, fiber will be the fastest internet in the city.
- Fiber is the fastest internet type for 99.71% of Cos Cob homes.
- Cable is fastest for less than 1% of the city.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for less than 1%.
- Satellite internet may be the only option for less than 1% of Cos Cob homes.
Internet Market Health in Cos Cob
Internet Competition Key
The map shows how competitive the Cos Cob internet service market is. Areas in green have more alternatives, areas in yellow have a few choices, and areas in red may have only one provider. More competition usually means faster speeds and better prices for you, the customer.
Below are quick facts on internet competition and market health in Cos Cob based on what connections the average home has availabile:
- Average number of internet service providers to a home: 5.9 (healthy)
- Average types of service (fiber, cable, DSL, etc): 2.8 (healthy)
- Average providers with broadband (25 Mbps+) speeds: 5.9 (very healthy)
Overall, competition is healthy.
Cos Cob internet customers have the ability to buy internet service from 2 to 8 different providers, depending on where they live. For different types of service, Cos Cob homes have between 2 and 3 options. The type(s) of service available are fiber, cable, and fixed wireless, though these may vary depending on the region within the city.
When it comes to broadband download speeds faster than 25 Mbps, the situation is similar. Cos Cob internet customers who want faster speeds have between 2 and 8 choices of companies offering speeds up to or over 25 Mbps.
More internet companies with faster speeds means fewer monopolies and better prices for customers. In promoting a free market for internet, Cos Cob is doing better than most.
TV & Internet Providers in Depth
Below you'll find which TV and internet providers offer service in Cos Cob, along with details on where in Cos Cob and at what speeds.
Optimum Cable in Cos Cob, CT
Optimum cable coverage
About 99.71%, or 8,026 people, have Optimum cable internet available to them in the city. The company covers the entire Cos Cob area. Optimum is one of the largest internet service providers internet service providers in the US, with internet service available in most of Cos Cob.
Optimum cable download speeds
Optimum is below average when comparing download speeds to all other internet providers in Cos Cob. Versus other cable providers in the area, Optimum cable is the fastest. There are no different maximum speeds throughout Cos Cob. The fastest plan anyone in Cos Cob can order from Optimum goes up to 940 Mbps, and all Cos Cob customers can get this speed.
Show all download speeds
- 100.0% up to 940.0 Mbps
Optimum cable upload speeds
In Cos Cob download speeds tend to be faster than than upload speeds for Optimum cable. Compared to other ISPs, Optimum is below average where upload speeds are concerned, and the fastest compared to other Cos Cob cable providers. Optimum offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Cos Cob is up to 35 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 35.0 Mbps
Optimum Fiber in Cos Cob, CT
Optimum fiber coverage
About 98.47%, or 7,926 people, have Optimum fiber internet available to them in the city. The company covers the entire Cos Cob area. Optimum is one of the largest internet service providers internet service providers in the US, with internet service available in most of Cos Cob.
Optimum fiber download speeds
Optimum is the fastest when comparing download speeds to all other internet providers in Cos Cob. Versus other fiber providers in the area, Optimum fiber is the fastest. There are no different maximum speeds throughout Cos Cob. The fastest plan anyone in Cos Cob can order from Optimum goes up to 8,000 Mbps, and all Cos Cob customers can get this speed.
Show all download speeds
- 100.0% up to 8,000.0 Mbps
Optimum fiber upload speeds
In Cos Cob download speeds tend to be equal to than upload speeds for Optimum fiber. Compared to other ISPs, Optimum is the fastest where upload speeds are concerned, and the fastest compared to other Cos Cob fiber providers. Optimum offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Cos Cob is up to 8,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 8,000.0 Mbps
EarthLink Fiber in Cos Cob, CT
EarthLink fiber coverage
About 96.81%, or 7,792 people, have EarthLink fiber internet available to them in the city. The company covers the entire Cos Cob area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in most of Cos Cob.
EarthLink fiber download speeds
EarthLink is below average when comparing download speeds to all other internet providers in Cos Cob. Versus other fiber providers in the area, EarthLink fiber is one of the slowest. There are 2 different maximum speeds throughout Cos Cob. The fastest plan anyone in Cos Cob can order from EarthLink goes up to 2,048 Mbps, the slowest package only goes up to 940 Mbps, and the city-wide average maximum speed for Cos Cob customers is up to 1,007 Mbps.
Show all download speeds
- 6.0% up to 2,048.0 Mbps
- 94.0% up to 940.0 Mbps
EarthLink fiber upload speeds
In Cos Cob download speeds tend to be faster than than upload speeds for EarthLink fiber. Compared to other ISPs, EarthLink is below average where upload speeds are concerned, and one of the slowest compared to other Cos Cob fiber providers. EarthLink offers 2 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Cos Cob is up to 2,048 Mbps. Some customers have slower plan choices, which only go up to 880 Mbps. On average, EarthLink customers can get speeds up to 951 Mbps.
Show all upload speeds
- 6.0% up to 2,048.0 Mbps
- 94.0% up to 880.0 Mbps
Verizon Fiber in Cos Cob, CT
Verizon fiber coverage
About 96.81%, or 7,792 people, have Verizon fiber internet available to them in the city. The company covers the entire Cos Cob area. Verizon is one of the largest internet service providers internet service providers in the US, with internet service available in most of Cos Cob.
Verizon fiber download speeds
Verizon is below average when comparing download speeds to all other internet providers in Cos Cob. Versus other fiber providers in the area, Verizon fiber is one of the slowest. There are 2 different maximum speeds throughout Cos Cob. The fastest plan anyone in Cos Cob can order from Verizon goes up to 2,048 Mbps, the slowest package only goes up to 940 Mbps, and the city-wide average maximum speed for Cos Cob customers is up to 1,007 Mbps.
Show all download speeds
- 6.0% up to 2,048.0 Mbps
- 94.0% up to 940.0 Mbps
Verizon fiber upload speeds
In Cos Cob download speeds tend to be faster than than upload speeds for Verizon fiber. Compared to other ISPs, Verizon is below average where upload speeds are concerned, and one of the slowest compared to other Cos Cob fiber providers. Verizon offers 2 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Cos Cob is up to 2,048 Mbps. Some customers have slower plan choices, which only go up to 880 Mbps. On average, Verizon customers can get speeds up to 951 Mbps.
Show all upload speeds
- 6.0% up to 2,048.0 Mbps
- 94.0% up to 880.0 Mbps
Frontier Communications Fiber in Cos Cob, CT
Frontier fiber coverage
About 7.45%, or 600 people, have Frontier fiber internet available to them in the city. The company covers the northeast Cos Cob area. Frontier is one of the largest internet service providers internet service providers in the US, with internet service available in a very small piece of Cos Cob.
Frontier Communications fiber download speeds
Frontier is above average when comparing download speeds to all other internet providers in Cos Cob. Versus other fiber providers in the area, Frontier fiber is above average. There are no different maximum speeds throughout Cos Cob. The fastest plan anyone in Cos Cob can order from Frontier goes up to 7,000 Mbps, and all Cos Cob customers can get this speed.
Show all download speeds
- 100.0% up to 7,000.0 Mbps
Frontier Communications fiber upload speeds
In Cos Cob download speeds tend to be equal to than upload speeds for Frontier fiber. Compared to other ISPs, Frontier is above average where upload speeds are concerned, and above average compared to other Cos Cob fiber providers. Frontier offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Cos Cob is up to 7,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 7,000.0 Mbps
T-Mobile Home Internet Fixed Wireless in Cos Cob, CT
T-Mobile Home Internet fixed wireless coverage
About 75.77%, or 6,099 people, have T-Mobile Home Internet fixed wireless internet available to them in the city. The company covers the northeast, east, west, southwest, south, north, central, and southeast Cos Cob area. T-Mobile Home Internet is one of the largest internet service providers internet service providers in the US, with internet service available in much of Cos Cob.
T-Mobile Home Internet fixed wireless download speeds
T-Mobile Home Internet is below average when comparing download speeds to all other internet providers in Cos Cob. Versus other fixed wireless providers in the area, T-Mobile Home Internet fixed wireless is below average. There are 2 different maximum speeds throughout Cos Cob. The fastest plan anyone in Cos Cob can order from T-Mobile Home Internet goes up to 100 Mbps, the slowest package only goes up to 25 Mbps, and the city-wide average maximum speed for Cos Cob customers is up to 37 Mbps.
Show all download speeds
- 16.6% up to 100.0 Mbps
- 83.4% up to 25.0 Mbps
T-Mobile Home Internet fixed wireless upload speeds
In Cos Cob download speeds tend to be faster than than upload speeds for T-Mobile Home Internet fixed wireless. Compared to other ISPs, T-Mobile Home Internet is below average where upload speeds are concerned, and below average compared to other Cos Cob fixed wireless providers. T-Mobile Home Internet offers 2 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Cos Cob is up to 20 Mbps. Some customers have slower plan choices, which only go up to 3.0 Mbps. On average, T-Mobile Home Internet customers can get speeds up to 5.8 Mbps.
Show all upload speeds
- 16.6% up to 20.0 Mbps
- 83.4% up to 3.0 Mbps
EarthLink Fixed Wireless in Cos Cob, CT
EarthLink fixed wireless coverage
About 45.48%, or 3,661 people, have EarthLink fixed wireless internet available to them in the city. The company covers the east, northeast, southwest, south, central, southeast, and west Cos Cob area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in some of Cos Cob.
EarthLink fixed wireless download speeds
EarthLink is one of the slowest when comparing download speeds to all other internet providers in Cos Cob. Versus other fixed wireless providers in the area, EarthLink fixed wireless is one of the slowest. There are 2 different maximum speeds throughout Cos Cob. The fastest plan anyone in Cos Cob can order from EarthLink goes up to 100 Mbps, the slowest package only goes up to 25 Mbps, and the city-wide average maximum speed for Cos Cob customers is up to 32 Mbps.
Show all download speeds
- 9.2% up to 100.0 Mbps
- 90.8% up to 25.0 Mbps
EarthLink fixed wireless upload speeds
In Cos Cob download speeds tend to be faster than than upload speeds for EarthLink fixed wireless. Compared to other ISPs, EarthLink is one of the slowest where upload speeds are concerned, and one of the slowest compared to other Cos Cob fixed wireless providers. EarthLink offers 2 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Cos Cob is up to 20 Mbps. Some customers have slower plan choices, which only go up to 3.0 Mbps. On average, EarthLink customers can get speeds up to 4.6 Mbps.
Show all upload speeds
- 9.2% up to 20.0 Mbps
- 90.8% up to 3.0 Mbps
AT&T Fixed Wireless in Cos Cob, CT
AT&T fixed wireless coverage
About 45.48%, or 3,661 people, have AT&T fixed wireless internet available to them in the city. The company covers the east, northeast, southwest, south, central, southeast, and west Cos Cob area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in some of Cos Cob.
AT&T fixed wireless download speeds
AT&T is one of the slowest when comparing download speeds to all other internet providers in Cos Cob. Versus other fixed wireless providers in the area, AT&T fixed wireless is one of the slowest. There are 2 different maximum speeds throughout Cos Cob. The fastest plan anyone in Cos Cob can order from AT&T goes up to 100 Mbps, the slowest package only goes up to 25 Mbps, and the city-wide average maximum speed for Cos Cob customers is up to 32 Mbps.
Show all download speeds
- 9.2% up to 100.0 Mbps
- 90.8% up to 25.0 Mbps
AT&T fixed wireless upload speeds
In Cos Cob download speeds tend to be faster than than upload speeds for AT&T fixed wireless. Compared to other ISPs, AT&T is one of the slowest where upload speeds are concerned, and one of the slowest compared to other Cos Cob fixed wireless providers. AT&T offers 2 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Cos Cob is up to 20 Mbps. Some customers have slower plan choices, which only go up to 3.0 Mbps. On average, AT&T customers can get speeds up to 4.6 Mbps.
Show all upload speeds
- 9.2% up to 20.0 Mbps
- 90.8% up to 3.0 Mbps
Verizon Fixed Wireless in Cos Cob, CT
Verizon fixed wireless coverage
About 26.18%, or 2,107 people, have Verizon fixed wireless internet available to them in the city. The company covers the east, northeast, central, and southeast Cos Cob area. Verizon is one of the largest internet service providers internet service providers in the US, with internet service available in a small portion of Cos Cob.
Verizon fixed wireless download speeds
Verizon is below average when comparing download speeds to all other internet providers in Cos Cob. Versus other fixed wireless providers in the area, Verizon fixed wireless is the fastest. There are no different maximum speeds throughout Cos Cob. The fastest plan anyone in Cos Cob can order from Verizon goes up to 300 Mbps, and all Cos Cob customers can get this speed.
Show all download speeds
- 100.0% up to 300.0 Mbps
Verizon fixed wireless upload speeds
In Cos Cob download speeds tend to be faster than than upload speeds for Verizon fixed wireless. Compared to other ISPs, Verizon is below average where upload speeds are concerned, and the fastest compared to other Cos Cob fixed wireless providers. Verizon offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Cos Cob is up to 20 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 20.0 Mbps
Cos Cob Internet by Area
This information is most helpful to those looking for homes or considering moving to Cos Cob or any of the areas nearby.
How does internet in Cos Cob compare to the rest of Connecticut?
Internet speeds in Cos Cob are much faster versus the average speeds in Connecticut: 6,732 Mbps in Connecticut versus 7,912 Mbps in the city. The state has similar internet availability compared to the city. Average internet coverage in Connecticut is 98.58% versus 99.71% in Cos Cob.
What zip codes have widespread internet?
Internet coverage varies by zip code and neighborhood. Some examples in or around Cos Cob are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does internet service look like in other cities?
Below are cities nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Cities
- Riverside, CT: more internet coverage, faster speeds
- Old Greenwich, CT: more internet coverage, faster speeds
- Greenwich, CT: less internet coverage, slower speeds
- Stamford, CT: more internet coverage, slower speeds
- Port Chester, NY: more internet coverage, faster speeds
- Rye Brook, NY: more internet coverage, slower speeds
- Darien, CT: more internet coverage, faster speeds
- Purchase, NY: less internet coverage, slower speeds
- Rye, NY: more internet coverage, slower speeds
- Harrison, NY: less internet coverage, slower speeds
Cities with Similar Populations
- Cohasset, MA: more internet coverage, slower speeds
- Solvang, CA: less internet coverage, slower speeds
- Smithville, TX: less internet coverage, slower speeds
- Smithsburg, MD: less internet coverage, slower speeds
- Smiths, AL: more internet coverage, slower speeds
- Creston, IA: less internet coverage, slower speeds
- Cowpens, SC: less internet coverage, slower speeds
- Country Club Estates, GA: less internet coverage, slower speeds
- Colonial Beach, VA: more internet coverage, slower speeds
- Somerville, AL: more internet coverage, slower speeds