In Cos Cob there are 4 residential Fiber 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.
This page contains all Fiber internet providers in Cos Cob, CT.
To see availability maps for all providers including fiber, cable, DSL, and more in Cos Cob, CT please click below.
Fiber 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
Where in Cos Cob is fiber internet available?
Fiber Internet Availability Key
Fiber is available in 99.71% of Cos Cob. Areas in green have fiber internet service, where areas in yellow or red may not. The most widely available provider is Optimum. Call one of the companies with service in Cos Cob above to see who has service at your home.
How fast is fiber internet in Cos Cob?
The map below shows maximum fiber internet speeds by area in Cos Cob.
Fiber Internet Speed Key
The average Cos Cob home can get up to 7,912 Mbps on their fiber internet plan. The fastest fiber 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.
Fiber internet speeds tend to be faster in the northeast parts of Cos Cob, and slower in the south areas of the city.
Is fiber the fastest internet I can get in Cos Cob?
The fastest internet for you may vary based on where in Cos Cob you live. In general, satellite competes most often with fiber 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.
Fiber 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 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
Cos Cob Fiber 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 fiber internet in Cos Cob compare to the rest of Connecticut?
Fiber internet speeds in Cos Cob are much faster versus the average speeds in Connecticut: 0.00 Mbps in Connecticut versus 7,912 Mbps in the city. The state has similar fiber availability compared to the city. Average fiber coverage in Connecticut is 0.00% versus 99.71% in Cos Cob.
What zip codes have fiber internet?
Fiber 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 fiber internet 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: less fiber coverage, faster speeds
- Old Greenwich, CT: more fiber coverage, faster speeds
- Greenwich, CT: less fiber coverage, slower speeds
- Stamford, CT: less fiber coverage, faster speeds
- Port Chester, NY: more fiber coverage, faster speeds
- Rye Brook, NY: more fiber coverage, slower speeds
- Darien, CT: more fiber coverage, faster speeds
- Purchase, NY: less fiber coverage, slower speeds
- Rye, NY: more fiber coverage, slower speeds
- Harrison, NY: less fiber coverage, slower speeds
Cities with Similar Populations
- Cohasset, MA: less fiber coverage, slower speeds
- Solvang, CA: less fiber coverage, slower speeds
- Smithville, TX: less fiber coverage, slower speeds
- Smithsburg, MD: less fiber coverage, slower speeds
- Smiths, AL: less fiber coverage, slower speeds
- Creston, IA: less fiber coverage, slower speeds
- Cowpens, SC: less fiber coverage, slower speeds
- Country Club Estates, GA: less fiber coverage, slower speeds
- Colonial Beach, VA: less fiber coverage, slower speeds
- Somerville, AL: less fiber coverage, slower speeds