In Marin County there are 4 residential Fiber providers covering 58.15% of the county. The average home can get speeds up to 4,782 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 Marin County, CA.
To see availability maps for all providers including fiber, cable, DSL, and more in Marin County, CA please click below.
Marin County, CA Availability Maps
Fiber Internet Service Providers in Marin County
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 Marin County are not shown.
Marin County 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 Marin County is fiber internet available?
Fiber Internet Availability Key
Fiber is available in 58.15% of Marin County. Areas in green have fiber internet service, where areas in yellow or red may not. The most widely available provider is AT&T. Call one of the companies with service in Marin County above to see who has service at your home.
How fast is fiber internet in Marin County?
The map below shows maximum fiber internet speeds by area in Marin County.
Fiber Internet Speed Key
The average Marin County home can get up to 4,782 Mbps on their fiber internet plan. The fastest fiber download speed in the county is 10,000 Mbps, which 9.50% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, less than 1% of homes can only purchase plans up to 300 Mbps. See the internet provider details below for info about their speed and coverage in Marin County.
Fiber internet speeds tend to be faster in the east parts of Marin County, and slower in the southwest areas of the county.
Is fiber the fastest internet I can get in Marin County?
The fastest internet for you may vary based on where in Marin County you live. In general, cable competes most often with fiber in the county.
- Fiber is the fastest internet type for 53.76% of Marin County homes.
- Cable is fastest for 44.46% of the county.
- 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 Marin County homes.
Fiber Providers in Depth
Below you'll find which TV and internet providers offer service in Marin County, along with details on where in Marin County and at what speeds.
EarthLink Fiber in Marin County, CA
EarthLink fiber coverage
About 42.27%, or 110,877 people, have EarthLink fiber internet available to them in the county. The company covers the entire Marin County area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in some of Marin County.
EarthLink fiber download speeds
EarthLink is above average when comparing download speeds to all other internet providers in Marin County. Versus other fiber providers in the area, EarthLink fiber is above average. There are 2 different maximum speeds throughout Marin County. The fastest plan anyone in Marin County can order from EarthLink goes up to 5,000 Mbps, the slowest package only goes up to 1,000 Mbps, and the county-wide average maximum speed for Marin County customers is up to 4,424 Mbps.
Show all download speeds
- 85.6% up to 5,000.0 Mbps
- 14.4% up to 1,000.0 Mbps
EarthLink fiber upload speeds
In Marin County download speeds tend to be equal to than upload speeds for EarthLink fiber. Compared to other ISPs, EarthLink is above average where upload speeds are concerned, and above average compared to other Marin County fiber providers. EarthLink offers 2 different upload speeds across the county, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Marin County is up to 5,000 Mbps. Some customers have slower plan choices, which only go up to 1,000 Mbps. On average, EarthLink customers can get speeds up to 4,424 Mbps.
Show all upload speeds
- 85.6% up to 5,000.0 Mbps
- 14.4% up to 1,000.0 Mbps
AT&T Fiber in Marin County, CA
AT&T fiber coverage
About 42.27%, or 110,877 people, have AT&T fiber internet available to them in the county. The company covers the entire Marin County area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in some of Marin County.
AT&T fiber download speeds
AT&T is above average when comparing download speeds to all other internet providers in Marin County. Versus other fiber providers in the area, AT&T fiber is above average. There are 2 different maximum speeds throughout Marin County. The fastest plan anyone in Marin County can order from AT&T goes up to 5,000 Mbps, the slowest package only goes up to 1,000 Mbps, and the county-wide average maximum speed for Marin County customers is up to 4,424 Mbps.
Show all download speeds
- 85.6% up to 5,000.0 Mbps
- 14.4% up to 1,000.0 Mbps
AT&T fiber upload speeds
In Marin County download speeds tend to be equal to than upload speeds for AT&T fiber. Compared to other ISPs, AT&T is above average where upload speeds are concerned, and above average compared to other Marin County fiber providers. AT&T offers 2 different upload speeds across the county, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Marin County is up to 5,000 Mbps. Some customers have slower plan choices, which only go up to 1,000 Mbps. On average, AT&T customers can get speeds up to 4,424 Mbps.
Show all upload speeds
- 85.6% up to 5,000.0 Mbps
- 14.4% up to 1,000.0 Mbps
Frontier Communications Fiber in Marin County, CA
Frontier fiber coverage
About 13.63%, or 35,757 people, have Frontier fiber internet available to them in the county. The company covers the northwest, north, and northeast Marin County 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 Marin County.
Frontier Communications fiber download speeds
Frontier is above average when comparing download speeds to all other internet providers in Marin County. Versus other fiber providers in the area, Frontier fiber is below average. There are no different maximum speeds throughout Marin County. The fastest plan anyone in Marin County can order from Frontier goes up to 2,000 Mbps, and all Marin County customers can get this speed.
Show all download speeds
- 100.0% up to 2,000.0 Mbps
Frontier Communications fiber upload speeds
In Marin County 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 below average compared to other Marin County fiber providers. Frontier offers no different upload speeds across the county. The fastest upload speed available to anyone from this ISP in Marin County is up to 2,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 2,000.0 Mbps
Sonic Fiber in Marin County, CA
Sonic fiber coverage
About 9.50%, or 24,921 people, have Sonic fiber internet available to them in the county. The company covers the central and east Marin County area. Sonic is a large internet service provider internet service providers in the US, with internet service available in a very small piece of Marin County.
Sonic fiber download speeds
Sonic is the fastest when comparing download speeds to all other internet providers in Marin County. Versus other fiber providers in the area, Sonic fiber is the fastest. There are no different maximum speeds throughout Marin County. The fastest plan anyone in Marin County can order from Sonic goes up to 10,000 Mbps, and all Marin County customers can get this speed.
Show all download speeds
- 100.0% up to 10,000.0 Mbps
Sonic fiber upload speeds
In Marin County download speeds tend to be equal to than upload speeds for Sonic fiber. Compared to other ISPs, Sonic is the fastest where upload speeds are concerned, and the fastest compared to other Marin County fiber providers. Sonic offers no different upload speeds across the county. The fastest upload speed available to anyone from this ISP in Marin County is up to 10,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 10,000.0 Mbps
Marin County Fiber by Area
This information is most helpful to those looking for homes or considering moving to Marin County or any of the areas nearby.
How does fiber internet in Marin County compare to the rest of California?
Fiber internet speeds in Marin County are much faster versus the average speeds in California: 0.00 Mbps in California versus 4,782 Mbps in the county. The state has similar fiber availability compared to the county. Average fiber coverage in California is 0.00% versus 58.15% in Marin County.
What zip codes have fiber internet?
Fiber internet coverage varies by zip code and neighborhood. Some examples in or around Marin County 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 counties?
Below are counties nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Counties
- Contra Costa County, CA: less fiber coverage, faster speeds
- San Joaquin County, CA: less fiber coverage, faster speeds
- Tuolumne County, CA: less fiber coverage, slower speeds
- San Miguel County, CO: less fiber coverage, slower speeds
- San Juan County, CO: more fiber coverage, slower speeds
- Hinsdale County, CO: more fiber coverage, slower speeds
- Saguache County, CO: less fiber coverage, slower speeds
- Otero County, CO: less fiber coverage, slower speeds
- Bent County, CO: more fiber coverage, slower speeds
- Prowers County, CO: less fiber coverage, slower speeds
Counties with Similar Populations
- Yuma County, AZ: more fiber coverage, slower speeds
- Harrison County, MS: more fiber coverage, faster speeds
- Hawaii County, HI: more fiber coverage, slower speeds
- Clay County, FL: more fiber coverage, slower speeds
- Hays County, TX: less fiber coverage, slower speeds
- Clermont County, OH: more fiber coverage, slower speeds
- St. Joseph County, IN: more fiber coverage, faster speeds
- St. Louis County, MN: less fiber coverage, slower speeds
- Hall County, GA: more fiber coverage, slower speeds
- Boulder County, CO: more fiber coverage, faster speeds