In San Carlos there are 4 residential Fiber providers covering 95.88% of the city. The average home can get speeds up to 4,560 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 San Carlos, CA.
To see availability maps for all providers including fiber, cable, DSL, and more in San Carlos, CA please click below.
San Carlos, CA Availability Maps
Fiber Internet Service Providers in San Carlos
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 San Carlos are not shown.
San Carlos 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 San Carlos is fiber internet available?
Fiber Internet Availability Key
Fiber is available in 95.88% of San Carlos. 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 San Carlos above to see who has service at your home.
How fast is fiber internet in San Carlos?
The map below shows maximum fiber internet speeds by area in San Carlos.
Fiber Internet Speed Key
The average San Carlos home can get up to 4,560 Mbps on their fiber internet plan. The fastest fiber download speed in the city is 10,000 Mbps, which less than 1% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 10.75% of homes can only purchase plans up to 1,000 Mbps. See the internet provider details below for info about their speed and coverage in San Carlos.
Fiber internet speeds tend to be faster in the southeast parts of San Carlos, and slower in the southwest areas of the city.
Is fiber the fastest internet I can get in San Carlos?
The fastest internet for you may vary based on where in San Carlos you live. In general, cable competes most often with fiber in the city.
- Fiber is the fastest internet type for 85.13% of San Carlos homes.
- Cable is fastest for 14.79% 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 San Carlos homes.
Fiber Providers in Depth
Below you'll find which TV and internet providers offer service in San Carlos, along with details on where in San Carlos and at what speeds.
EarthLink Fiber in San Carlos, CA
EarthLink fiber coverage
About 89.15%, or 28,735 people, have EarthLink fiber internet available to them in the city. The company covers the entire San Carlos area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in most of San Carlos.
EarthLink fiber download speeds
EarthLink is one of the fastest when comparing download speeds to all other internet providers in San Carlos. Versus other fiber providers in the area, EarthLink fiber is one of the fastest. There are 2 different maximum speeds throughout San Carlos. The fastest plan anyone in San Carlos can order from EarthLink goes up to 5,000 Mbps, the slowest package only goes up to 1,000 Mbps, and the city-wide average maximum speed for San Carlos customers is up to 4,819 Mbps.
Show all download speeds
- 95.5% up to 5,000.0 Mbps
- 4.5% up to 1,000.0 Mbps
EarthLink fiber upload speeds
In San Carlos download speeds tend to be equal to than upload speeds for EarthLink fiber. Compared to other ISPs, EarthLink is one of the fastest where upload speeds are concerned, and one of the fastest compared to other San Carlos 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 San Carlos 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 4,819 Mbps.
Show all upload speeds
- 95.5% up to 5,000.0 Mbps
- 4.5% up to 1,000.0 Mbps
AT&T Fiber in San Carlos, CA
AT&T fiber coverage
About 89.15%, or 28,735 people, have AT&T fiber internet available to them in the city. The company covers the entire San Carlos area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in most of San Carlos.
AT&T fiber download speeds
AT&T is one of the fastest when comparing download speeds to all other internet providers in San Carlos. Versus other fiber providers in the area, AT&T fiber is one of the fastest. There are 2 different maximum speeds throughout San Carlos. The fastest plan anyone in San Carlos can order from AT&T goes up to 5,000 Mbps, the slowest package only goes up to 1,000 Mbps, and the city-wide average maximum speed for San Carlos customers is up to 4,819 Mbps.
Show all download speeds
- 95.5% up to 5,000.0 Mbps
- 4.5% up to 1,000.0 Mbps
AT&T fiber upload speeds
In San Carlos download speeds tend to be equal to than upload speeds for AT&T fiber. Compared to other ISPs, AT&T is one of the fastest where upload speeds are concerned, and one of the fastest compared to other San Carlos fiber 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 San Carlos 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 4,819 Mbps.
Show all upload speeds
- 95.5% up to 5,000.0 Mbps
- 4.5% up to 1,000.0 Mbps
Sonic Fiber in San Carlos, CA
Sonic fiber coverage
About 86.38%, or 27,841 people, have Sonic fiber internet available to them in the city. The company covers the entire San Carlos area. Sonic is a large internet service provider internet service providers in the US, with internet service available in most of San Carlos.
Sonic fiber download speeds
Sonic is below average when comparing download speeds to all other internet providers in San Carlos. Versus other fiber providers in the area, Sonic fiber is the slowest. There are 2 different maximum speeds throughout San Carlos. The fastest plan anyone in San Carlos can order from Sonic goes up to 10,000 Mbps, the slowest package only goes up to 1,000 Mbps, and the city-wide average maximum speed for San Carlos customers is up to 1,018 Mbps.
Show all download speeds
- 0.2% up to 10,000.0 Mbps
- 99.8% up to 1,000.0 Mbps
Sonic fiber upload speeds
In San Carlos download speeds tend to be equal to than upload speeds for Sonic fiber. Compared to other ISPs, Sonic is above average where upload speeds are concerned, and below average compared to other San Carlos fiber providers. Sonic 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 San Carlos is up to 10,000 Mbps. Some customers have slower plan choices, which only go up to 1,000 Mbps. On average, Sonic customers can get speeds up to 1,018 Mbps.
Show all upload speeds
- 0.2% up to 10,000.0 Mbps
- 99.8% up to 1,000.0 Mbps
XFINITY from Comcast Fiber in San Carlos, CA
XFINITY fiber coverage
About 1.01%, or 324 people, have XFINITY fiber internet available to them in the city. The company covers the north San Carlos area. XFINITY is one of the largest internet service providers internet service providers in the US, with internet service available in a very small piece of San Carlos.
XFINITY from Comcast fiber download speeds
XFINITY is above average when comparing download speeds to all other internet providers in San Carlos. Versus other fiber providers in the area, XFINITY fiber is below average. There are no different maximum speeds throughout San Carlos. The fastest plan anyone in San Carlos can order from XFINITY goes up to 2,000 Mbps, and all San Carlos customers can get this speed.
Show all download speeds
- 100.0% up to 2,000.0 Mbps
XFINITY from Comcast fiber upload speeds
In San Carlos download speeds tend to be faster than than upload speeds for XFINITY fiber. Compared to other ISPs, XFINITY is below average where upload speeds are concerned, and the slowest compared to other San Carlos fiber providers. XFINITY offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in San Carlos is up to 250 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 250.0 Mbps
San Carlos Fiber by Area
This information is most helpful to those looking for homes or considering moving to San Carlos or any of the areas nearby.
How does fiber internet in San Carlos compare to the rest of California?
Fiber internet speeds in San Carlos are much faster versus the average speeds in California: 0.00 Mbps in California versus 4,560 Mbps in the city. The state has similar fiber availability compared to the city. Average fiber coverage in California is 0.00% versus 95.88% in San Carlos.
What zip codes have fiber internet?
Fiber internet coverage varies by zip code and neighborhood. Some examples in or around San Carlos 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
- Belmont, CA: less fiber coverage, faster speeds
- Redwood City, CA: less fiber coverage, faster speeds
- North Fair Oaks, CA: more fiber coverage, faster speeds
- Foster City, CA: less fiber coverage, slower speeds
- Woodside, CA: less fiber coverage, faster speeds
- San Mateo, CA: less fiber coverage, faster speeds
- Atherton, CA: less fiber coverage, faster speeds
- Highlands-Baywood Park, CA: more fiber coverage, faster speeds
- Menlo Park, CA: less fiber coverage, faster speeds
- Hillsborough, CA: less fiber coverage, slower speeds
Cities with Similar Populations
- Milford, OH: more fiber coverage, slower speeds
- Pueblo West, CO: less fiber coverage, slower speeds
- Port Chester, NY: more fiber coverage, faster speeds
- Plattsburgh, NY: less fiber coverage, slower speeds
- Pittsford, NY: less fiber coverage, faster speeds
- Pineville, LA: less fiber coverage, faster speeds
- Paradise Hills, NM: less fiber coverage, slower speeds
- Palm City, FL: less fiber coverage, slower speeds
- Orangevale, CA: less fiber coverage, faster speeds
- Niles, IL: less fiber coverage, slower speeds