In San Mateo County there are 2 residential Cable providers covering 98.61% of the county. The average home can get speeds up to 1,844 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 Cable internet providers in San Mateo County, CA.
To see availability maps for all providers including fiber, cable, DSL, and more in San Mateo County, CA please click below.
San Mateo County, CA Availability Maps
Cable Internet Service Providers in San Mateo 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 San Mateo County are not shown.
San Mateo 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 San Mateo County is cable internet available?
Cable Internet Availability Key
Cable is available in 98.61% of San Mateo County. Areas in green have cable internet service, where areas in yellow or red may not. The most widely available provider is XFINITY. Call one of the companies with service in San Mateo County above to see who has service at your home.
How fast is cable internet in San Mateo County?
The map below shows maximum cable internet speeds by area in San Mateo County.
Cable Internet Speed Key
The average San Mateo County home can get up to 1,844 Mbps on their cable internet plan. The fastest cable download speed in the county is 2,000 Mbps, which 81.01% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 2.91% of homes can only purchase plans up to 300 Mbps. See the internet provider details below for info about their speed and coverage in San Mateo County.
Cable internet speeds tend to be faster in the central parts of San Mateo County, and slower in the west areas of the county.
Is cable the fastest internet I can get in San Mateo County?
The fastest internet for you may vary based on where in San Mateo County you live. In general, fiber competes most often with cable in the county.
- Fiber is the fastest internet type for 74.56% of San Mateo County homes.
- Cable is fastest for 24.83% 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 San Mateo County homes.
Cable Providers in Depth
Below you'll find which TV and internet providers offer service in San Mateo County, along with details on where in San Mateo County and at what speeds.
XFINITY from Comcast Cable in San Mateo County, CA
XFINITY cable coverage
About 98.61%, or 753,826 people, have XFINITY cable internet available to them in the county. The company covers the entire San Mateo County area. XFINITY is one of the largest internet service providers internet service providers in the US, with internet service available in most of San Mateo County.
XFINITY from Comcast cable download speeds
XFINITY is below average when comparing download speeds to all other internet providers in San Mateo County. Versus other cable providers in the area, XFINITY cable is the fastest. There are 3 different maximum speeds throughout San Mateo County. The fastest plan anyone in San Mateo County can order from XFINITY goes up to 2,000 Mbps, the slowest package only goes up to 300 Mbps, and the county-wide average maximum speed for San Mateo County customers is up to 1,830 Mbps.
Show all download speeds
- 82.2% up to 2,000.0 Mbps
- 14.9% up to 1,200.0 Mbps
- 3.0% up to 300.0 Mbps
XFINITY from Comcast cable upload speeds
In San Mateo County download speeds tend to be faster than than upload speeds for XFINITY cable. Compared to other ISPs, XFINITY is below average where upload speeds are concerned, and the fastest compared to other San Mateo County cable providers. XFINITY offers 3 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 San Mateo County is up to 250 Mbps. Some customers have slower plan choices, which only go up to 10 Mbps. On average, XFINITY customers can get speeds up to 211 Mbps.
Show all upload speeds
- 82.2% up to 250.0 Mbps
- 14.9% up to 35.0 Mbps
- 3.0% up to 10.0 Mbps
Astound Broadband Cable in San Mateo County, CA
Astound Broadband cable coverage
About 39.19%, or 299,559 people, have Astound Broadband cable internet available to them in the county. The company covers the northwest, central, southeast, north, and east San Mateo County area. Astound Broadband is one of the largest internet service providers internet service providers in the US, with internet service available in some of San Mateo County.
Astound Broadband cable download speeds
Astound Broadband is below average when comparing download speeds to all other internet providers in San Mateo County. Versus other cable providers in the area, Astound Broadband cable is the slowest. There are no different maximum speeds throughout San Mateo County. The fastest plan anyone in San Mateo County can order from Astound Broadband goes up to 1,500 Mbps, and all San Mateo County customers can get this speed.
Show all download speeds
- 100.0% up to 1,500.0 Mbps
Astound Broadband cable upload speeds
In San Mateo County download speeds tend to be faster than than upload speeds for Astound Broadband cable. Compared to other ISPs, Astound Broadband is below average where upload speeds are concerned, and the slowest compared to other San Mateo County cable providers. Astound Broadband offers no different upload speeds across the county. The fastest upload speed available to anyone from this ISP in San Mateo County is up to 50 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 50.0 Mbps
San Mateo County Cable by Area
This information is most helpful to those looking for homes or considering moving to San Mateo County or any of the areas nearby.
How does cable internet in San Mateo County compare to the rest of California?
Cable internet speeds in San Mateo County are much faster versus the average speeds in California: 0.00 Mbps in California versus 1,844 Mbps in the county. The state has similar cable availability compared to the county. Average cable coverage in California is 0.00% versus 98.61% in San Mateo County.
What zip codes have cable internet?
Cable internet coverage varies by zip code and neighborhood. Some examples in or around San Mateo County are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does cable 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
- Stanislaus County, CA: less cable coverage, slower speeds
- San Juan County, UT: less cable coverage, slower speeds
- Rio Grande County, CO: less cable coverage, slower speeds
- Alamosa County, CO: less cable coverage, slower speeds
- Huerfano County, CO: less cable coverage, slower speeds
- Haskell County, KS: less cable coverage, slower speeds
- Pratt County, KS: less cable coverage, faster speeds
- Kingman County, KS: less cable coverage, faster speeds
- Sedgwick County, KS: less cable coverage, faster speeds
- Elk County, KS: less cable coverage, slower speeds
Counties with Similar Populations
- Baltimore County, MD: less cable coverage, slower speeds
- Cobb County, GA: more cable coverage, faster speeds
- San Joaquin County, CA: less cable coverage, slower speeds
- Middlesex County, NJ: less cable coverage, slower speeds
- Monroe County, NY: less cable coverage, slower speeds
- Montgomery County, PA: more cable coverage, slower speeds
- Multnomah County, OR: less cable coverage, slower speeds
- Norfolk County, MA: more cable coverage, slower speeds
- Oklahoma County, OK: less cable coverage, faster speeds
- Polk County, FL: less cable coverage, slower speeds