In San Mateo County there are 4 residential DSL providers covering 78.37% of the county. The average home can get speeds up to 119 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 DSL 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
DSL 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 DSL internet available?
DSL Internet Availability Key
DSL is available in 78.37% of San Mateo County. Areas in green have DSL 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 Mateo County above to see who has service at your home.
How fast is DSL internet in San Mateo County?
The map below shows maximum DSL internet speeds by area in San Mateo County.
DSL Internet Speed Key
The average San Mateo County home can get up to 119 Mbps on their DSL internet plan. The fastest DSL download speed in the county is 1,000 Mbps, which 3.97% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 10.47% of homes can only purchase plans up to 10 Mbps. See the internet provider details below for info about their speed and coverage in San Mateo County.
DSL internet speeds tend to be faster in the east parts of San Mateo County, and slower in the southwest areas of the county.
Is DSL 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 DSL 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.
DSL 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.
AT&T DSL in San Mateo County, CA
AT&T DSL coverage
About 78.08%, or 596,840 people, have AT&T DSL internet available to them in the county. The company covers the entire San Mateo County area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in much of San Mateo County.
AT&T DSL download speeds
AT&T is below average when comparing download speeds to all other internet providers in San Mateo County. Versus other DSL providers in the area, AT&T DSL is below average. There are 5 different maximum speeds throughout San Mateo County. The fastest plan anyone in San Mateo County can order from AT&T goes up to 100 Mbps, the slowest package only goes up to 10 Mbps, and the county-wide average maximum speed for San Mateo County customers is up to 72 Mbps.
Show all download speeds
- 52.0% up to 100.0 Mbps
- 12.5% up to 75.0 Mbps
- 15.6% up to 50.0 Mbps
- 6.2% up to 25.0 Mbps
- 13.7% up to 10.0 Mbps
AT&T DSL upload speeds
In San Mateo County download speeds tend to be faster than than upload speeds for AT&T DSL. Compared to other ISPs, AT&T is below average where upload speeds are concerned, and below average compared to other San Mateo County DSL providers. AT&T offers 4 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 20 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, AT&T customers can get speeds up to 15 Mbps.
Show all upload speeds
- 64.5% up to 20.0 Mbps
- 15.6% up to 10.0 Mbps
- 6.2% up to 5.0 Mbps
- 13.7% up to 1.0 Mbps
EarthLink DSL in San Mateo County, CA
EarthLink DSL coverage
About 78.08%, or 596,840 people, have EarthLink DSL internet available to them in the county. The company covers the entire San Mateo County area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in much of San Mateo County.
EarthLink DSL download speeds
EarthLink is below average when comparing download speeds to all other internet providers in San Mateo County. Versus other DSL providers in the area, EarthLink DSL is below average. There are 5 different maximum speeds throughout San Mateo County. The fastest plan anyone in San Mateo County can order from EarthLink goes up to 100 Mbps, the slowest package only goes up to 10 Mbps, and the county-wide average maximum speed for San Mateo County customers is up to 72 Mbps.
Show all download speeds
- 52.0% up to 100.0 Mbps
- 12.5% up to 75.0 Mbps
- 15.6% up to 50.0 Mbps
- 6.2% up to 25.0 Mbps
- 13.7% up to 10.0 Mbps
EarthLink DSL upload speeds
In San Mateo County download speeds tend to be faster than than upload speeds for EarthLink DSL. Compared to other ISPs, EarthLink is below average where upload speeds are concerned, and below average compared to other San Mateo County DSL providers. EarthLink offers 4 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 20 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, EarthLink customers can get speeds up to 15 Mbps.
Show all upload speeds
- 64.5% up to 20.0 Mbps
- 15.6% up to 10.0 Mbps
- 6.2% up to 5.0 Mbps
- 13.7% up to 1.0 Mbps
Astound Broadband DSL in San Mateo County, CA
Astound Broadband DSL coverage
About 2.09%, or 15,998 people, have Astound Broadband DSL internet available to them in the county. The company covers the central, southeast, northwest, and north 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 a very small piece of San Mateo County.
Astound Broadband DSL download speeds
Astound Broadband is below average when comparing download speeds to all other internet providers in San Mateo County. Versus other DSL providers in the area, Astound Broadband DSL is one of the fastest. 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 1,000 Mbps, and all San Mateo County customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
Astound Broadband DSL upload speeds
In San Mateo County download speeds tend to be faster than than upload speeds for Astound Broadband DSL. Compared to other ISPs, Astound Broadband is below average where upload speeds are concerned, and below average compared to other San Mateo County DSL 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 10 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 10.0 Mbps
Sail Internet DSL in San Mateo County, CA
Sail Internet DSL coverage
About 1.88%, or 14,369 people, have Sail Internet DSL internet available to them in the county. The company covers the northwest, east, central, and north San Mateo County area. Sail Internet is a large internet service provider internet service providers in the US, with internet service available in a very small piece of San Mateo County.
Sail Internet DSL download speeds
Sail Internet is below average when comparing download speeds to all other internet providers in San Mateo County. Versus other DSL providers in the area, Sail Internet DSL is one of the fastest. There are no different maximum speeds throughout San Mateo County. The fastest plan anyone in San Mateo County can order from Sail Internet goes up to 1,000 Mbps, and all San Mateo County customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
Sail Internet DSL upload speeds
In San Mateo County download speeds tend to be equal to than upload speeds for Sail Internet DSL. Compared to other ISPs, Sail Internet is below average where upload speeds are concerned, and the fastest compared to other San Mateo County DSL providers. Sail Internet 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 1,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1,000.0 Mbps
San Mateo County DSL 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 DSL internet in San Mateo County compare to the rest of California?
DSL internet speeds in San Mateo County are much faster versus the average speeds in California: 0.00 Mbps in California versus 119 Mbps in the county. The state has similar DSL availability compared to the county. Average DSL coverage in California is 0.00% versus 78.37% in San Mateo County.
What zip codes have DSL internet?
DSL 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 DSL 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: more DSL coverage, slower speeds
- Mariposa County, CA: more DSL coverage, slower speeds
- San Juan County, UT: less DSL coverage, slower speeds
- Rio Grande County, CO: more DSL coverage, slower speeds
- Alamosa County, CO: more DSL coverage, slower speeds
- Huerfano County, CO: more DSL coverage, slower speeds
- Stanton County, KS: less DSL coverage, slower speeds
- Grant County, KS: less DSL coverage, slower speeds
- Haskell County, KS: less DSL coverage, slower speeds
- Kiowa County, KS: less DSL coverage, slower speeds
Counties with Similar Populations
- Cobb County, GA: more DSL coverage, slower speeds
- San Joaquin County, CA: less DSL coverage, slower speeds
- Middlesex County, NJ: less DSL coverage, slower speeds
- Monroe County, NY: less DSL coverage, slower speeds
- Montgomery County, PA: less DSL coverage, slower speeds
- Multnomah County, OR: less DSL coverage, slower speeds
- Oklahoma County, OK: less DSL coverage, slower speeds
- Polk County, FL: less DSL coverage, slower speeds
- Lake County, IL: more DSL coverage, slower speeds
- Snohomish County, WA: less DSL coverage, slower speeds