In Foster City there are 3 residential DSL providers covering 72.94% of the city. The average home can get speeds up to 177 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 Foster City, CA.
To see availability maps for all providers including fiber, cable, DSL, and more in Foster City, CA please click below.
Foster City, CA Availability Maps
DSL Internet Service Providers in Foster City
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 Foster City are not shown.
Foster City 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 Foster City is DSL internet available?
DSL Internet Availability Key
DSL is available in 72.94% of Foster City. Areas in green have DSL internet service, where areas in yellow or red may not. The most widely available provider is Sail Internet. Call one of the companies with service in Foster City above to see who has service at your home.
How fast is DSL internet in Foster City?
The map below shows maximum DSL internet speeds by area in Foster City.
DSL Internet Speed Key
The average Foster City home can get up to 177 Mbps on their DSL internet plan. The fastest DSL download speed in the city is 1,000 Mbps, which 7.30% 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 10 Mbps. See the internet provider details below for info about their speed and coverage in Foster City.
DSL internet speeds tend to be faster in the west parts of Foster City, and slower in the northwest areas of the city.
Is DSL the fastest internet I can get in Foster City?
The fastest internet for you may vary based on where in Foster City you live. In general, fiber competes most often with DSL in the city.
- Fiber is the fastest internet type for 50.53% of Foster City homes.
- Cable is fastest for 49.31% 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 Foster City homes.
DSL Providers in Depth
Below you'll find which TV and internet providers offer service in Foster City, along with details on where in Foster City and at what speeds.
AT&T DSL in Foster City, CA
AT&T DSL coverage
About 72.94%, or 24,844 people, have AT&T DSL internet available to them in the city. The company covers the entire Foster City area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in much of Foster City.
AT&T DSL download speeds
AT&T is below average when comparing download speeds to all other internet providers in Foster City. Versus other DSL providers in the area, AT&T DSL is one of the slowest. There are 5 different maximum speeds throughout Foster City. The fastest plan anyone in Foster City can order from AT&T goes up to 100 Mbps, the slowest package only goes up to 10 Mbps, and the city-wide average maximum speed for Foster City customers is up to 87 Mbps.
Show all download speeds
- 73.6% up to 100.0 Mbps
- 8.0% up to 75.0 Mbps
- 10.1% up to 50.0 Mbps
- 7.4% up to 25.0 Mbps
- 0.9% up to 10.0 Mbps
AT&T DSL upload speeds
In Foster City 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 one of the slowest compared to other Foster City DSL providers. AT&T offers 4 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 Foster City 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 18 Mbps.
Show all upload speeds
- 81.6% up to 20.0 Mbps
- 10.1% up to 10.0 Mbps
- 7.4% up to 5.0 Mbps
- 0.9% up to 1.0 Mbps
EarthLink DSL in Foster City, CA
EarthLink DSL coverage
About 72.94%, or 24,844 people, have EarthLink DSL internet available to them in the city. The company covers the entire Foster City area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in much of Foster City.
EarthLink DSL download speeds
EarthLink is below average when comparing download speeds to all other internet providers in Foster City. Versus other DSL providers in the area, EarthLink DSL is one of the slowest. There are 5 different maximum speeds throughout Foster City. The fastest plan anyone in Foster City can order from EarthLink goes up to 100 Mbps, the slowest package only goes up to 10 Mbps, and the city-wide average maximum speed for Foster City customers is up to 87 Mbps.
Show all download speeds
- 73.6% up to 100.0 Mbps
- 8.0% up to 75.0 Mbps
- 10.1% up to 50.0 Mbps
- 7.4% up to 25.0 Mbps
- 0.9% up to 10.0 Mbps
EarthLink DSL upload speeds
In Foster City 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 one of the slowest compared to other Foster City DSL providers. EarthLink offers 4 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 Foster City 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 18 Mbps.
Show all upload speeds
- 81.6% up to 20.0 Mbps
- 10.1% up to 10.0 Mbps
- 7.4% up to 5.0 Mbps
- 0.9% up to 1.0 Mbps
Sail Internet DSL in Foster City, CA
Sail Internet DSL coverage
About 7.30%, or 2,487 people, have Sail Internet DSL internet available to them in the city. The company covers the west, east, and north Foster City 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 Foster City.
Sail Internet DSL download speeds
Sail Internet is below average when comparing download speeds to all other internet providers in Foster City. Versus other DSL providers in the area, Sail Internet DSL is the fastest. There are no different maximum speeds throughout Foster City. The fastest plan anyone in Foster City can order from Sail Internet goes up to 1,000 Mbps, and all Foster City customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
Sail Internet DSL upload speeds
In Foster City download speeds tend to be equal to than upload speeds for Sail Internet DSL. Compared to other ISPs, Sail Internet is above average where upload speeds are concerned, and the fastest compared to other Foster City DSL providers. Sail Internet offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Foster City is up to 1,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1,000.0 Mbps
Foster City DSL by Area
This information is most helpful to those looking for homes or considering moving to Foster City or any of the areas nearby.
How does DSL internet in Foster City compare to the rest of California?
DSL internet speeds in Foster City are much faster versus the average speeds in California: 0.00 Mbps in California versus 177 Mbps in the city. The state has similar DSL availability compared to the city. Average DSL coverage in California is 0.00% versus 72.94% in Foster City.
What zip codes have DSL internet?
DSL internet coverage varies by zip code and neighborhood. Some examples in or around Foster City 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 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
- San Mateo, CA: less DSL coverage, slower speeds
- Belmont, CA: less DSL coverage, slower speeds
- San Carlos, CA: less DSL coverage, slower speeds
- Highlands-Baywood Park, CA: more DSL coverage, slower speeds
- Hillsborough, CA: more DSL coverage, slower speeds
- Redwood City, CA: more DSL coverage, slower speeds
- Burlingame, CA: more DSL coverage, slower speeds
- North Fair Oaks, CA: more DSL coverage, slower speeds
- Atherton, CA: more DSL coverage, slower speeds
- Menlo Park, CA: more DSL coverage, slower speeds
Cities with Similar Populations
- American Fork, UT: more DSL coverage, slower speeds
- Williston, ND: more DSL coverage, slower speeds
- Bell, CA: more DSL coverage, slower speeds
- Bethel Park, PA: less DSL coverage, slower speeds
- North Olmsted, OH: more DSL coverage, slower speeds
- Boardman, OH: more DSL coverage, slower speeds
- Boone, NC: more DSL coverage, slower speeds
- Bowling Green, OH: less DSL coverage, slower speeds
- Orangevale, CA: more DSL coverage, slower speeds
- Pearl, MS: more DSL coverage, slower speeds