In Castle Hill there are 3 residential DSL providers covering 76.32% of the city. The average home can get speeds up to 558 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 Castle Hill, CA.
To see availability maps for all providers including fiber, cable, DSL, and more in Castle Hill, CA please click below.
Castle Hill, CA Availability Maps
DSL Internet Service Providers in Castle Hill
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 Castle Hill are not shown.
Castle Hill 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 Castle Hill is DSL internet available?
DSL Internet Availability Key
DSL is available in 76.32% of Castle Hill. Areas in green have DSL internet service, where areas in yellow or red may not. The most widely available provider is Astound Broadband. Call one of the companies with service in Castle Hill above to see who has service at your home.
How fast is DSL internet in Castle Hill?
The map below shows maximum DSL internet speeds by area in Castle Hill.
DSL Internet Speed Key
The average Castle Hill home can get up to 558 Mbps on their DSL internet plan. The fastest DSL download speed in the city is 1,000 Mbps, which 38.82% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 37.50% of homes can only purchase plans up to 100 Mbps. See the internet provider details below for info about their speed and coverage in Castle Hill.
Is DSL the fastest internet I can get in Castle Hill?
The fastest internet for you may vary based on where in Castle Hill you live. In general, cable competes most often with DSL in the city.
- Fiber is the fastest internet type for 23.68% of Castle Hill homes.
- Cable is fastest for 76.32% 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 Castle Hill homes.
DSL Providers in Depth
Below you'll find which TV and internet providers offer service in Castle Hill, along with details on where in Castle Hill and at what speeds.
AT&T DSL in Castle Hill, CA
AT&T DSL coverage
About 76.32%, or 116 people, have AT&T DSL internet available to them in the city. The company covers the entire Castle Hill area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in much of Castle Hill.
AT&T DSL download speeds
AT&T is below average when comparing download speeds to all other internet providers in Castle Hill. Versus other DSL providers in the area, AT&T DSL is one of the slowest. There are no different maximum speeds throughout Castle Hill. The fastest plan anyone in Castle Hill can order from AT&T goes up to 100 Mbps, and all Castle Hill customers can get this speed.
Show all download speeds
- 100.0% up to 100.0 Mbps
AT&T DSL upload speeds
In Castle Hill 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 fastest compared to other Castle Hill DSL providers. AT&T offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castle Hill is up to 20 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 20.0 Mbps
EarthLink DSL in Castle Hill, CA
EarthLink DSL coverage
About 76.32%, or 116 people, have EarthLink DSL internet available to them in the city. The company covers the entire Castle Hill area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in much of Castle Hill.
EarthLink DSL download speeds
EarthLink is below average when comparing download speeds to all other internet providers in Castle Hill. Versus other DSL providers in the area, EarthLink DSL is one of the slowest. There are no different maximum speeds throughout Castle Hill. The fastest plan anyone in Castle Hill can order from EarthLink goes up to 100 Mbps, and all Castle Hill customers can get this speed.
Show all download speeds
- 100.0% up to 100.0 Mbps
EarthLink DSL upload speeds
In Castle Hill 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 fastest compared to other Castle Hill DSL providers. EarthLink offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castle Hill is up to 20 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 20.0 Mbps
Astound Broadband DSL in Castle Hill, CA
Astound Broadband DSL coverage
About 38.82%, or 59 people, have Astound Broadband DSL internet available to them in the city. The company covers the entire Castle Hill area. Astound Broadband is one of the largest internet service providers internet service providers in the US, with internet service available in some of Castle Hill.
Astound Broadband DSL download speeds
Astound Broadband is below average when comparing download speeds to all other internet providers in Castle Hill. Versus other DSL providers in the area, Astound Broadband DSL is the fastest. There are no different maximum speeds throughout Castle Hill. The fastest plan anyone in Castle Hill can order from Astound Broadband goes up to 1,000 Mbps, and all Castle Hill customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
Astound Broadband DSL upload speeds
In Castle Hill 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 the slowest compared to other Castle Hill DSL providers. Astound Broadband offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castle Hill is up to 10 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 10.0 Mbps
Castle Hill DSL by Area
This information is most helpful to those looking for homes or considering moving to Castle Hill or any of the areas nearby.
How does DSL internet in Castle Hill compare to the rest of California?
DSL internet speeds in Castle Hill are much faster versus the average speeds in California: 0.00 Mbps in California versus 558 Mbps in the city. The state has similar DSL availability compared to the city. Average DSL coverage in California is 0.00% versus 76.32% in Castle Hill.
What zip codes have DSL internet?
DSL internet coverage varies by zip code and neighborhood. Some examples in or around Castle Hill 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
- Walnut Creek, CA: more DSL coverage, slower speeds
- Alamo, CA: more DSL coverage, slower speeds
- Lafayette, CA: more DSL coverage, slower speeds
- Moraga, CA: more DSL coverage, slower speeds
- Reliez Valley, CA: less DSL coverage, slower speeds
- Pleasant Hill, CA: more DSL coverage, slower speeds
- Diablo, CA: more DSL coverage, slower speeds
- Concord, CA: more DSL coverage, slower speeds
- Orinda, CA: less DSL coverage, slower speeds
- Canyon, CA: less DSL coverage, slower speeds
Cities with Similar Populations
- Ruth, CA: less DSL coverage, slower speeds
- Kenna, NM: less DSL coverage, slower speeds
- Saude, IA: more DSL coverage, slower speeds
- Kimery, TN: less DSL coverage, slower speeds
- Saronville, NE: less DSL coverage, slower speeds
- Sargent, TX: less DSL coverage, slower speeds
- Sapelo Island, GA: less DSL coverage, slower speeds
- Klahr, PA: more DSL coverage, slower speeds
- Sand Bay, WI: more DSL coverage, slower speeds
- Sagerton, TX: less DSL coverage, slower speeds