In Castle Hill there are 9 residential internet providers covering 100.00% of the city. The average home can get speeds up to 2,711 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.
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9 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
Availability maps for all providers in Castle Hill
Using the dropdown below, please select a provider. Green indicates nearly all homes have service, red indicates few homes have service, and blank indicates no service.
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Internet service is available in 100.00% of Castle Hill. Using our interactive availability map, you can compare service areas for different providers, we include fiber, cable, DSL, or fixed wireless internet service for all providers who offer it. You will notice that some providers might be listed multiple times for each service. If you find no providers cover the location you're looking at, you can opt for satellite service. The most widely available provider is XFINITY. Now you can call companies in Castle Hill with more confidence that they might be available.
How fast are internet speeds in Castle Hill?
The map below shows maximum internet speeds by area in Castle Hill.
Internet Speed Key
The average Castle Hill home can get up to 2,711 Mbps on their internet plan. For most people, the fastest download speed in the city is 5,000 Mbps, which 23.68% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 76.32% of homes can only purchase plans up to 2,000 Mbps. See the internet provider details below for info about their speed and coverage in Castle Hill.-->
What type of internet should I choose in Castle Hill?
The fastest internet for you may vary based on where in Castle Hill you live. If speed is your main concern, cable will be the fastest internet 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.
Internet Market Health in Castle Hill
Internet Competition Key
The map shows how competitive the Castle Hill internet service market is. Areas in green have more alternatives, areas in yellow have a few choices, and areas in red may have only one provider. More competition usually means faster speeds and better prices for you, the customer.
Below are quick facts on internet competition and market health in Castle Hill based on what connections the average home has availabile:
- Average number of internet service providers to a home: 8.2 (very healthy)
- Average types of service (fiber, cable, DSL, etc): 3.0 (very healthy)
- Average providers with broadband (25 Mbps+) speeds: 8.2 (very healthy)
Overall, competition is very healthy.
Castle Hill internet customers have the ability to buy internet service from 7 to 10 different providers, depending on where they live. For different types of service, Castle Hill homes have 3 options. The type(s) of service available are fixed wireless, cable, dsl, and fiber, though these may vary depending on the region within the city.
When it comes to broadband download speeds faster than 25 Mbps, the situation is similar. Castle Hill internet customers who want faster speeds have between 7 and 10 choices of companies offering speeds up to or over 25 Mbps.
More internet companies with faster speeds means fewer monopolies and better prices for customers. In promoting a free market for internet, Castle Hill is doing quite well.
TV & Internet 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.
XFINITY from Comcast Cable in Castle Hill, CA
XFINITY cable coverage
About 100.00%, or 152 people, have XFINITY cable internet available to them in the city. The company covers the entire Castle Hill area. XFINITY is one of the largest internet service providers internet service providers in the US, with internet service available in every corner of Castle Hill.
XFINITY from Comcast cable download speeds
XFINITY is above average when comparing download speeds to all other internet providers in Castle Hill. Versus other cable providers in the area, XFINITY cable is the fastest. There are no different maximum speeds throughout Castle Hill. The fastest plan anyone in Castle Hill can order from XFINITY goes up to 2,000 Mbps, and all Castle Hill customers can get this speed.
Show all download speeds
- 100.0% up to 2,000.0 Mbps
XFINITY from Comcast cable upload speeds
In Castle Hill 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 Castle Hill cable providers. XFINITY offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castle Hill is up to 250 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 250.0 Mbps
Astound Broadband Cable in Castle Hill, CA
Astound Broadband cable coverage
About 76.32%, or 116 people, have Astound Broadband cable 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 much of Castle Hill.
Astound Broadband cable download speeds
Astound Broadband is above average when comparing download speeds to all other internet providers in Castle Hill. Versus other cable providers in the area, Astound Broadband cable is the slowest. There are no different maximum speeds throughout Castle Hill. The fastest plan anyone in Castle Hill can order from Astound Broadband goes up to 1,500 Mbps, and all Castle Hill customers can get this speed.
Show all download speeds
- 100.0% up to 1,500.0 Mbps
Astound Broadband cable upload speeds
In Castle Hill 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 Castle Hill cable 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 50 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 50.0 Mbps
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
EarthLink Fiber in Castle Hill, CA
EarthLink fiber coverage
About 23.68%, or 36 people, have EarthLink fiber 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 a small portion of Castle Hill.
EarthLink fiber download speeds
EarthLink is one of the fastest when comparing download speeds to all other internet providers in Castle Hill. Versus other fiber providers in the area, EarthLink fiber is one of the fastest. There are no different maximum speeds throughout Castle Hill. The fastest plan anyone in Castle Hill can order from EarthLink goes up to 5,000 Mbps, and all Castle Hill customers can get this speed.
Show all download speeds
- 100.0% up to 5,000.0 Mbps
EarthLink fiber upload speeds
In Castle Hill 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 Castle Hill fiber 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 5,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 5,000.0 Mbps
AT&T Fiber in Castle Hill, CA
AT&T fiber coverage
About 23.68%, or 36 people, have AT&T fiber 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 a small portion of Castle Hill.
AT&T fiber download speeds
AT&T is one of the fastest when comparing download speeds to all other internet providers in Castle Hill. Versus other fiber providers in the area, AT&T fiber is one of the fastest. There are no different maximum speeds throughout Castle Hill. The fastest plan anyone in Castle Hill can order from AT&T goes up to 5,000 Mbps, and all Castle Hill customers can get this speed.
Show all download speeds
- 100.0% up to 5,000.0 Mbps
AT&T fiber upload speeds
In Castle Hill 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 Castle Hill fiber 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 5,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 5,000.0 Mbps
Unwired Fixed Wireless in Castle Hill, CA
Unwired fixed wireless coverage
About 100.00%, or 152 people, have Unwired fixed wireless internet available to them in the city. The company covers the entire Castle Hill area. Unwired is a large internet service provider internet service providers in the US, with internet service available in every corner of Castle Hill.
Unwired fixed wireless download speeds
Unwired is below average when comparing download speeds to all other internet providers in Castle Hill. Versus other fixed wireless providers in the area, Unwired fixed wireless is one of the fastest. There are no different maximum speeds throughout Castle Hill. The fastest plan anyone in Castle Hill can order from Unwired goes up to 300 Mbps, and all Castle Hill customers can get this speed.
Show all download speeds
- 100.0% up to 300.0 Mbps
Unwired fixed wireless upload speeds
In Castle Hill download speeds tend to be faster than than upload speeds for Unwired fixed wireless. Compared to other ISPs, Unwired is below average where upload speeds are concerned, and the fastest compared to other Castle Hill fixed wireless providers. Unwired offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castle Hill is up to 25 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 25.0 Mbps
T-Mobile Home Internet Fixed Wireless in Castle Hill, CA
T-Mobile Home Internet fixed wireless coverage
About 100.00%, or 152 people, have T-Mobile Home Internet fixed wireless internet available to them in the city. The company covers the entire Castle Hill area. T-Mobile Home Internet is one of the largest internet service providers internet service providers in the US, with internet service available in every corner of Castle Hill.
T-Mobile Home Internet fixed wireless download speeds
T-Mobile Home Internet is below average when comparing download speeds to all other internet providers in Castle Hill. Versus other fixed wireless providers in the area, T-Mobile Home Internet fixed wireless is below average. There are 2 different maximum speeds throughout Castle Hill. The fastest plan anyone in Castle Hill can order from T-Mobile Home Internet goes up to 100 Mbps, the slowest package only goes up to 25 Mbps, and the city-wide average maximum speed for Castle Hill customers is up to 72 Mbps.
Show all download speeds
- 62.5% up to 100.0 Mbps
- 37.5% up to 25.0 Mbps
T-Mobile Home Internet fixed wireless upload speeds
In Castle Hill download speeds tend to be faster than than upload speeds for T-Mobile Home Internet fixed wireless. Compared to other ISPs, T-Mobile Home Internet is below average where upload speeds are concerned, and average compared to other Castle Hill fixed wireless providers. T-Mobile Home Internet 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 Castle Hill is up to 20 Mbps. Some customers have slower plan choices, which only go up to 3.0 Mbps. On average, T-Mobile Home Internet customers can get speeds up to 14 Mbps.
Show all upload speeds
- 62.5% up to 20.0 Mbps
- 37.5% up to 3.0 Mbps
Verizon Fixed Wireless in Castle Hill, CA
Verizon fixed wireless coverage
About 76.32%, or 116 people, have Verizon fixed wireless internet available to them in the city. The company covers the entire Castle Hill area. Verizon is one of the largest internet service providers internet service providers in the US, with internet service available in much of Castle Hill.
Verizon fixed wireless download speeds
Verizon is below average when comparing download speeds to all other internet providers in Castle Hill. Versus other fixed wireless providers in the area, Verizon fixed wireless is one of the fastest. There are no different maximum speeds throughout Castle Hill. The fastest plan anyone in Castle Hill can order from Verizon goes up to 300 Mbps, and all Castle Hill customers can get this speed.
Show all download speeds
- 100.0% up to 300.0 Mbps
Verizon fixed wireless upload speeds
In Castle Hill download speeds tend to be faster than than upload speeds for Verizon fixed wireless. Compared to other ISPs, Verizon is below average where upload speeds are concerned, and above average compared to other Castle Hill fixed wireless providers. Verizon 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 Fixed Wireless in Castle Hill, CA
EarthLink fixed wireless coverage
About 62.50%, or 95 people, have EarthLink fixed wireless 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 a majority of Castle Hill.
EarthLink fixed wireless download speeds
EarthLink is one of the slowest when comparing download speeds to all other internet providers in Castle Hill. Versus other fixed wireless providers in the area, EarthLink fixed wireless 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 25 Mbps, and all Castle Hill customers can get this speed.
Show all download speeds
- 100.0% up to 25.0 Mbps
EarthLink fixed wireless upload speeds
In Castle Hill download speeds tend to be faster than than upload speeds for EarthLink fixed wireless. Compared to other ISPs, EarthLink is one of the slowest where upload speeds are concerned, and one of the slowest compared to other Castle Hill fixed wireless 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 3.0 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 3.0 Mbps
AT&T Fixed Wireless in Castle Hill, CA
AT&T fixed wireless coverage
About 62.50%, or 95 people, have AT&T fixed wireless 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 a majority of Castle Hill.
AT&T fixed wireless download speeds
AT&T is one of the slowest when comparing download speeds to all other internet providers in Castle Hill. Versus other fixed wireless providers in the area, AT&T fixed wireless 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 25 Mbps, and all Castle Hill customers can get this speed.
Show all download speeds
- 100.0% up to 25.0 Mbps
AT&T fixed wireless upload speeds
In Castle Hill download speeds tend to be faster than than upload speeds for AT&T fixed wireless. Compared to other ISPs, AT&T is one of the slowest where upload speeds are concerned, and one of the slowest compared to other Castle Hill fixed wireless 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 3.0 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 3.0 Mbps
Castle Hill Internet 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 internet in Castle Hill compare to the rest of California?
Internet speeds in Castle Hill are slower versus the average speeds in California: 3,631 Mbps in California versus 2,711 Mbps in the city. The state has similar internet availability compared to the city. Average internet coverage in California is 98.73% versus 100.00% in Castle Hill.
What zip codes have widespread internet?
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 internet service 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: less internet coverage, faster speeds
- Alamo, CA: equal internet coverage, faster speeds
- Lafayette, CA: less internet coverage, faster speeds
- Moraga, CA: less internet coverage, slower speeds
- Reliez Valley, CA: equal internet coverage, slower speeds
- Pleasant Hill, CA: less internet coverage, faster speeds
- Diablo, CA: less internet coverage, slower speeds
- Concord, CA: less internet coverage, faster speeds
- Orinda, CA: equal internet coverage, faster speeds
- Canyon, CA: less internet coverage, slower speeds
Cities with Similar Populations
- Ruth, CA: equal internet coverage, slower speeds
- Kenna, NM: less internet coverage, slower speeds
- Keota, CO: equal internet coverage, slower speeds
- Saude, IA: equal internet coverage, slower speeds
- Kimery, TN: equal internet coverage, slower speeds
- Saronville, NE: equal internet coverage, slower speeds
- Sargent, TX: less internet coverage, slower speeds
- Sapelo Island, GA: less internet coverage, faster speeds
- Sanger, ND: equal internet coverage, slower speeds
- Klahr, PA: equal internet coverage, slower speeds