In Castaic there are 2 residential Fiber providers covering 11.44% of the city. The average home can get speeds up to 5,000 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 Fiber internet providers in Castaic, CA.
To see availability maps for all providers including fiber, cable, DSL, and more in Castaic, CA please click below.
Fiber Internet Service Providers in Castaic
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 Castaic are not shown.
Castaic 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 Castaic is fiber internet available?
Fiber Internet Availability Key
Fiber is available in 11.44% of Castaic. Areas in green have fiber 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 Castaic above to see who has service at your home.
How fast is fiber internet in Castaic?
The map below shows maximum fiber internet speeds by area in Castaic.
Fiber Internet Speed Key
The average Castaic home can get up to 5,000 Mbps on their fiber internet plan. The fastest fiber download speed in the city is 5,000 Mbps, which 11.44% of residents can get.
Is fiber the fastest internet I can get in Castaic?
The fastest internet for you may vary based on where in Castaic you live. In general, cable competes most often with fiber in the city.
- Fiber is the fastest internet type for 11.44% of Castaic homes.
- Cable is fastest for 63.07% of the city.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for 2.12%.
- Satellite internet may be the only option for 22.83% of Castaic homes.
Fiber Providers in Depth
Below you'll find which TV and internet providers offer service in Castaic, along with details on where in Castaic and at what speeds.
EarthLink Fiber in Castaic, CA
EarthLink fiber coverage
About 11.44%, or 3,288 people, have EarthLink fiber internet available to them in the city. The company covers the south and southeast Castaic area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in a very small piece of Castaic.
EarthLink fiber download speeds
EarthLink is one of the fastest when comparing download speeds to all other internet providers in Castaic. Versus other fiber providers in the area, EarthLink fiber is one of the fastest. There are no different maximum speeds throughout Castaic. The fastest plan anyone in Castaic can order from EarthLink goes up to 5,000 Mbps, and all Castaic customers can get this speed.
Show all download speeds
- 100.0% up to 5,000.0 Mbps
EarthLink fiber upload speeds
In Castaic 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 Castaic fiber providers. EarthLink offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castaic 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 Castaic, CA
AT&T fiber coverage
About 11.44%, or 3,288 people, have AT&T fiber internet available to them in the city. The company covers the south and southeast Castaic area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in a very small piece of Castaic.
AT&T fiber download speeds
AT&T is one of the fastest when comparing download speeds to all other internet providers in Castaic. Versus other fiber providers in the area, AT&T fiber is one of the fastest. There are no different maximum speeds throughout Castaic. The fastest plan anyone in Castaic can order from AT&T goes up to 5,000 Mbps, and all Castaic customers can get this speed.
Show all download speeds
- 100.0% up to 5,000.0 Mbps
AT&T fiber upload speeds
In Castaic 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 Castaic fiber providers. AT&T offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castaic is up to 5,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 5,000.0 Mbps
Castaic Fiber by Area
This information is most helpful to those looking for homes or considering moving to Castaic or any of the areas nearby.
How does fiber internet in Castaic compare to the rest of California?
Fiber internet speeds in Castaic are much faster versus the average speeds in California: 0.00 Mbps in California versus 5,000 Mbps in the city. The state has similar fiber availability compared to the city. Average fiber coverage in California is 0.00% versus 11.44% in Castaic.
What zip codes have fiber internet?
Fiber internet coverage varies by zip code and neighborhood. Some examples in or around Castaic are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does fiber 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
- Valencia, CA: more fiber coverage, slower speeds
- Santa Clarita, CA: more fiber coverage, slower speeds
- Stevenson Ranch, CA: more fiber coverage, slower speeds
- Newhall, CA: more fiber coverage, slower speeds
- Piru, CA: more fiber coverage, slower speeds
- Canyon Country, CA: more fiber coverage, slower speeds
- Sylmar, CA: more fiber coverage, faster speeds
- Fillmore, CA: less fiber coverage, slower speeds
- Santa Paula, CA: more fiber coverage, faster speeds
- Sulphur Springs, CA: less fiber coverage, faster speeds
Cities with Similar Populations
- Zionsville, IN: more fiber coverage, slower speeds
- Miccosukee Cpo, FL: more fiber coverage, faster speeds
- Maryland Heights, MO: more fiber coverage, faster speeds
- Uniondale, NY: more fiber coverage, faster speeds
- Collinsville, IL: more fiber coverage, faster speeds
- Magna, UT: more fiber coverage, faster speeds
- Waynesboro, VA: more fiber coverage, slower speeds
- Wellesley, MA: more fiber coverage, slower speeds
- West Springfield Town, MA: more fiber coverage, slower speeds
- Wilmette, IL: more fiber coverage, slower speeds