In Castro Valley there is 1 residential Cable provider covering 98.62% of the city. The average home can get speeds up to 1,954 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 Cable internet providers in Castro Valley, CA.
To see availability maps for all providers including fiber, cable, DSL, and more in Castro Valley, CA please click below.
Castro Valley, CA Availability Maps
Cable Internet Service Provider in Castro Valley
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 Castro Valley are not shown.
Castro Valley 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 Castro Valley is cable internet available?
Cable Internet Availability Key
Cable is available in 98.62% of Castro Valley. Areas in green have cable internet service, where areas in yellow or red may not. The most widely available provider is XFINITY. Call one of the companies with service in Castro Valley above to see who has service at your home.
How fast is cable internet in Castro Valley?
The map below shows maximum cable internet speeds by area in Castro Valley.
Cable Internet Speed Key
The average Castro Valley home can get up to 1,954 Mbps on their cable internet plan. The fastest cable download speed in the city is 2,000 Mbps, which 93.00% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 5.62% of homes can only purchase plans up to 1,200 Mbps. See the internet provider details below for info about their speed and coverage in Castro Valley.
Cable internet speeds tend to be faster in the north parts of Castro Valley, and slower in the south areas of the city.
Is cable the fastest internet I can get in Castro Valley?
The fastest internet for you may vary based on where in Castro Valley you live. In general, fiber competes most often with cable in the city.
- Fiber is the fastest internet type for 83.62% of Castro Valley homes.
- Cable is fastest for 15.00% 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 Castro Valley homes.
Cable Providers in Depth
Below you'll find which TV and internet providers offer service in Castro Valley, along with details on where in Castro Valley and at what speeds.
XFINITY from Comcast Cable in Castro Valley, CA
XFINITY cable coverage
About 98.62%, or 64,300 people, have XFINITY cable internet available to them in the city. The company covers the entire Castro Valley area. XFINITY is one of the largest internet service providers internet service providers in the US, with internet service available in most of Castro Valley.
XFINITY from Comcast cable download speeds
XFINITY is above average when comparing download speeds to all other internet providers in Castro Valley. Versus other cable providers in the area, XFINITY cable is the fastest. There are 2 different maximum speeds throughout Castro Valley. The fastest plan anyone in Castro Valley can order from XFINITY goes up to 2,000 Mbps, the slowest package only goes up to 1,200 Mbps, and the city-wide average maximum speed for Castro Valley customers is up to 1,954 Mbps.
Show all download speeds
- 94.3% up to 2,000.0 Mbps
- 5.7% up to 1,200.0 Mbps
XFINITY from Comcast cable upload speeds
In Castro Valley 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 Castro Valley cable providers. XFINITY 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 Castro Valley is up to 250 Mbps. Some customers have slower plan choices, which only go up to 35 Mbps. On average, XFINITY customers can get speeds up to 238 Mbps.
Show all upload speeds
- 94.3% up to 250.0 Mbps
- 5.7% up to 35.0 Mbps
Castro Valley Cable by Area
This information is most helpful to those looking for homes or considering moving to Castro Valley or any of the areas nearby.
How does cable internet in Castro Valley compare to the rest of California?
Cable internet speeds in Castro Valley are much faster versus the average speeds in California: 0.00 Mbps in California versus 1,954 Mbps in the city. The state has similar cable availability compared to the city. Average cable coverage in California is 0.00% versus 98.62% in Castro Valley.
What zip codes have cable internet?
Cable internet coverage varies by zip code and neighborhood. Some examples in or around Castro Valley are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does cable 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
- Fairview, CA: more cable coverage, slower speeds
- Ashland, CA: more cable coverage, slower speeds
- Cherryland, CA: more cable coverage, slower speeds
- San Lorenzo, CA: less cable coverage, faster speeds
- Hayward, CA: more cable coverage, slower speeds
- San Leandro, CA: more cable coverage, slower speeds
- San Ramon, CA: more cable coverage, faster speeds
- Dublin, CA: less cable coverage, faster speeds
- Danville, CA: more cable coverage, slower speeds
- Oakland, CA: less cable coverage, slower speeds
Cities with Similar Populations
- Clermont, FL: less cable coverage, slower speeds
- Martinsburg, WV: more cable coverage, slower speeds
- Brentwood, CA: more cable coverage, slower speeds
- Burnsville, MN: more cable coverage, slower speeds
- Casper, WY: less cable coverage, slower speeds
- La Habra, CA: more cable coverage, slower speeds
- Niagara Falls, NY: more cable coverage, slower speeds
- Hanford, CA: less cable coverage, slower speeds
- Powder Springs, GA: more cable coverage, faster speeds
- Mayaguez, PR: less cable coverage, slower speeds