In Contra Costa County there are 2 residential Cable providers covering 99.28% of the county. The average home can get speeds up to 1,859 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 Contra Costa County, CA.
To see availability maps for all providers including fiber, cable, DSL, and more in Contra Costa County, CA please click below.
Contra Costa County, CA Availability Maps
Cable Internet Service Providers in Contra Costa County
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 Contra Costa County are not shown.
Contra Costa County 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 Contra Costa County is cable internet available?
Cable Internet Availability Key
Cable is available in 99.28% of Contra Costa County. 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 Contra Costa County above to see who has service at your home.
How fast is cable internet in Contra Costa County?
The map below shows maximum cable internet speeds by area in Contra Costa County.
Cable Internet Speed Key
The average Contra Costa County home can get up to 1,859 Mbps on their cable internet plan. The fastest cable download speed in the county is 2,000 Mbps, which 81.42% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 16.95% 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 Contra Costa County.
Cable internet speeds tend to be faster in the south parts of Contra Costa County, and slower in the southwest areas of the county.
Is cable the fastest internet I can get in Contra Costa County?
The fastest internet for you may vary based on where in Contra Costa County you live. In general, fiber competes most often with cable in the county.
- Fiber is the fastest internet type for 51.31% of Contra Costa County homes.
- Cable is fastest for 48.05% of the county.
- 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 Contra Costa County homes.
Cable Providers in Depth
Below you'll find which TV and internet providers offer service in Contra Costa County, along with details on where in Contra Costa County and at what speeds.
XFINITY from Comcast Cable in Contra Costa County, CA
XFINITY cable coverage
About 99.25%, or 1,157,176 people, have XFINITY cable internet available to them in the county. The company covers the entire Contra Costa County area. XFINITY is one of the largest internet service providers internet service providers in the US, with internet service available in most of Contra Costa County.
XFINITY from Comcast cable download speeds
XFINITY is above average when comparing download speeds to all other internet providers in Contra Costa County. Versus other cable providers in the area, XFINITY cable is the fastest. There are 2 different maximum speeds throughout Contra Costa County. The fastest plan anyone in Contra Costa County can order from XFINITY goes up to 2,000 Mbps, the slowest package only goes up to 1,200 Mbps, and the county-wide average maximum speed for Contra Costa County customers is up to 1,856 Mbps.
Show all download speeds
- 82.0% up to 2,000.0 Mbps
- 18.0% up to 1,200.0 Mbps
XFINITY from Comcast cable upload speeds
In Contra Costa County 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 Contra Costa County cable providers. XFINITY offers 3 different upload speeds across the county, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Contra Costa County is up to 2,000 Mbps. Some customers have slower plan choices, which only go up to 35 Mbps. On average, XFINITY customers can get speeds up to 261 Mbps.
Show all upload speeds
- 2.8% up to 2,000.0 Mbps
- 79.2% up to 250.0 Mbps
- 18.0% up to 35.0 Mbps
Astound Broadband Cable in Contra Costa County, CA
Astound Broadband cable coverage
About 21.60%, or 251,833 people, have Astound Broadband cable internet available to them in the county. The company covers the central, south, north, northwest, and east Contra Costa County area. Astound Broadband is one of the largest internet service providers internet service providers in the US, with internet service available in a small portion of Contra Costa County.
Astound Broadband cable download speeds
Astound Broadband is above average when comparing download speeds to all other internet providers in Contra Costa County. Versus other cable providers in the area, Astound Broadband cable is the slowest. There are no different maximum speeds throughout Contra Costa County. The fastest plan anyone in Contra Costa County can order from Astound Broadband goes up to 1,500 Mbps, and all Contra Costa County customers can get this speed.
Show all download speeds
- 100.0% up to 1,500.0 Mbps
Astound Broadband cable upload speeds
In Contra Costa County 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 Contra Costa County cable providers. Astound Broadband offers no different upload speeds across the county. The fastest upload speed available to anyone from this ISP in Contra Costa County is up to 50 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 50.0 Mbps
Contra Costa County Cable by Area
This information is most helpful to those looking for homes or considering moving to Contra Costa County or any of the areas nearby.
How does cable internet in Contra Costa County compare to the rest of California?
Cable internet speeds in Contra Costa County are much faster versus the average speeds in California: 0.00 Mbps in California versus 1,859 Mbps in the county. The state has similar cable availability compared to the county. Average cable coverage in California is 0.00% versus 99.28% in Contra Costa County.
What zip codes have cable internet?
Cable internet coverage varies by zip code and neighborhood. Some examples in or around Contra Costa County 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 counties?
Below are counties nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Counties
- Marin County, CA: less cable coverage, faster speeds
- San Joaquin County, CA: less cable coverage, slower speeds
- Tuolumne County, CA: less cable coverage, slower speeds
- San Miguel County, CO: less cable coverage, slower speeds
- Otero County, CO: less cable coverage, slower speeds
- Prowers County, CO: less cable coverage, slower speeds
- Finney County, KS: less cable coverage, faster speeds
- Hodgeman County, KS: less cable coverage, slower speeds
- Edwards County, KS: less cable coverage, faster speeds
- Reno County, KS: less cable coverage, faster speeds
Counties with Similar Populations
- Santa Clara County, CA: less cable coverage, slower speeds
- Wayne County, MI: more cable coverage, slower speeds
- Honolulu County, HI: less cable coverage, slower speeds
- Travis County, TX: less cable coverage, slower speeds
- Suffolk County, NY: less cable coverage, slower speeds
- Palm Beach County, FL: less cable coverage, slower speeds
- Oakland County, MI: more cable coverage, slower speeds
- Philadelphia County, PA: less cable coverage, faster speeds
- Pima County, AZ: less cable coverage, slower speeds
- Broward County, FL: less cable coverage, slower speeds