In Castlemont there are 3 residential Fiber providers covering 95.99% of the neighborhood. The average home can get speeds up to 4,513 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 Castlemont, Oakland, CA.
To see availability maps for all providers including fiber, cable, DSL, and more in Castlemont, Oakland, CA please click below.
Castlemont, Oakland, CA Availability Maps
Fiber Internet Service Providers in Castlemont
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 Castlemont are not shown.
Castlemont 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 Castlemont is fiber internet available?
Fiber Internet Availability Key
Fiber is available in 95.99% of Castlemont. 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 Castlemont above to see who has service at your home.
How fast is fiber internet in Castlemont?
The map below shows maximum fiber internet speeds by area in Castlemont.
Fiber Internet Speed Key
The average Castlemont home can get up to 4,513 Mbps on their fiber internet plan. The fastest fiber download speed in the neighborhood is 5,000 Mbps, which 84.30% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 11.69% of homes can only purchase plans up to 1,000 Mbps. See the internet provider details below for info about their speed and coverage in Castlemont.
Fiber internet speeds tend to be faster in the north parts of Castlemont, and slower in the southeast areas of the neighborhood.
Is fiber the fastest internet I can get in Castlemont?
The fastest internet for you may vary based on where in Castlemont you live. In general, cable competes most often with fiber in the neighborhood.
- Fiber is the fastest internet type for 84.30% of Castlemont homes.
- Cable is fastest for 12.81% of the neighborhood.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for less than 1%.
- Satellite internet may be the only option for 2.89% of Castlemont homes.
Fiber Providers in Depth
Below you'll find which TV and internet providers offer service in Castlemont, along with details on where in Castlemont and at what speeds.
Sonic Fiber in Castlemont, Oakland, CA
Sonic fiber coverage
About 95.99%, or 5,748 people, have Sonic fiber internet available to them in the neighborhood. The company covers the entire Castlemont area. Sonic is a large internet service provider internet service providers in the US, with internet service available in most of Castlemont.
Sonic fiber download speeds
Sonic is below average when comparing download speeds to all other internet providers in Castlemont. Versus other fiber providers in the area, Sonic fiber is the slowest. There are no different maximum speeds throughout Castlemont. The fastest plan anyone in Castlemont can order from Sonic goes up to 1,000 Mbps, and all Castlemont customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
Sonic fiber upload speeds
In Castlemont download speeds tend to be equal to than upload speeds for Sonic fiber. Compared to other ISPs, Sonic is above average where upload speeds are concerned, and the slowest compared to other Castlemont fiber providers. Sonic offers no different upload speeds across the neighborhood. The fastest upload speed available to anyone from this ISP in Castlemont is up to 1,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1,000.0 Mbps
EarthLink Fiber in Castlemont, Oakland, CA
EarthLink fiber coverage
About 87.56%, or 5,243 people, have EarthLink fiber internet available to them in the neighborhood. The company covers the entire Castlemont area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in most of Castlemont.
EarthLink fiber download speeds
EarthLink is one of the fastest when comparing download speeds to all other internet providers in Castlemont. Versus other fiber providers in the area, EarthLink fiber is one of the fastest. There are 2 different maximum speeds throughout Castlemont. The fastest plan anyone in Castlemont can order from EarthLink goes up to 5,000 Mbps, the slowest package only goes up to 1,000 Mbps, and the neighborhood-wide average maximum speed for Castlemont customers is up to 4,851 Mbps.
Show all download speeds
- 96.3% up to 5,000.0 Mbps
- 3.7% up to 1,000.0 Mbps
EarthLink fiber upload speeds
In Castlemont 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 Castlemont fiber providers. EarthLink offers 2 different upload speeds across the neighborhood, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Castlemont is up to 5,000 Mbps. Some customers have slower plan choices, which only go up to 1,000 Mbps. On average, EarthLink customers can get speeds up to 4,851 Mbps.
Show all upload speeds
- 96.3% up to 5,000.0 Mbps
- 3.7% up to 1,000.0 Mbps
AT&T Fiber in Castlemont, Oakland, CA
AT&T fiber coverage
About 87.56%, or 5,243 people, have AT&T fiber internet available to them in the neighborhood. The company covers the entire Castlemont area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in most of Castlemont.
AT&T fiber download speeds
AT&T is one of the fastest when comparing download speeds to all other internet providers in Castlemont. Versus other fiber providers in the area, AT&T fiber is one of the fastest. There are 2 different maximum speeds throughout Castlemont. The fastest plan anyone in Castlemont can order from AT&T goes up to 5,000 Mbps, the slowest package only goes up to 1,000 Mbps, and the neighborhood-wide average maximum speed for Castlemont customers is up to 4,851 Mbps.
Show all download speeds
- 96.3% up to 5,000.0 Mbps
- 3.7% up to 1,000.0 Mbps
AT&T fiber upload speeds
In Castlemont 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 Castlemont fiber providers. AT&T offers 2 different upload speeds across the neighborhood, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Castlemont is up to 5,000 Mbps. Some customers have slower plan choices, which only go up to 1,000 Mbps. On average, AT&T customers can get speeds up to 4,851 Mbps.
Show all upload speeds
- 96.3% up to 5,000.0 Mbps
- 3.7% up to 1,000.0 Mbps
Castlemont Fiber by Area
This information is most helpful to those looking for homes or considering moving to Castlemont or any of the areas nearby.
How does fiber internet in Castlemont compare to the rest of Oakland?
Fiber internet speeds in Castlemont are much faster versus the average speeds in Oakland: 0.00 Mbps in Oakland versus 4,513 Mbps in the neighborhood. The city has similar fiber availability compared to the neighborhood. Average fiber coverage in Oakland is 0.00% versus 95.99% in Castlemont.
What zip codes have fiber internet?
Fiber internet coverage varies by zip code and neighborhood. Some examples in or around Castlemont 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 neighborhoods?
Below are neighborhoods nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Neighborhoods
- Cox, Oakland, CA: more fiber coverage, faster speeds
- Webster, Oakland, CA: more fiber coverage, faster speeds
- Iveywood, Oakland, CA: more fiber coverage, faster speeds
- Arroyo Viejo, Oakland, CA: more fiber coverage, faster speeds
- Highland, Oakland, CA: more fiber coverage, faster speeds
- Eastmont, Oakland, CA: more fiber coverage, faster speeds
- Elmhurst Park, Oakland, CA: more fiber coverage, faster speeds
- Durant Manor, Oakland, CA: less fiber coverage, faster speeds
- Fitchburg, Oakland, CA: more fiber coverage, faster speeds
- North Stonehurst, Oakland, CA: more fiber coverage, faster speeds
Neighborhoods with Similar Populations
- Dayton-Campbell Historic District, Hamilton, OH: more fiber coverage, slower speeds
- Regent Square, Pittsburgh, PA: more fiber coverage, slower speeds
- Kaisertown, Buffalo, NY: less fiber coverage, slower speeds
- Southwood Valley, College Station, TX: less fiber coverage, faster speeds
- Kirkmere, Youngstown, OH: less fiber coverage, slower speeds
- Lakewood, Ann Arbor, MI: less fiber coverage, faster speeds
- Lakewood Springs, Plano, IL: more fiber coverage, faster speeds
- Lockhill Estates, San Antonio, TX: more fiber coverage, faster speeds
- Pinellas Point, St. Petersburg, FL: less fiber coverage, faster speeds
- Tree Streets, Provo, UT: more fiber coverage, faster speeds