In Alameda County there are 4 residential Fiber providers covering 71.54% of the county. The average home can get speeds up to 6,791 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 Alameda County, CA.
To see availability maps for all providers including fiber, cable, DSL, and more in Alameda County, CA please click below.
Alameda County, CA Availability Maps
Fiber Internet Service Providers in Alameda 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 Alameda County are not shown.
Alameda 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 Alameda County is fiber internet available?
Fiber Internet Availability Key
Fiber is available in 71.54% of Alameda County. Areas in green have fiber internet service, where areas in yellow or red may not. The most widely available provider is Sonic. Call one of the companies with service in Alameda County above to see who has service at your home.
How fast is fiber internet in Alameda County?
The map below shows maximum fiber internet speeds by area in Alameda County.
Fiber Internet Speed Key
The average Alameda County home can get up to 6,791 Mbps on their fiber internet plan. The fastest fiber download speed in the county is 10,000 Mbps, which 32.43% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, less than 1% of homes can only purchase plans up to 10 Mbps. See the internet provider details below for info about their speed and coverage in Alameda County.
Fiber internet speeds tend to be faster in the north parts of Alameda County, and slower in the east areas of the county.
Is fiber the fastest internet I can get in Alameda County?
The fastest internet for you may vary based on where in Alameda County you live. In general, cable competes most often with fiber in the county.
- Fiber is the fastest internet type for 63.22% of Alameda County homes.
- Cable is fastest for 35.08% 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 1.42% of Alameda County homes.
Fiber Providers in Depth
Below you'll find which TV and internet providers offer service in Alameda County, along with details on where in Alameda County and at what speeds.
EarthLink Fiber in Alameda County, CA
EarthLink fiber coverage
About 63.88%, or 1,074,618 people, have EarthLink fiber internet available to them in the county. The company covers the northwest, central, southeast, south, east, north, and west Alameda County area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in a majority of Alameda County.
EarthLink fiber download speeds
EarthLink is above average when comparing download speeds to all other internet providers in Alameda County. Versus other fiber providers in the area, EarthLink fiber is above average. There are 3 different maximum speeds throughout Alameda County. The fastest plan anyone in Alameda County can order from EarthLink goes up to 5,000 Mbps, the slowest package only goes up to 10 Mbps, and the county-wide average maximum speed for Alameda County customers is up to 4,584 Mbps.
Show all download speeds
- 89.6% up to 5,000.0 Mbps
- 10.4% up to 1,000.0 Mbps
- 0.0% up to 10.0 Mbps
EarthLink fiber upload speeds
In Alameda County download speeds tend to be faster than than upload speeds for EarthLink fiber. Compared to other ISPs, EarthLink is above average where upload speeds are concerned, and above average compared to other Alameda County fiber providers. EarthLink 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 Alameda County is up to 5,000 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, EarthLink customers can get speeds up to 4,584 Mbps.
Show all upload speeds
- 89.6% up to 5,000.0 Mbps
- 10.4% up to 1,000.0 Mbps
- 0.0% up to 1.0 Mbps
AT&T Fiber in Alameda County, CA
AT&T fiber coverage
About 63.88%, or 1,074,618 people, have AT&T fiber internet available to them in the county. The company covers the northwest, central, southeast, south, east, north, and west Alameda County 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 Alameda County.
AT&T fiber download speeds
AT&T is above average when comparing download speeds to all other internet providers in Alameda County. Versus other fiber providers in the area, AT&T fiber is above average. There are 3 different maximum speeds throughout Alameda County. The fastest plan anyone in Alameda County can order from AT&T goes up to 5,000 Mbps, the slowest package only goes up to 10 Mbps, and the county-wide average maximum speed for Alameda County customers is up to 4,584 Mbps.
Show all download speeds
- 89.6% up to 5,000.0 Mbps
- 10.4% up to 1,000.0 Mbps
- 0.0% up to 10.0 Mbps
AT&T fiber upload speeds
In Alameda County download speeds tend to be faster than than upload speeds for AT&T fiber. Compared to other ISPs, AT&T is above average where upload speeds are concerned, and above average compared to other Alameda County fiber providers. AT&T 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 Alameda County is up to 5,000 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, AT&T customers can get speeds up to 4,584 Mbps.
Show all upload speeds
- 89.6% up to 5,000.0 Mbps
- 10.4% up to 1,000.0 Mbps
- 0.0% up to 1.0 Mbps
Sonic Fiber in Alameda County, CA
Sonic fiber coverage
About 43.67%, or 734,739 people, have Sonic fiber internet available to them in the county. The company covers the northwest, central, north, south, west, and southeast Alameda County area. Sonic is a large internet service provider internet service providers in the US, with internet service available in some of Alameda County.
Sonic fiber download speeds
Sonic is above average when comparing download speeds to all other internet providers in Alameda County. Versus other fiber providers in the area, Sonic fiber is above average. There are 2 different maximum speeds throughout Alameda County. The fastest plan anyone in Alameda County can order from Sonic goes up to 10,000 Mbps, the slowest package only goes up to 1,000 Mbps, and the county-wide average maximum speed for Alameda County customers is up to 7,683 Mbps.
Show all download speeds
- 74.3% up to 10,000.0 Mbps
- 25.7% up to 1,000.0 Mbps
Sonic fiber upload speeds
In Alameda County 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 above average compared to other Alameda County fiber providers. Sonic offers 2 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 Alameda County is up to 10,000 Mbps. Some customers have slower plan choices, which only go up to 1,000 Mbps. On average, Sonic customers can get speeds up to 7,683 Mbps.
Show all upload speeds
- 74.3% up to 10,000.0 Mbps
- 25.7% up to 1,000.0 Mbps
XFINITY from Comcast Fiber in Alameda County, CA
XFINITY fiber coverage
About 1.82%, or 30,574 people, have XFINITY fiber internet available to them in the county. The company covers the east, northwest, south, and southeast Alameda County area. XFINITY is one of the largest internet service providers internet service providers in the US, with internet service available in a very small piece of Alameda County.
XFINITY from Comcast fiber download speeds
XFINITY is average when comparing download speeds to all other internet providers in Alameda County. Versus other fiber providers in the area, XFINITY fiber is below average. There are 3 different maximum speeds throughout Alameda County. The fastest plan anyone in Alameda County can order from XFINITY goes up to 2,000 Mbps, the slowest package only goes up to 1,000 Mbps, and the county-wide average maximum speed for Alameda County customers is up to 1,488 Mbps.
Show all download speeds
- 37.7% up to 2,000.0 Mbps
- 55.6% up to 1,200.0 Mbps
- 6.7% up to 1,000.0 Mbps
XFINITY from Comcast fiber upload speeds
In Alameda County download speeds tend to be faster than than upload speeds for XFINITY fiber. Compared to other ISPs, XFINITY is below average where upload speeds are concerned, and the slowest compared to other Alameda County fiber providers. XFINITY offers 4 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 Alameda 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 302 Mbps.
Show all upload speeds
- 4.1% up to 2,000.0 Mbps
- 12.9% up to 1,000.0 Mbps
- 28.8% up to 250.0 Mbps
- 54.2% up to 35.0 Mbps
Alameda County Fiber by Area
This information is most helpful to those looking for homes or considering moving to Alameda County or any of the areas nearby.
How does fiber internet in Alameda County compare to the rest of California?
Fiber internet speeds in Alameda County are much faster versus the average speeds in California: 0.00 Mbps in California versus 6,791 Mbps in the county. The state has similar fiber availability compared to the county. Average fiber coverage in California is 0.00% versus 71.54% in Alameda County.
What zip codes have fiber internet?
Fiber internet coverage varies by zip code and neighborhood. Some examples in or around Alameda County 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 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
- San Francisco County, CA: less fiber coverage, slower speeds
- Stanislaus County, CA: less fiber coverage, slower speeds
- Mono County, CA: less fiber coverage, slower speeds
- Esmeralda County, NV: less fiber coverage, slower speeds
- Lincoln County, NV: less fiber coverage, slower speeds
- Iron County, UT: more fiber coverage, slower speeds
- Garfield County, UT: more fiber coverage, slower speeds
- Dolores County, CO: more fiber coverage, slower speeds
- San Juan County, CO: more fiber coverage, slower speeds
- Mineral County, CO: more fiber coverage, slower speeds
Counties with Similar Populations
- Santa Clara County, CA: less fiber coverage, slower speeds
- Riverside County, CA: more fiber coverage, slower speeds
- San Bernardino County, CA: less fiber coverage, slower speeds
- Pima County, AZ: less fiber coverage, slower speeds
- Travis County, TX: more fiber coverage, slower speeds
- Sacramento County, CA: less fiber coverage, slower speeds
- Contra Costa County, CA: less fiber coverage, slower speeds
- Clark County, NV: less fiber coverage, slower speeds
- Broward County, FL: more fiber coverage, slower speeds
- Honolulu County, HI: more fiber coverage, slower speeds