In 91978 there are 3 residential Fiber providers covering 25.51% of the zip. The average home can get speeds up to 4,271 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 91978, CA.
To see availability maps for all providers including fiber, cable, DSL, and more in 91978, CA please click below.
Fiber Internet Service Providers in 91978
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 91978 are not shown.
91978 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 91978 is fiber internet available?
Fiber Internet Availability Key
Fiber is available in 25.51% of 91978. 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 91978 above to see who has service at your home.
How fast is fiber internet in 91978?
The map below shows maximum fiber internet speeds by area in 91978.
Fiber Internet Speed Key
The average 91978 home can get up to 4,271 Mbps on their fiber internet plan. The fastest fiber download speed in the zip is 5,000 Mbps, which 20.86% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 4.65% 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 91978.
Fiber internet speeds tend to be faster in the west parts of 91978, and slower in the north areas of the zip.
Is fiber the fastest internet I can get in 91978?
The fastest internet for you may vary based on where in 91978 you live. In general, cable competes most often with fiber in the zip.
- Fiber is the fastest internet type for 20.86% of 91978 homes.
- Cable is fastest for 75.55% of the zip.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for 3.32%.
- Satellite internet may be the only option for less than 1% of 91978 homes.
Fiber Providers in Depth
Below you'll find which TV and internet providers offer service in 91978, along with details on where in 91978 and at what speeds.
EarthLink Fiber in 91978, CA
EarthLink fiber coverage
About 25.51%, or 2,657 people, have EarthLink fiber internet available to them in the zip. The company covers the northwest, west, and north 91978 area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in a small portion of 91978.
EarthLink fiber download speeds
EarthLink is one of the fastest when comparing download speeds to all other internet providers in 91978. Versus other fiber providers in the area, EarthLink fiber is one of the fastest. There are 2 different maximum speeds throughout 91978. The fastest plan anyone in 91978 can order from EarthLink goes up to 5,000 Mbps, the slowest package only goes up to 1,000 Mbps, and the zip-wide average maximum speed for 91978 customers is up to 4,271 Mbps.
Show all download speeds
- 81.8% up to 5,000.0 Mbps
- 18.2% up to 1,000.0 Mbps
EarthLink fiber upload speeds
In 91978 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 91978 fiber providers. EarthLink offers 2 different upload speeds across the zip, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in 91978 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 4,271 Mbps.
Show all upload speeds
- 81.8% up to 5,000.0 Mbps
- 18.2% up to 1,000.0 Mbps
AT&T Fiber in 91978, CA
AT&T fiber coverage
About 25.51%, or 2,657 people, have AT&T fiber internet available to them in the zip. The company covers the northwest, west, and north 91978 area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in a small portion of 91978.
AT&T fiber download speeds
AT&T is one of the fastest when comparing download speeds to all other internet providers in 91978. Versus other fiber providers in the area, AT&T fiber is one of the fastest. There are 2 different maximum speeds throughout 91978. The fastest plan anyone in 91978 can order from AT&T goes up to 5,000 Mbps, the slowest package only goes up to 1,000 Mbps, and the zip-wide average maximum speed for 91978 customers is up to 4,271 Mbps.
Show all download speeds
- 81.8% up to 5,000.0 Mbps
- 18.2% up to 1,000.0 Mbps
AT&T fiber upload speeds
In 91978 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 91978 fiber providers. AT&T offers 2 different upload speeds across the zip, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in 91978 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 4,271 Mbps.
Show all upload speeds
- 81.8% up to 5,000.0 Mbps
- 18.2% up to 1,000.0 Mbps
Cox Communications Fiber in 91978, CA
Cox fiber coverage
About 3.48%, or 362 people, have Cox fiber internet available to them in the zip. The company covers the west 91978 area. Cox is one of the largest internet service providers internet service providers in the US, with internet service available in a very small piece of 91978.
Cox Communications fiber download speeds
Cox is above average when comparing download speeds to all other internet providers in 91978. Versus other fiber providers in the area, Cox fiber is the slowest. There are no different maximum speeds throughout 91978. The fastest plan anyone in 91978 can order from Cox goes up to 2,000 Mbps, and all 91978 customers can get this speed.
Show all download speeds
- 100.0% up to 2,000.0 Mbps
Cox Communications fiber upload speeds
In 91978 download speeds tend to be faster than than upload speeds for Cox fiber. Compared to other ISPs, Cox is below average where upload speeds are concerned, and the slowest compared to other 91978 fiber providers. Cox offers no different upload speeds across the zip. The fastest upload speed available to anyone from this ISP in 91978 is up to 100 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 100.0 Mbps
91978 Fiber by Area
This information is most helpful to those looking for homes or considering moving to 91978 or any of the areas nearby.
How does fiber internet in 91978 compare to the rest of California?
Fiber internet speeds in 91978 are much faster versus the average speeds in California: 0.00 Mbps in California versus 4,271 Mbps in the zip. The state has similar fiber availability compared to the zip. Average fiber coverage in California is 0.00% versus 25.51% in 91978.
What zip codes have fiber internet?
Fiber internet coverage varies by zip code and neighborhood. Some examples in or around 91978 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 zip codes?
Below are zip codes nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Zip Codes
- 91977, CA: more fiber coverage, faster speeds
- 91941, CA: more fiber coverage, faster speeds
- 92019, CA: more fiber coverage, faster speeds
- 92020, CA: more fiber coverage, faster speeds
- 91945, CA: more fiber coverage, faster speeds
- 91914, CA: more fiber coverage, faster speeds
- 91942, CA: more fiber coverage, faster speeds
- 92114, CA: more fiber coverage, faster speeds
- 91902, CA: more fiber coverage, slower speeds
- 92139, CA: more fiber coverage, faster speeds
Zip Codes with Similar Populations
- 08628, NJ: more fiber coverage, slower speeds
- 17702, PA: more fiber coverage, faster speeds
- 18447, PA: more fiber coverage, faster speeds
- 15224, PA: more fiber coverage, slower speeds
- 13357, NY: less fiber coverage, slower speeds
- 13165, NY: more fiber coverage, slower speeds
- 12202, NY: less fiber coverage, slower speeds
- 11023, NY: more fiber coverage, faster speeds
- 10709, NY: more fiber coverage, faster speeds
- 10005, NY: more fiber coverage, slower speeds