AT&T internet in Castro Valley, CA
AT&T reports service to about 93% of residential locations in Castro Valley, California, which ranks it #2 of 8 providers with meaningful coverage. AT&T sells home internet over fiber (AT&T Fiber), older DSL lines, and a fixed wireless service called Internet Air. Which one you can get depends on your address, and fiber is only available in parts of its footprint.
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How AT&T compares in Castro Valley
| # | Provider | Technology (varies by address) | Locations covered |
|---|---|---|---|
| 1 | Xfinity | Cable | 99% |
| 2 | AT&T | Fiber, DSL, Fixed wireless | 93% |
| 3 | T-Mobile Home Internet | Fixed wireless | 80% |
| 4 | Verizon | Fiber, Fixed wireless | 65% |
| 5 | Etheric Communications | Fixed wireless | 54% |
| 6 | Sonic Telecom | Fiber | 46% |
| 7 | Unwired | Fixed wireless | 34% |
| 8 | California Internet | Fixed wireless | 4% |
Share of residential locations in Castro Valley where each provider reports service (FCC National Broadband Map, data as of December 31, 2025). See all providers in Castro Valley.
AT&T vs other providers
What technologies are available in Castro Valley?
Fiber is widely available: about 72% of locations in Castro Valley can get it. Gigabit-class service (1,000 Mbps down) is reported for about 96% of locations. DSL is still reported for about 52% of locations, which can be a fallback where fiber and cable do not reach. Fixed wireless home internet is reported for about 92% of locations.
FCC National Broadband Map, data as of December 31, 2025: share of residential locations in Castro Valley that providers report they can serve. City-level figures, not your address.
AT&T in places near Castro Valley
- Cherryland, CA (89%)
- Ashland, CA (85%)
- San Lorenzo, CA (95%)
- San Leandro, CA (93%)
- Hayward, CA (84%)
- Union City, CA (84%)
- San Ramon, CA (88%)
- Danville, CA (98%)
Plans and pricing
Plan prices and promotions change often and vary by address, so we do not list them. See AT&T's current offers at your address with its availability checker above.
Frequently asked questions
Is AT&T available in Castro Valley?
AT&T reports service to about 93% of residential locations in Castro Valley, per FCC data as of December 31, 2025. That ranks it #2 of 8 providers with meaningful coverage here. Availability depends on your exact address.
What type of internet does AT&T offer in Castro Valley?
AT&T offers fiber, dsl, fixed wireless service across its footprint. The FCC summary does not say which technology reaches each address, so check your address with the provider.
Who are the main AT&T competitors in Castro Valley?
Other providers reporting at least 10% coverage in Castro Valley include Xfinity (99%), T-Mobile Home Internet (80%), Verizon (65%), Etheric Communications (54%).
How do I check AT&T availability at my address?
Use AT&T's own address checker, or enter your ZIP code here to compare all providers for your area.
Compare all providers for your ZIP code
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