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These figures are household adoption (how many homes subscribe to broadband), from the Census ACS. They are not provider or technology availability — that FCC data layer is a later addition. Nothing here is address-specific.

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Internet Access in Castro Valley, CA

22,021 households · Census ACS 5-year.

Broadband subscription
96.7%
California 93.5%
Any internet subscription
96.7%
No internet access
2.5%
California 4.6%
Households
22,021

Similar-size cities in California

AreaBroadbandNo internet
South San Francisco · CA95.6%3.4%Santa Cruz · CA95.5%1.9%Brentwood · CA96.6%2.1%Union City · CA95.1%3.7%Santee · CA95.3%3.5%San Rafael · CA94.6%3.6%

Source: U.S. Census Bureau, American Community Survey 5-year, table B28002. Subscription adoption, not provider or speed availability; not address-specific.

Internet Access in Castro Valley, CA | BroadbandAtlasUSA