% of Households with Broadband Internet, by Zip Code (ZCTA5) — California

NOTE: Gray indicates insufficient data or a suppressed estimate.

Broadband adoption rates are highest in the suburban zip codes ringing the San Francisco Bay Area and in portions of the Sacramento metro region, where many areas exceed 90–95% household penetration. In contrast, the rural eastern Sierra, parts of the northern interior, and several desert communities in San Bernardino and Imperial counties display markedly lower rates, with some zip codes falling below 50%. The Central Valley exhibits notable internal variation, with urban cores like Fresno and Bakersfield reaching moderate-to-high levels while surrounding agricultural zip codes lag significantly behind.

Data: U.S. Census Bureau, 2023 ACS

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