Antioch, California

2 ZIP codes · Pacific time

ZIP codes (largest first)

94509 · 70,09094531 · 46,387
Population116,477
StateCalifornia
CountyContra Costa County
Time zonePacific
Land area29.17 sq mi

Area codes in this area

925

These are the area codes that most often serve Antioch (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Find the ZIP+4 for an address in Antioch

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Population: U.S. Census Bureau, ACS 5-year estimates, 2024.