Find the last 4 digits (ZIP+4) for an address in 94509

ZIP 94509, Antioch, CA is filled in. Just type the street address.

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ZIP Code 94509 – Antioch, CA

Antioch, California · Contra Costa County · Pacific time

ZIP code94509
CityAntioch
StateCalifornia
CountyContra Costa County
Population70,090
Time zonePacific · local time
ZIP typeStandard (has a Census ZCTA area)
Land area17.44 sq mi
Center (lat, long)37.9920, -121.8126

Area codes in this area

925

These are the area codes that most often serve ZIP 94509 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

94531 Antioch · 3.1 mi94565 Pittsburg · 6.4 mi94561 Oakley · 6.6 mi94517 Clayton · 8.2 mi94513 Brentwood · 8.3 mi94527 Concord · 8.3 mi94548 Knightsen · 8.8 mi94521 Concord · 9 mi

About ZIP 94509

ZIP code 94509 is assigned to Antioch, California. It lies in Contra Costa County. Its Census area covers about 17.44 square miles of land. The closest neighboring ZIP is 94531 (Antioch), about 3.1 miles away.

Every address in 94509 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources