Home > CA > Contra Costa County > Antioch > Zip 94509

Zip Code 94509 — Antioch, CA

94509 is a ZIP Code associated with Antioch, CA, located within Contra Costa. The postal region supports an estimated population of 70,090 residents across Data Pending housing units, with a population density of 1,551.4 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (37.992140, -121.814200)

Data MetricLocal Statistic
Postal / Zip Code94509
Primary CityAntioch
State / ProvinceCA
CountyContra Costa
Total Population70,090
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density1,551.4 people/sq mi
TimezoneAmerica/Los_Angeles

How 94509 Compares

MetricZIP 94509Contra Costa CountyCA State Average
Population70,0901,171,36939,286,245
Median IncomeData PendingN/AN/A
Population Density1,551.4 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 94531Antioch3.2 mi46,387N/A
Zip 94565Pittsburg6.4 mi100,488N/A
Zip 94561Oakley6.7 mi46,368N/A
Zip 94517Clayton7.8 mi12,316N/A
Zip 94513Brentwood8.4 mi69,755N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →