Antioch, California Zip Codes
📍 Antioch is in Contra Costa County, California with 2 zip codes; the most populous is 94509.
Antioch is a USPS city name in Contra Costa County, California with a Census population of approximately 115,004 across its ZIP codes. Contra Costa County as a whole has 53 ZIP codes in this directory. Below you'll find every zip code serving Antioch with population, income and home value, a map, and the city's affordability profile.
Population and demographic data sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code routing data sourced from the United States Postal Service (USPS).
All Antioch Zip Codes
Antioch at a Glance
Antioch has 2 ZIP codes in this directory: 2 standard delivery ZIPs. The 2 ZIPs with published Census housing data cover 115,004 residents, the largest being 94509 with 70,889 people.
The median ZIP in Antioch has a household income of $96,969 and a home value of $570,550, a price-to-income ratio of 6.0, below the 6.7 California ZIP median. The highest median income is in 94531 at $115,300. Median rent across these ZIPs is $2,406 a month.
64% of households in the typical Antioch ZIP own their home (statewide ZIP median 64%). 24% of adults hold a bachelor's degree, below the 31% statewide median. The median poverty rate is 11.3%, above the 10.8% statewide ZIP median. Overall density is about 3,663 residents per square mile across 31 square miles of ZIP land area.
Medians are taken across the ZIP codes listed below (each ZIP weighted equally); PO Box and no-data ZIPs are excluded. Definitions on the methodology page; statewide comparisons in the 2026 California ZIP Code Affordability Report.
Antioch Zip Code Map
Interactive map of Antioch, California zip codes. Click any marker for details.