Port Costa, California Zip Codes
📍 Port Costa is in Contra Costa County, California with 1 zip code; the most populous is 94569.
Port Costa is a USPS city name in Contra Costa County, California with a Census population of approximately 251 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 Port Costa 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 Port Costa Zip Codes
Port Costa at a Glance
Port Costa has 1 ZIP code in this directory: 1 standard delivery ZIP.
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.
Port Costa Zip Code Map
Interactive map of Port Costa, California zip codes. Click any marker for details.