Bethel Island, California Zip Codes
📍 Bethel Island is in Contra Costa County, California with 1 zip code; the most populous is 94511.
Bethel Island is a USPS city name in Contra Costa County, California with a Census population of approximately 1,993 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 Bethel Island 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 Bethel Island Zip Codes
Bethel Island at a Glance
Bethel Island has 1 ZIP code in this directory: 1 standard delivery ZIP. The 1 ZIP with published Census housing data cover 1,993 residents, the largest being 94511 with 1,993 people.
The median ZIP in Bethel Island has a household income of $85,870 and a home value of $475,400, a price-to-income ratio of 5.5, below the 6.7 California ZIP median. Median rent across these ZIPs is $1,369 a month.
73% of households in the typical Bethel Island ZIP own their home (statewide ZIP median 64%). 25% of adults hold a bachelor's degree, below the 31% statewide median. The median poverty rate is 17.8%, far above the 10.8% statewide ZIP median. Overall density is about 376 residents per square mile across 5 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.
Bethel Island Zip Code Map
Interactive map of Bethel Island, California zip codes. Click any marker for details.