Diablo, California Zip Codes
📍 Diablo is in Contra Costa County, California with 1 zip code; the most populous is 94528.
Diablo is a USPS city name in Contra Costa County, California with a Census population of approximately 726 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 Diablo 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 Diablo Zip Codes
Diablo at a Glance
Diablo has 1 ZIP code in this directory: 1 standard delivery ZIP. The 1 ZIP with published Census housing data cover 726 residents, the largest being 94528 with 726 people.
The median ZIP in Diablo has a household income of $250,001 and a home value of more than $2,000,000, a price-to-income ratio of at least 8.0, above the 6.7 California ZIP median.
100% of households in the typical Diablo ZIP own their home (statewide ZIP median 64%). 73% of adults hold a bachelor's degree, far above the 31% statewide median. The median poverty rate is 17.1%, far above the 10.8% statewide ZIP median. Overall density is about 605 residents per square mile across 1 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.
Diablo Zip Code Map
Interactive map of Diablo, California zip codes. Click any marker for details.