ZIP Code 94528

ZIP code 94528 is classified by USPS as a standard delivery area and covers roughly 6.1 square miles in Diablo, Contra Costa County, California. The area is home to 964 residents, producing a population density of 159 people per square mile, and falls within the Los Angeles time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 94528 against California and the nation.

On the economic side, the median household income for ZIP 94528 sits at $207,500 (104% above the California average), while per-capita income is $127,901. The poverty rate stands at 8.1% and the unemployment rate at 7.1%. On housing, the median home value is $2,000,001 (159% above the state average) with median rent at — per month, and 100.0% of occupied units are owner-occupied, a direct signal of whether 94528 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 79.8% of adults hold a bachelor's degree or higher, the median age is 43, and the average commute is —. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Contra Costa County, so you can benchmark 94528 against its immediate geography rather than a national average alone. Every figure is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates, HUD Fair Market Rents, and FHFA Home Price Index data, no estimates, no proprietary scoring. Verify with HUD →