ZIP code · Diablo · California · United States
ZIP code 94528 — Diablo
ZIP code 94528 serves Diablo, California.
- Postal code
- 94528Single source Value from one source, not cross-checked.
- City
- Diablo
- County
- Contra Costa
- State
- California
- Country
- United States
- Coordinates
- 37.8387, -121.9667 — precision precise (locality)
View on OpenStreetMap
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames. Data generated on 2026-08-21. Methodology · Report an error on this page