ZIP Code 94528: Diablo, CA
County: Contra Costa County
Coordinates: 37.83870, -121.96670
ZIP Type: Standard
Time Zone: Pacific Time (PT)
Explore detailed information for ZIP code 94528 in Diablo, CA. We include verified county details for Contra Costa County plus key geographic references used for mapping and logistics.
| Primary City | Diablo |
|---|
| ZIP Code | 94528 |
|---|
| County | Contra Costa County |
|---|
| State | CA |
|---|
| Latitude / Longitude | 37.83870, -121.96670 |
|---|
| ZIP Type | Standard |
|---|
| Time Zone | Pacific Time (PT) |
|---|
| Data Updated | 2026-01-08 |
|---|
Advertisement
Maps & Useful Links
Open in Maps:
Google Maps ·
OpenStreetMap
These links show the approximate center point for ZIP 94528 (not an exact boundary).
Geographic & Administrative Context
Coordinates for 94528 are listed as 37.83870 / -121.96670, useful for GPS and service checks in and around Diablo, CA.
Local Coverage Notes
ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 94528 for mail delivery and general location reference in
Contra Costa County,
CA.
Some addresses near Diablo may share this ZIP due to delivery routing and local service areas.
Related ZIP Codes (Nearby)
Explore other postal codes near Diablo within CA.
Advertisement
Frequently Asked Questions
What is the primary city for ZIP code 94528?
The primary city for this ZIP code is Diablo, located in CA.
In which county is 94528 located?
ZIP code 94528 is situated within Contra Costa County, CA.
What are the coordinates for 94528?
The approximate center point is 37.83870 (Latitude) and -121.96670 (Longitude).
Is ZIP code 94528 active?
This page lists ZIP 94528 as Listed based on the latest refresh date shown above.
Does ZIP 94528 cover multiple areas?
Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.
Advertisement
Methodology & Data Notes
How we build this page: We generate this page from a structured ZIP dataset and refresh key fields (city, county, and coordinates) during scheduled updates. Coordinates represent an approximate center point, not an official boundary map.
Sources: Public ZIP reference datasets and geographic coordinate references. If you use specific sources (e.g., USPS, Census), list them on your About/Methodology page.
Page updated: 2026-01-08