ZIP Code 94509: Antioch, CA
County: Contra Costa County
Coordinates: 37.99390, -121.80890
ZIP Type: Standard
Time Zone: Pacific Time (PT)
This profile provides an in-depth look at ZIP code 94509, serving Antioch in CA. It lies in Contra Costa County and supports delivery, planning, and address verification.
| Primary City | Antioch |
|---|
| ZIP Code | 94509 |
|---|
| County | Contra Costa County |
|---|
| State | CA |
|---|
| Latitude / Longitude | 37.99390, -121.80890 |
|---|
| 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 94509 (not an exact boundary).
Geographic & Administrative Context
Coordinates for 94509 are listed as 37.99390 / -121.80890, useful for GPS and service checks in and around Antioch, CA.
Local Coverage Notes
ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 94509 for mail delivery and general location reference in
Contra Costa County,
CA.
This ZIP may extend beyond the city core into nearby communities within Contra Costa County.
Related ZIP Codes (Nearby)
Explore other postal codes near Antioch within CA.
Advertisement
Frequently Asked Questions
What is the primary city for ZIP code 94509?
The primary city for this ZIP code is Antioch, located in CA.
In which county is 94509 located?
ZIP code 94509 is situated within Contra Costa County, CA.
What are the coordinates for 94509?
The approximate center point is 37.99390 (Latitude) and -121.80890 (Longitude).
Is ZIP code 94509 active?
This page lists ZIP 94509 as Listed based on the latest refresh date shown above.
Does ZIP 94509 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