ZIP Code 94509
Antioch · Contra Costa, California
94509 is the ZIP code of Antioch in Contra Costa, California, United States.
- ZIP Code
- 94509
- County
- Contra Costa
- State
- California
- Country
- United States
Place with ZIP code 94509
| Place | County | Location |
|---|---|---|
| Antioch | Contra Costa | 37.994, -121.809 |
Near San Francisco
The nearest major city is San Francisco, about 59 km away.
Nearby ZIP codes
Frequently asked questions
Which places use ZIP code 94509?
Antioch.
Which county and state is 94509 in?
Contra Costa, California, United States.
What is the nearest major city to 94509?
San Francisco, about 59 km away.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.