City · California · United States
Union City, CA — ZIP codes
1 ZIP code · Alameda County
- City
- Union City
- County
- Alameda
- State
- California
- Country
- United States
- Postal code
- 94587Single source
- Coordinates
- 37.5895, -122.0497 View on OpenStreetMap
- Area code
- 831 (from the nearest rate centre)
ZIP codes (1)
| Postal code | Place name | Verification |
|---|---|---|
| 94587 | Union City | Single source |
Sources and verification
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 · U.S. Census Bureau (ACS). Last generated : 2026-08-21. Report an error.