Union, California
No ZIP code carries the name of Union, California, in Alameda County; the nearest ZIP codes are 94536, 94544 and 94587, in area code 510, with 341 as an overlay.
- Nearest ZIP
- 94536, 94544, 94587
- Area codes
- 510, 341
- County
- Alameda County
- State
- California
- Time zone
- Pacific Time
- Coordinates
- 37.6028, -122.0188
Nearest ZIP codes to Union
These are the ZIP codes nearest to Union, each listed with the post office it is named after.
Area codes for Union
- Area code 510
In service since September 2, 1991. Shares its area with 341. Local calls are dialed with 1 plus ten digits.
- Area code 341
In service since July 22, 2019. Shares its area with 510. Local calls are dialed with 1 plus ten digits.
Area codes here are matched from telephone rate centers, so a place near a boundary can have local numbers from either side of it.
Time zone
Union is in the Pacific Time zone.
Towns near Union
- Union City3.1 km (1.9 mi)
- Fremont5.2 km (3.2 mi)
- Hayward6.7 km (4.2 mi)
- Newark7.4 km (4.6 mi)
- Fairview8.6 km (5.3 mi)
- Sunol10.6 km (6.6 mi)
- Cherryland11.3 km (7.0 mi)
- Castro Valley12.1 km (7.5 mi)
Local numbers in area code 510
Looking for a phone number with a Union area code? These 510 numbers are for sale through Exclusive Digits. Portable to Verizon, AT&T, T-Mobile and all major US carriers.
- (510) 810-7707Alameda, CA$59View & buy
- (510) 810-7717Alameda, CA$59View & buy
- (510) 810-7727Alameda, CAAlso spells SPAS$59View & buy
- (510) 810-7767Alameda, CAAlso spells PROP, PROS$59View & buy
- (510) 810-7787Alameda, CAAlso spells SPUR$59View & buy
- (510) 810-7797Alameda, CA$59View & buy
- (510) 838-2008Oakland, CA$59View & buy
- (510) 838-2789Oakland, CAAlso spells TASTY$59View & buy
- (510) 838-2987Oakland, CA$59View & buy
- (510) 838-4568Oakland, CA$59View & buy
- (510) 838-4678Oakland, CAAlso spells HOST$59View & buy
- (510) 838-4789Oakland, CA$59View & buy
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