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Union City, CA Area Codes

Union City, California (population 65,282) uses area codes 510 and 341.

Area code510
Area code341
Time zonePacific
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Union City has no telephone exchange of its own in NANPA records; it is served by the Hayward exchange about 8 km away.

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Union City and nearby cities in area code 510

Carriers with Union City numbers

130 prefixes are assigned to the Hayward exchange: 33% mobile, 25% VoIP and cable, 42% landline.

CarrierPrefixes
AT&T (Pacific Bell)36
Verizon Wireless16
AT&T Mobility16
Onvoy (Sinch)14
Metropcs10
T-Mobile9
Bandwidth5
Lumen (Level 3)4

Area codes used in Union City

Area codePrefixes serving Union CityMain carriers in this code
510117AT&T (Pacific Bell), AT&T Mobility, T-Mobile
34113Fractel, Onvoy (Sinch), AT&T Mobility

Union City phone number prefixes

Numbers starting with these first six digits were originally assigned to the Hayward exchange.

Nearby cities in area code 510

Questions

What is the area code for Union City, CA?
Union City uses 2 area codes: 510 and 341. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.
What time zone is Union City in?
Union City is in the Pacific time zone.