City · United States

Union City

Union City is a city in Alameda County, California, United States in the San Francisco Bay Area. The population in the 2020 census was 70,143, up from 69,628 in the 2010 census.

Good to know

• Population: 74,494.
• Area: 50.2 sq km.
• Elevation: 21 m.
• Timezone: America/Los_Angeles.

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