Union City, California

Union City, California
Union City Bay Area Rapid Transit (BART) station
Location in Alameda County and the state of California
Union City, California
Location in California
Union City, California
Union City, California (the United States)
Coordinates: 37°35′47″N 122°02′54″W / 37.59639°N 122.04833°W / 37.59639; -122.04833
Country United States
State California
CountyAlameda
IncorporatedJanuary 26, 1959
Government
 • MayorGary Singh
 • City Council
Jaime Patiño
Scott Sakakihara
Jeff Wang
Lance Nishihira
Area
 • Total
19.18 sq mi (49.68 km2)
 • Land19.18 sq mi (49.68 km2)
 • Water0 sq mi (0.00 km2)
Population
 (2020)
 • Total
70,143
 • Density3,657/sq mi (1,412/km2)
Time zoneUTC-8 (PST)
 • Summer (DST)UTC-7 (PDT)
ZIP code
94587
Area codes510, 341
FIPS code06-81204
Websitewww.unioncity.org

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.

It is located approximately 19 miles (31 km) south of Oakland, 30 miles (48 km) from San Francisco, and 20 miles (32 km) north of San Jose.

It was incorporated in 1959, combining the communities of Alvarado and Decoto. Alvarado is a California Historical Landmark (#503). The city celebrated its 50th anniversary in 2009.