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Union City is a city in the San Francisco Bay Area in Alameda County, California, United States located approximately 19 miles south of Oakland, 30 miles southeast of San Francisco, and 20 miles north of San Jose. Incorporated in 1959, combining the communities of Alvarado, New Haven, and Decoto, the city has 73,877 residents and a very diverse population. Alvarado is a California Historical Landmark (#503). The city celebrated its 50th Anniversary in 2009. The cities of Fremont and Newark,make up the Tri-City Area to the south. The city of Hayward surrounds the city to the north. In 2017, Union City started to rebrand and got a new city seal. Union City opened a new Teen Center in 2018.
The 2010 United States Census reported that Union City had a population of 69,516. The population density was 3,570.6 people per square mile (1,378.6/km²).
The population was spread out with 16,847 people (24.2%) under the age of 18, 6,453 people (9.3%) aged 18 to 24, 20,360 people (29.3%) aged 25 to 44, 18,146 people (26.1%) aged 45 to 64, and 7,710 people (11.1%) who were 65 years of age or older. The median age was 36.2 years. For every 100 females, there were 97.5 males. For every 100 females age 18 and over, there were 93.8 males.