Union City is a city located in California. With a 2020 population of 73,949, it is the 121st largest city in California and the 492nd largest city in the United States. Union City is currently declining at a rate of -0.41% annually but its population has increased by 6.38% since the most recent census, which recorded a population of 69,516 in 2010. Union City reached it's highest population of 75,438 in 2016. Spanning over 19 miles, Union City has a population density of 3,812 people per square mile.
The average household income in Union City is $126,295 with a poverty rate of 6.39%. The median rental costs in recent years comes to $2,063 per month, and the median house value is $688,800. The median age in Union City is 38.4 years, 36.5 years for males, and 40.7 years for females. For every 100 females there are 104.5 males.