Union City is a city located in California. With a 2020 population of 73,201, it is the 120th largest city in California and the 500th largest city in the United States. Union City is currently declining at a rate of -0.62% annually but its population has increased by 5.30% since the most recent census, which recorded a population of 69,516 in 2010. Union City reached it's highest population of 75,465 in 2016. Spanning over 19 miles, Union City has a population density of 3,773 people per square mile.
The average household income in Union City is $133,752 with a poverty rate of 4.97%. The median rental costs in recent years comes to $2,202 per month, and the median house value is $765,500. The median age in Union City is 38.4 years, 36.4 years for males, and 40.9 years for females. For every 100 females there are 107.3 males.