Union is a city located in Franklin County Missouri. It is also the county seat of Franklin County. With a 2020 population of 12,554, it is the 60th largest city in Missouri and the 2624th largest city in the United States . Union is currently growing at a rate of 2.30% annually and its population has increased by 23.03% since the most recent census, which recorded a population of 10,204 in 2010. Union reached it's highest population of 12,554 in 2021. Spanning over 9 miles, Union has a population density of 1,381 people per square mile.
The average household income in Union is $66,248 with a poverty rate of 11.27%. The median rental costs in recent years comes to $726 per month, and the median house value is $148,800. The median age in Union is 33.9 years, 31.8 years for males, and 36 years for females.