Union is a city in and the county seat of Franklin County, Missouri, United States. It is located on the Bourbeuse River 50 miles (80 km) southwest of St. Louis. The population was 10,204 at the 2010 census, with the city showing the highest growth rate (32%) in Franklin County the last decade.
Union was founded in 1826 and designated as the county seat in 1827. The city is named for the ideal of political unity. A post office called Union has been in operation since 1827.
The city is located on the northwest side of the meandering Bourbeuse River. US Route 50 passes through the city and I-44 is about five miles to the east. Washington, on the Missouri River, is seven miles to the north on Missouri Route 47. According to the United States Census Bureau, the city has a total area of 9.16 square miles (23.72 km²), all of it land.
As of the census of 2010, there were 10,204 people, 3,902 households, and 2,612 families residing in the city. The population density was 1,114.0 inhabitants per square mile (430.1/km²). There were 4,226 housing units at an average density of 461.4 per square mile (178.1/km²). The racial makeup of the city was 95.7% White, 1.1% African American, 0.6% Native American, 0.4% Asian, 0.5% from other races, and 1.6% from two or more races. Hispanic or Latino of any race were 1.4% of the population.
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