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Union is a city in and the county seat of Franklin County, Missouri, United States. It is located on the Bourbeuse River 50mi 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.HistoryUnion 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.GeographyUnion is located at . According to the United States Census Bureau, the city has a total area of 9.16sqmi, all of it land.Demographics2010 censusAs 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 1114.0PD/sqmi. There were 4,226 housing units at an average density of 461.4/sqmi. 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.Union is in Missouri (MO). Plan your visit to Union and other destinations in United States using our United States day trip planning tool .
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