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is a city in and the county seat of Franklin County, Missouri, United States. The population was 7,757 at the 2000 census. It is located on the Bourbeuse River. The city was founded in 1827 and is named after the ideal of political unity.
Union is located at (38.446684, -91.006070). According to the United States Census Bureau, the city has a total area of .81 square miles (20.9 km²), all of it land.