Union City is a city located in the state of Tennessee in the United States. It serves as the county seat for Obion County. As of the 2020 census, the city had a population of 11,170 residents.
The city functions as the principal urban settlement of its surrounding micropolitan area, which encompasses both Obion County in Tennessee and Fulton County in Kentucky. A notable local landmark is Discovery Park of America, a museum featuring exhibits on local history, state, national, and world history, as well as science, technology, and art.