Union City is a village in the U.S. state of Michigan. Most of the village is within Union Township in Branch County with only a very small portion extending north into Burlington Township in Calhoun County. The population was 1,714 at the 2020 census.

Branch County is a county in the U.S. state of Michigan. As of the 2020 Census, the population was 44,862. The county seat is Coldwater. As one of the "cabinet counties" it was named for the U.S. Secretary of the Navy John Branch under President Andrew Jackson. The county was founded in 1829, and was organized in 1833.