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.

St. Joseph County is a county located in the U.S. state of Michigan, on the central southern border with Indiana. As of the 2020 United States Census, the population was 60,939. The county seat is Centreville.