Michigan's 7th congressional district is a United States congressional district in Southern Michigan and portions of Central Michigan. From 2004 to 2013 it consisted of all of Branch, Eaton, Hillsdale, Jackson, and Lenawee counties, and included most of Calhoun and a large portion of western and northern Washtenaw counties. The current district, which was created in 2022, is centered around Lansing, Michigan's state capital, and includes all of Clinton, Shiawassee, Ingham, and Livingston counties, as well as portions of Eaton and Oakland counties.

Eaton County is a county in the U.S. state of Michigan. As of the 2020 United States Census, the population was 109,175. The county seat is Charlotte. The county was organized in 1837 and was named for John Eaton, who was Secretary of War under U.S. President Andrew Jackson, making it one of Michigan's Cabinet counties. Eaton County is included in the Lansing-East Lansing, Metropolitan Statistical area in Central Michigan.