Tecumseh is a city in Lenawee County in the U.S. state of Michigan, near the River Raisin. Tecumseh is about 60 miles (97 km) southwest of Detroit, 25 miles (40 km) south of Ann Arbor, and 40 miles (64 km) north of Toledo, Ohio. The main street of downtown is Chicago Boulevard, also designated as M-50. It crosses the River Raisin a few miles east of M-52.

Lenawee County is a county located in the U.S. state of Michigan. As of the 2020 United States Census, the population was 99,423. The county seat is Adrian. The county was created in 1822, from territory partitioned from Monroe County. Its governing structure was organized in 1826.