Plymouth Township is a charter township in Wayne County in the U.S. state of Michigan. A western suburb of Detroit, Plymouth Township is located roughly 27 miles northwest of downtown Detroit, and 16 miles northeast of Ann Arbor. As of the 2020 census, the township had a population of 27,938. It surrounds, but is independent of, the city of P…Plymouth Township is a charter township in Wayne County in the U.S. state of Michigan. A western suburb of Detroit, Plymouth Township is located roughly 27 miles northwest of downtown Detroit, and 16 miles northeast of Ann Arbor. As of the 2020 census, the township had a population of 27,938. It surrounds, but is independent of, the city of Plymouth.