Plymouth is a city in Sheboygan County, Wisconsin, along the Mullet River. It is included in the Sheboygan, Wisconsin Metropolitan Statistical Area. The city is located in the Town of Plymouth, but is politically independent. Plymouth is known as "Hub City" for its former role as a center of wooden wheelwrighting. The population was 8,932 at the 2020 census. Mayor Don Pohlman was last re-elected in April 2018.