Plymouth is a city in Sheboygan County, Wisconsin, United States. The population was 8,932 at the 2020 census. It is part of the Sheboygan, Wisconsin, metropolitan area. Located along the Mullet River, it is surrounded by the Town of Plymouth. It is known as "Hub City" for its former role as a center of wooden wheelwrighting. Advertising itself as "The Cheese Capital of the World," it produces 14% of the cheese consumed in the United States. The mayor is Don Pohlman.