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" because of its location between Milwaukee, Sheboygan, Fond du Lac, and Green Bay. The population was 8,445 at the 2010 census. Mayor Don Pohlman was last reelected in April 2014.