Plymouth is a city in Sheboygan County, Wisconsin, along the Mullet River. The population was 7,781 at the 2000 census. It is included in the Sheboygan, Wisconsin Metropolitan Statistical Area. The city is located within 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.
Plymouth is located at 43°44′57″N 87°58′36″W / 43.74917°N 87.97667°W / 43.74917; -87.97667 (43.749277, -87.976799).
According to the United States Census Bureau, the city has a total area of 4.2 square miles (10.8 km²), of which, 4.1 square miles (10.6 km²) of it is land and 0.1 square miles (0.2 km²) of it (1.44%) is water.
As of the census of 2000, there were 7,781 people, 3,262 households, and 2,071 families residing in the city. The population density was 1,895.5 people per square mile (732.7/km²). There were 3,395 housing units at an average density of 827.0 per square mile (319.7/km²). The racial makeup of the city was 98.44% White, 0.23% Black or African American, 0.22% Native American, 0.44% Asian, 0.19% from other races, and 0.48% from two or more races. 1.11% of the population were Hispanic or Latino of any race.