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.

Sheboygan County is a county in the U.S. state of Wisconsin. It is named after the Sheboygan River. As of the 2020 census, the population was 118,034. Its county seat is Sheboygan. The county was created in 1836 and organized in 1846. At the time, it was located in the Wisconsin Territory. Sheboygan County comprises the Sheboygan, WI Metropolitan Statistical Area. Part of the Holyland region is located in northwestern Sheboygan County.