Mannington is a city in Marion County, West Virginia, United States, located in the hills of North Central West Virginia. The population was 1,961 at the 2020 census. In its earliest years it was called Forks of Buffalo or Koon Town, but has been called Mannington since 1856.

Marion County is a county in the U.S. state of West Virginia. As of the 2020 census, the population was 56,205. Its county seat is Fairmont. The county was named in honor of General Francis Marion, known to history as "The Swamp Fox".