Mannington is a city in Marion County, West Virginia, United States located in the hills of North-Central West Virginia. Known as Mannington since 1856, the town is rich with history and heritage – from Native American relics to frontiersmen and their settlements to Civil War legends. Perhaps what makes Mannington most unusual is the impact of the oil and gas boom in 1890 that literally changed the shape of the town. The population was 2,063 at the 2010 census.