Chapmanville is a town in Logan County, West Virginia, in the United States. The population was 1,256 at the 2010 census. Chapmanville, originally called Chapmansville, is named for Ned Chapman, an early settler who operated a store and post office. It was incorporated in 1947.
Chapmanville is located in northern Logan County at 37°58′18″N 82°1′12″W (37.971615, -82.020017). It is situated between the mouth of Crawley Creek and Godby Branch along the Guyandotte River at a point where the northward-flowing river briefly bends sharply southwestwardly before turning north again.
U.S. Route 119 and West Virginia Route 10, both of which approach from Logan to the south, intersect in Chapmanville. From this intersection, WV 10 continues northward in the direction of Huntington, while US 119 veers northeastward toward Charleston.
According to the United States Census Bureau, the town has a total area of 0.67 square miles (1.74 km2), of which, 0.65 square miles (1.68 km2) is land and 0.02 square miles (0.05 km2) is water.
As of the census of 2010, there were 1,256 people, 604 households, and 338 families living in the town. The population density was 1,932.3 inhabitants per square mile (746.1/km2). There were 667 housing units at an average density of 1,026.2 per square mile (396.2/km2). The racial makeup of the town was 98.2% White, 0.2% African American, 0.6% Asian, 0.4% from other races, and 0.6% from two or more races.