Chapmanville is a town in Logan County, West Virginia, in the United States. The population was 1,256 at the 2010 census. Chapmanville was founded in 1800 and 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 along the Guyandotte River at a point where the northward-flowing river briefly bends sharply southwestwardly before turning north again. The community of Phico lies just south of Chapmanville.
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 residing in the town. The population density was 1,932.3 inhabitants per square mile (746.1/km2).