Masontown is a town in Preston County, West Virginia, United States. The population was 546 at the 2010 census.
Masontown was laid out and platted in 1856. The town was named after William Mason, a pioneer merchant.
Located near Masontown is the Ralphsynder Decagonal Barn, listed on the National Register of Historic Places in 1985.
Masontown is located at 39°33′7″N 79°48′1″W (39.551821, -79.800156). It has also been host to the All Good Music Festival for the past few years.
According to the United States Census Bureau, the town has a total area of 0.28 square miles (0.73 km2), all of it land.
At the 2010 census there were 546 people, 255 households, and 149 families living in the town. The population density was 1,950.0 inhabitants per square mile (752.9/km2). There were 311 housing units at an average density of 1,110.7 per square mile (428.8/km2). The racial makeup of the town was 98.5% White, 0.5% Pacific Islander, and 0.9% from two or more races. Hispanic or Latino of any race were 0.4%.
Of the 255 households 21.6% had children under the age of 18 living with them, 43.1% were married couples living together, 9.4% had a female householder with no husband present, 5.9% had a male householder with no wife present, and 41.6% were non-families.