Dumfries, officially the Town of Dumfries, is a town in Prince William County, Virginia. According to the United States Census Bureau, the town has a total area of 1.6 square miles, all of it land. The town is situated 70 miles north of the state capital, Richmond. It is 30 miles south of central Washington, D.C. The history of Dumfries began as early as 1690 when Richard Gibson erected a gristmill on Quantico Creek. Alexander Henderson built a house known as the Henderson House which still stands on a hill in Dumfries, as well as owning various land in Prince William Forest Park. Alexander was a merchant when the ports were booming in Dumfries. Alexander is famous for his son, United States Marine Corps commandant Archibald Henderson.
Dumfries was combined with the community of Triangle, Virginia to form Dumfries-Triangle in the 1950 United States Census. However, the two communities were separated again by the time of the 1960 census. The median income for a household in the town was $43,672, and the median income for a family was $46,927. Males had a median income of $35,247 versus $24,451 for females. The per capita income for the town was $17,652.