Round Hill is a town in Loudoun County, Virginia, United States. Its population was estimated at 539 in 2010 by the U.S. Census Bureau. The town is located at the crossroads of Virginia routes 7 and 719 (Woodgrove Road), approximately 50 miles northwest of Washington, D.C. It was named "Round Hill" for being located two miles northeast of a 910-foot hill used during the American Civil War as a signal post by both Confederate and Union troops.
Round Hill is located at 39°8′1″N 77°46′13″W (39.133625, −77.770217). According to the United States Census Bureau, the town has a total area of 0.2 square miles (0.52 km²), all of it land.
As of the census of 2010, 539 people in 202 households and 155 families resided in the town. The population density was 2,695 people per square mile (1040.5/km²). There were 218 housing units at an average density of 1090 per square mile (420.9/km²). Of that population, 93.32% was White; 2.78%, African American; 1.11%, Asian; and 0.93% of the population was mixed-race. Hispanics or Latinos of any race constituted 3.53% of the population.
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