Round Hill is a town in Loudoun County, Virginia, United States. Its population was 539 at the 2010 census and an estimated 656 in 2019. The town is located at the crossroads of Virginia Routes 7 a…Round Hill is a town in Loudoun County, Virginia, United States. Its population was 539 at the 2010 census and an estimated 656 in 2019. The town is located at the crossroads of Virginia Routes 7 and 719, approximately 50 miles northwest of Washington, D.C. The town's name refers a hill two miles northeast of a 910-foot hill used during the American Civil War as a signal post by both Confederate and Union troops.
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