Purcellville is a town in Loudoun County, Virginia, United States. The population was 7,727 as of the 2010 census. Purcellville is the major population center for western Loudoun and the Loudoun Valley. According to the United States Census Bureau, the town has a total area of 3.1 square miles, all of it land. Purcellville lies in western Loudoun County, Virginia, in the heart of the Loudoun Valley, approximately 9 miles west of the County Seat of Leesburg, Virginia. Just to the west are the Blue Ridge Mountains (visible from many areas of town) and the town Round Hill, 4 miles (6.4 km) away. Philomont is 5 miles (8.0 km) miles south, and Middleburg, Virginia is approximately 12 miles (19 km) to the southeast. Lovettsville is approximately 11 miles (18 km) to the north.
Loudoun County is a county located in the Commonwealth of Virginia. In 2014, the population was estimated to be 361,708, making it the third-most populous county in Virginia. Loudoun County is included in the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area. Loudoun County was established in 1757 from Fairfax County. The county is named for John Campbell, Fourth Earl of Loudoun and Governor General of Virginia from 1756–59. According to the U.S. Census Bureau, Loudoun County has a total area of 521 square miles, of which 516 square miles is land and 6 square miles is water. It is bounded on the north by the Potomac River; across the river are Frederick, Washington and Montgomery counties in Maryland; it is bounded on the south by Prince William and Fauquier counties, on the west by watershed of the Blue Ridge Mountain across which are Jefferson County, West Virginia and Clarke County, and on the east by Fairfax County. The Bull Run Mountains and Catoctin Mountain bisect the county. To the west of the range is the Loudoun Valley. Bisecting the Loudoun Valley from Hillsboro to the Potomac River is Short Hill Mountain.