 CountrySide is located about northwest of Washington and is bounded by the Potomac River to the north, and by Route 7 (Leesburg Pike) to the south.Located in eastern Loudoun County, it is about from Washington Dulles International Airport.The CountrySide subdivision was conceived in the middle 1970s when a tract of 1,000 acres (4 km²) of open farmland was subdivided in preparation for a planned housing development.