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Countryside is a census-designated place in Loudoun County, Virginia, United States. As of the 2020 census, Countryside had a population of 10,418. It is located approximately 27 miles (43 km) northwest of Washington and is bounded by the Potomac River to the north, and by Route 7 to the south. Located in eastern Loudoun County, it is about 9 miles (14 km) north of Washington Dulles International Airport. It is bordered by the community of Cascades to the east and by Dulles Town Center to the south, across Route 7.