Sterling borders the Potomac River. Communities Broad Run Farms is a residential area north of Virginia State Route 7 and28 that was founded in 1952. It shares the ZIP code of 20165 which uses "Sterling" or "Potomac Falls" as recommended addresses. As an area much older than the surrounding recent growth, it has features unique to the region, including large lots, highly wooded old-growth trees, a wide variety of housing and a voluntary civic association. The Potomac River forms its northern border, and Broad Run its western. A U.S. Senate lawyer bought the Miskel farm in 1950 and later subdivided it, founding Broad Run Farms. The Civil War Skirmish at Miskel Farm propelled Confederate Captain John S. Mosby to fame. The community banded together in 1995, with state and county help, to finance and install its own sewer service, in part through an added property tax. The lien was paid off several years early and the tax has now been retired. Cascades is a planned community within the 20165 ZIP code. The area is located in the northeasternmost part of Loudoun County, between the Fairfax County line to the east, the Potomac River to the north, and Algonkian Parkway to the south. Located just north of Route7, along the Algonkian Parkway, approximately 6500 homes comprise the community. Countryside is a housing development in Sterling (20165 ZIP code), bounded by the Potomac River to the north and by Route7 (Leesburg Pike) to the south. This subdivision was conceived in the middle 1970s when of farmland was divided in preparation for a planned housing development. Homes construction began in 1983 and continued through 1991. Today, Countryside covers about and consists of 2,539homes, which includes 1,269single-family homes, 1,168town homes, and 102condominium units. Countryside contains a shopping center anchored by Safeway and CVS. The shopping center is within the mixed-use Countryside Commercial and Professional Center, which contains various office buildings. Countryside is governed by the CountrySide Proprietary, the community's homeowners association. Dulles is an unincorporated area in Loudoun County, with ZIP code 20166. The headquarters of Orbital ATK (on Warp Drive), ODIN Technologies, the former headquarters of MCI Inc., and AOL are located in Dulles. The usage of Dulles as a community name began in the mid-1980s when Loudoun County economic development officer Pam Treadwell successfully lobbied the United States Postal Service to allow Sterling businesses and residents to use Dulles as an alternate