Dulles, Virginia Postal Service to allow Sterling businesses and residents to use Dulles as an alternative address. The USPS defines Dulles as an "acceptable" city name for the 20166 zip code, whose "actual" city name is Sterling. The addresses for shipping parcels to United States embassies and consulates, as well as their employees worldwide, are located in Dulles. The USPS city name for zipcode 20189 is Dulles. Washington Dulles International Airport is located partially in Dulles (although its postal address uses the Sterling name instead) and partially in Fairfax County. The community derives its name from the airport; the airport in turn
Dulles District Dulles District The 4A Dulles District is a high school conference in the state of Virginia that includes schools from Northern Virginia, with all of its full-time members from Loudoun County. 4A is the third largest enrollment class of the Virginia High School League and is typically very competitive in Virginia high school sports. The Dulles District schools compete in the 4A West Region with the schools from Conference 21A, Conference 22, Conference 23, and Conference 24. The Dulles District was created in 2001 from all six Loudoun County high schools that were in the AA Northwestern District, which were