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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.