AA 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 Broad Run High School, Loudoun County High School, Loudoun Valley High School, Park View High School, Potomac Falls High School, and Stone Bridge High School.

The Dulles District's name is derived from the district's proximity to Washington Dulles International Airport, which is located in eastern Loudoun County.

Loudoun County's growth has been a factor in creating the Dulles District as more high schools in the county were being built during the 2000s, including four new members in the district since its founding in 2001. In 2002, Heritage High School opened; in 2003, Dominion High School opened; in 2005, Briar Woods High School and Freedom High School opened. In 2005, Loudoun Valley was moved to the AAA National District and Stone Bridge moved to the AAA Liberty District because their enrollments were considerably above the AA/AAA enrollment cutoffs. In 2007, George Mason High School in Falls Church, Virginia became the first non-Loudoun County school to enter the Dulles District, though only as a part-time member for lacrosse only, as their district, the A Bull Run District did not hold enough members to sponsor it. Mason's swim team will also be competing in the Dulles District in the 2009-2010 season. In 2009, Heritage was moved to the AAA Cedar Run District and the AAA Northwest Region due to their increasing enrollment.

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