The 87th House of Delegates District stretches from just north of Rt. 7 all the way to Interstate 66 and includes both the Dulles Airport and Bull Run Mountain. It includes most of Sterling, South Riding, and Stone Ridge, as well as large portions of Cascades, Brambleton, Loudoun Valley Estates, and Dominion Valley.
If you are not sure if you live in the 87th District, please use this link: http://whosmy.virginiageneralassembly.gov/
Loudoun County
Loudoun County Registrar's Office
Prince William County
Prince William County Registrar's Office
Virginia State Board of Elections