The Public Information Center for D.C. Traffic Law serves the cities of Washington, D.C., Rockville, Upper Marlboro, Prince Frederick, Towson, Frederick, Gaithersburg, Bethesda, Silver Spring, Arlington, Fairfax, Leesburg, Warrenton, Manassas, McLean, Reston, Falls Church and Annandale, and the counties of Arlington, Fairfax, Loudoun, Fauquier, Prince William, Montgomery, Prince George, Calvert, Baltimore and Frederick; District of Columbia, Virginia, Maryland Virginia: Bolling AFB, Fort McNair.