FMSCA Regulation 372.219
372.219 Washington, D.C.
The zone adjacent to, and commercially a part of Washington, D.C., within which transportation by motor vehicle in interstate or foreign commerce, not under common control, management, or arrangement for a continuous carriage or shipment to or from a point beyond such zone, is partially exempt from regulation under 49 U.S.C. 13506(b)(1) includes and is comprised of all points as follows:
(a) The municipality of Washington, D.C., itself;
(b) All points within a line drawn 15 miles beyond the municipal limits of Washington, D.C.
(c) All points in Fairfax and Loudoun Counties, VA, and all points in Prince William County, VA, including the City of Manassas, VA, and the City of Manassas Park, VA.;
(d) All of any municipality any part of which is within the limits of the combined areas defined in paragraphs(b) and (c)of this section, and
(e) All of any municipality wholly surrounded, or so surrounded except for a water boundary, by the municipality of Washington, D.C., or by any other municipality included under the terms of paragraph (d) of this section.
