Washington, DC’s area—72 square miles—is smaller than that of Bakersfield, Calif.
Expand DC to cover everything from the first national capital to New York in the north, take in large swaths of New Jersey (or the whole puissant state) on the way to the first colonial capital in Philadelphia in the center and run it south to include everything north of the C&D Canal to the remaining rump of central Maryland, DC and the northern Virginia counties which are part of the DC metro area.
Rename it Maryland or Maryjersey in honor of the erased states, or the State of Columbia or Capitol District #13.