Since the United States Constitution only provides for States to have Representatives to the House of Representatives and Senate, the District of Columbia has no such representation, but is under the direct governance of the Congress.
Until ratification of the 23rd Amendment in 1961, residents of the District could not vote for President and Vice President either, but that amendment allowed them to do so, and they now control three electoral college votes, putting them on a par with the smaller states in Presidential elections.
The Delegates mentioned here serve as Shadow Representatives who lobby Congress in the interests of the District. They are also allowed to vote in committee, but not on the floor of the House.
In the House, each state is represented on the basis of population, but each state is entitled to at least one member; the total membership of the body is fixed by law at 435.
Delegates to the UnitedStatesHouse of Representatives from Dakota Territory
Historian of the UnitedStatesHouse of Representatives