There are no states that aren't states, although some are legally called "commonwealths." However the District of Columbia (which is coterminous with the city of Washington, DC) is not a state although it shares several attributes.
*That is the likely source of this question, as a miscopied variant of the related question below.
Maine borders only one state.
No state in the US is sovereign.
Maine is the only state that only borders one other state (New Hampshire).
The only US state that begins with the letter "P" is Pennsylvania.
Maine.
The only city in the US that is not in a state is Washington, D.C.
AnswerOhio.Ohio.IT IS THE ONLY STATE
Maine.
Maine
Maine.
Washington D.C. is not in a state.
Maine