Maine
The only state in the United States that is bordered by two oceans is Alaska. The two oceans are the Artic and the Pacific ocean.
Pennsylvania
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Only one other state? Maine. No other states? Alaska and Hawaii.
Washington borders only 2 other states
It is the only state in the US to border on only one other state. All other states border on no others (Alaska and Hawaii) or on at least two other states.
Illinois.
48 states touch at least one other state. Some states of the 48 touch at least 3 other states. Only Alaska and Hawaii don't touch another state.
Alaska and Hawaii border no other states. If you're wondering about the contiguous United States, Maine is the only state that borders just one other state; New Hampshire.
West Virginia is the mountain state that borders only other mountain states. The capital of West Virginia is Charleston.
Maine is the only U.S. state that is bordered by only one state. Maine is bordered by New Hampshire to the west, the Atlantic Ocean to the southeast, and the Canadian provinces of New Brunswick and Quebec to the northeast and northwest respectively.