The Maine coast line is the longest coast line in the USA if you were to straighten it out into a straight line. Therefore, the answer to your question is that all the states have a smaller coastline when Maine is stretched out.
Certainly it has a longer ocean coastline then Kansas, Colorado or Wyoming but it has less then:
The northernmost state along the Atlantic Ocean coastline is Maine. The northernmost state along the Pacific Ocean coastline is Washington.
Maine
Let's see. Maine, New York, New Hampshire, Connecticut, Rhode Island, Massachusetts, Delaware, Maryland, Virginia, North Caroline, South Carolina, Georgia, Florida. All of the eastern seaboard states from Maine to Florida are ON the Atlantic coast. No one can be any closer than the others.
Because Hawaii is an Island State it has no land boundaries and has 100% coastline. Alaska has much more coatline but is not an Island and therefore has a much smaller percentage of coastline.
Maine has a longer coastline with the Atlantic ocean.
Any landlocked state
Maine.
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The northernmost state along the Atlantic Ocean coastline is Maine. The northernmost state along the Pacific Ocean coastline is Washington.
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Augusta, Maine.