21 U.S. States with No Ocean Coastline (Atlantic, Pacific, or Gulf)

These 21 states are entirely landlocked—no tidal shoreline on the Atlantic, Pacific, or Gulf of Mexico. (Great Lakes shoreline ≠ ocean coast.)

The List

State	Region	Nearest Ocean Access
Arizona	Southwest	Gulf of California (Mexico) / Pacific (CA)
Arkansas	South Central	Gulf of Mexico (via Mississippi)
Colorado	Mountain West	Pacific (CA) / Gulf (TX)
Idaho	Pacific Northwest	Pacific (WA/OR)
Iowa	Midwest	Gulf (via Mississippi)
Kansas	Midwest	Gulf (via Arkansas/Mississippi)
Kentucky	South	Gulf (via Ohio/Mississippi)
Michigan	Great Lakes	Atlantic (via St. Lawrence)
Minnesota	Upper Midwest	Atlantic (via Great Lakes/St. Lawrence)
Missouri	Midwest	Gulf (via Mississippi)
Montana	Mountain West	Pacific (WA/OR)
Nebraska	Great Plains	Gulf (via Missouri/Mississippi)
New Mexico	Southwest	Gulf of California / Pacific
North Dakota	Northern Plains	Atlantic (via Hudson Bay/St. Lawrence*)
Ohio	Midwest	Atlantic (via Lake Erie/St. Lawrence)
Oklahoma	South Central	Gulf (via Arkansas/Red River)
South Dakota	Northern Plains	Gulf (via Missouri/Mississippi)
Tennessee	South	Gulf (via Tennessee/Ohio/Mississippi)
Utah	Mountain West	Pacific (CA/NV)
Vermont	New England	Atlantic (via Lake Champlain/Richelieu/St. Lawrence)
West Virginia	Appalachia	Atlantic (via Potomac/Ohio)
Wisconsin	Great Lakes	Atlantic (via Lake Michigan/St. Lawrence)
Wyoming	Mountain West	Pacific (via Columbia/Snake)

Michigan, Wisconsin, Minnesota, Ohio, Vermont have Great Lakes coastlines—freshwater, not ocean.
North Dakota drains *north* to Hudson Bay (Arctic Ocean) via Red River → Nelson River; Atlantic access is theoretical.
Total landlocked states: 27 if you count Great Lakes as non-ocean. The 6 Great Lakes states above are the only ones with *any* maritime coastline.