The longest north-south distance in the contiguous United States is from Key West, Florida to Point Arena, California. The distance is 2,700 miles (4,345 kilometers). The route would generally follow Interstate 95 and US 1.
There are a few other contenders for the title of longest north-south state. Alaska has a longer north-south distance if you include its Aleutian Islands, which extend westward nearly 2,000 miles (3,219 kilometers) from the mainland. However, if you consider only the contiguous part of Alaskaâ€”the part that shares a land border with Canadaâ€”then its north-south distance is only about 1,400 miles (2,253 kilometers).
Hawaii also has a longer north-south distance if you include its offshore islands. From Niihau in the northwest to the Big Island in the southeast, Hawaii extends about 1,500 miles (2,414 kilometers). But again, if you consider only the main islands that make up Hawaiiâ€”from Kauai in the northwest to Maui in the southeastâ€”then its north-south distance shrinks to just under 400 miles (644 kilometers).
So by those standards,â€”Key West to Point Arena on mainland US soil,â€”the longestnorth- south state route is approximately 2 700 miles .