U.S. Route 1 (US 1) runs from Key West, Florida to Fort Kent, Maine for a total of 2,390 miles (3,846 km). Although it has the lowest number and should, in theory, be along the Atlantic Ocean, US 13 and US 17 at times are between US 1 and the ocean. The highway parallels the later Interstate 95 for much of its length and serves numerous cities along the east coast.

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