Length: 237 mi. Direction: south-north. North Dakota Highway 18 (ND-18) is a highway in the eastern part of North Dakota that begins south of Gretna at the Canadian border, and ends close to Claire City. The road stretches across the counties of Pembina, Walsh, Grand Forks, Traill, Cass, Richland, and Roberts. It was inaugurated in 1939.
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