North Dakota Highway 40

North Dakota Highway 40 (ND 40) is a north–south highway located in northwestern North Dakota. The 63.450 mi route traverses an area from US Highway 2 (US 2) near Tioga, in eastern Williams County, to the Canadian border where it continues as Saskatchewan Highway 47 (Hwy 47) in northern Divide County.

Route description
ND 40 begins at a junction with US 2 south of Tioga, in eastern Williams County. It passes through that town and then begins a brief concurrency with ND 50 in McGregor.

ND 40 and ND 50 together enter Burke County. ND 40 leaves the concurrency in Battleview by turning northward to ND 5 in Columbus, and then turns west to run concurrently with that highway.

ND 40, with ND 5, enters Divide County, and then ND 40 leaves the concurrency with a turn at Noonan, 15 mi east of Crosby. While in Noonan, it crosses an alignment of railroad tracks before continuing north. About 7 mi later, ND 40 ends at the Canadian border. The road continues beyond the port of entry and the Noonan-Estevan Highway Border Crossing as Hwy 47 on its way to Estevan, Saskatchewan.