| State: | ND |
| Type: | ND |
| Route: | 40 |
| Maint: | NDDOT |
| Map Custom: | yes |
| Length Mi: | 63.450 |
| Length Ref: | [1] |
| Established: | 1926 |
| Direction A: | South |
| Terminus A: | near Tioga, North Dakota |
| Junction: |
|
| Direction B: | North |
| Terminus B: | at the Canadian border |
| Previous Type: | ND |
| Previous Route: | 38 |
| Next Type: | ND |
| Next Route: | 41 |
North Dakota Highway 40 (ND 40) is a north–south highway located in northwestern North Dakota. The 63.45adj=midNaNadj=mid 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.[2]
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.[3]
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, east of Crosby. While in Noonan, it crosses an alignment of railroad tracks before continuing north. About 7miles 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.[4] [5]