North Dakota Highway 21

North Dakota Highway 21 (ND 21) is an east-west highway in North Dakota. The eastern terminus is at ND 6 about 5 mi north of Breien and the western terminus is at U.S. Route 85 (US 85) about 5 mi east-northeast of Amidon. The highway is known for the large number of abandonments located along it.

History
The current ND-24 segment between ND-6 and the current ND-24/ND-1806 junction was originally part of ND-21. This segment was renumbered between 1950 and 1963.