State Road 406
NM 406 highlighted in red
Route information
Maintained by NMDOT
Length	35.145 mi[1] (56.560 km)
Major junctions
South end	US 56 / US 64 / US 412 near Clayton
Major intersections	NM 411 NM 410 near Moses
North end	NM 456 west of Kenton, OK
Location
Country	United States
State	New Mexico
Counties	Union
Highway system
New Mexico State Highway System Interstate US State Scenic
← NM 404 → NM 408

State Road 406 (NM 406) is a 35.145-mile-long (56.560 km) state highway in Union County, New Mexico, United States. NM 406's southern terminus is at U.S. Route 56/64/412 near Clayton, and the northern terminus is at NM 456 near the Oklahoma border. The route stays entirely within Union County.

SR 406 begins at an intersection with US 56, US 64, and US 412 in a concurrency. The road then heads north, passing by a few farms. At an intersection with County Route A055, the route turns right toward the Oklahoma border. The road zigzags north and east again to an intersection with SR 410, which heads east toward Wheeless, Oklahoma. At SR 410, SR 406 again turns back north and hugs the Oklahoma border. The road then winds slightly passing through a mountainous terrain. It terminates at SR 456, which heads east as Oklahoma State Highway 325 toward Kenton.^[2]

The entire route is in Union County.

Location	mi[3]	km	Destinations	Notes
​	0.000	0.000	US 56 / US 64 / US 412 / Santa Fe Trail Scenic Byway – Clayton, Boise City	Southern terminus
​	3.212	5.169	NM 411 east	Western terminus of NM 411
​	21.489	34.583	NM 410 east / Santa Fe Trail Scenic Byway – Wheeless	Western terminus of NM 410
​	35.145	56.560	NM 456 – Folsom, Kenton	Northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

• U.S. Roads portal

Geographic data related to New Mexico State Road 406 at OpenStreetMap