U.S. Route 56 (US 56) is an east–west United States highway that runs for approximately in the Midwestern United States. US 56's western terminus is at Interstate 25 Business (I-25 Bus.), US 412 and New Mexico State Road 21 (NM 21) in Springer, New Mexico and the highway's eastern terminus is at US 71 in Kansas City, Missouri. Much of it follows the Santa Fe Trail. Route description The highway passes through New Mexico, Oklahoma, Kansas, and Missouri. The eastbound shoulder also touches a corner of Texas at a small road junction near the New Mexico/Oklahoma border. New Mexico US 56 runs concurrent with US 412 for its entire length in New Mexico, and are signed as such through the state. The two routes begin in Springer and head east towards Abbot, where they serve as the northern terminus of State Road 39. Continuing east, US 56/412 meet the southern terminus of NM 193 south of Farley, the northern terminus of NM 120 east of Gladstone, and the southern terminus of NM 453. US 56/412 intersect US 64 and US 87 in Clayton, New Mexico, and US 64 joins with US 56/412 in their trek northeast. The three routes serve as the southern terminus of NM 406 as they enter the Kiowa National Grassland. The three routes then cross into Oklahoma together. Oklahoma US-56's short path through Oklahoma consists of a diagonal slice across the western part of the Oklahoma Panhandle. US-56/64/412 enter Oklahoma near the southwest corner of the Panhandle, where they also enter Rita Blanca National Grassland. They leave the grassland near Felt. Three miles (4.8 km) southwest of Boise City, US-385 joins the concurrency. The routes then enter Boise City, where they enter a traffic circle around the Cimarron County Courthouse that involves US-56, US-64, US-385, US-412, State Highway 3, and SH-325. After leaving the traffic circle, US-56 overlaps US-64, US-412, and SH-3. east of the courthouse, US-56 meets US-287 at an interchange. US-56/64/412/SH-3 continue northeast for , where US-56 splits to travel northeast on its own. The route parallels the Cimarron Valley Railroad for the remainder of its time in Oklahoma. Keyes is the next town on US-56, and it also serves as the northern terminus of SH-171 where the two highways intersect. US-56 crosses into Texas County east of Sturgis. Just before crossing the Kansas line, US-56 meets the north end of SH-95. US-56 then