New Mexico State Road 21, is a state highway

State highway

State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...

 located entirely in Colfax County

Colfax County, New Mexico

-2010:Whereas according to the 2010 U.S. Census Bureau:*83.8% White*0.5% Black*1.5% Native American*0.4% Asian*0.1% Native Hawaiian or Pacific Islander*3.6% Two or more races*10.1% Other races*47.2% Hispanic or Latino -2000:...

. The road starts in the center of the town of Cimarron

Cimarron, New Mexico

-Demographics:As of the census of 2000, there were 917 people, 382 households, and 255 families residing in the village. The population density was 479.5 people per square mile . There were 449 housing units at an average density of 234.8 per square mile...

 at the Intersection of U.S. Route 64

U.S. Route 64

U.S. Route 64 is an east–west United States highway that runs for 2,326 miles from eastern North Carolina to just southwest of the Four Corners in northeast Arizona. The western terminus is at U.S. Route 160 in Teec Nos Pos, Arizona. The highway's eastern terminus is at NC 12 and U.S. Route...

 and Collision Avenue. It goes southward as South Collision Avenue. Leaving town limits it is called the Santa Fe Trail and passes by the well known Philmont Scout Ranch

Philmont Scout Ranch

Philmont Scout Ranch is a large, rugged, mountainous ranch located near the town of Cimarron, New Mexico, covering approximately of wilderness in the Sangre de Cristo Mountains of the Rocky Mountains of northern New Mexico...

 when it junctions with Cito Road and Conejo Road. On the road you can view the Tooth of Time

Tooth of Time

The Tooth of Time is an igneous intrusion of dacite porphyry formed in the Tertiary period of the Cenozoic era some 22-40 million years ago. The Tooth is located five miles southwest of Cimarron, New Mexico, USA and is on the property of Philmont Scout Ranch, and is one of Philmont's most popular...

 and drive by the Villa Philmonte

Villa Philmonte

The Villa Philmonte is a large ranch manor located outside of Cimarron, New Mexico, on the Philmont Scout Ranch property of the Boy Scouts of America....

 mansion and the Seton Memorial Library.

The road continues to drive along Philmont property until it reaches Rayado

Rayado, New Mexico

Rayado or Reyado was the first permanent settlement in Colfax County, New Mexico, United States and an important stop on the Santa Fe Trail.- Overview :...

. In Rayado, the road turns south and continues past rustic ranches until it reaches a Y-intersection with north bound New Mexico State Road 199. The road (then having two numbers, 21 & 199) heads east towards the ranches at Miami

Miami, New Mexico

Miami is an unincorporated community in Colfax County, New Mexico, United States.Miami lies on State Road 21 and is in between Springer and Sunny Side...

. It then goes 1.5 miles (2.4 km) east, turns north for 1.7 miles (2.7 km) where it joins County Road 6 from Rayado. About 9 miles (14.5 km) eastward of that intersection it goes underneath I-25

Interstate 25 in New Mexico

In the U.S. state of New Mexico, Interstate 25 follows the north–south corridor through Albuquerque and Santa Fe. It replaced U.S. Route 85, which is no longer signed, but still exists in route logs sharing the I-25 alignment. I-25 starts in New Mexico at an interchange with I-10 in Las Cruces and...

 near exits 412 and 414. The road goes immediately into the town of Springer

Springer, New Mexico

Springer is a town in Colfax County, New Mexico, United States. The population was 1,285 at the 2000 census. It was the Colfax County county seat from 1882—1897. Springer was part of the Lucien B. Maxwell land grant. It is near the Cimarron Cutoff of the Santa Fe Trail...

, where it is called West 4th Street, which is where it reaches its end at Maxwell Avenue.