Colorado is a U.S. state encompassing most of the Southern Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains. Colorado is part of the Western United States, the Southwestern United States, and the Mountain States. Wikipedia

Wyoming is a state in the mountain region of the Western United States. Wyoming is the 10th most extensive, but the least populous and the second least densely populated of the 50 United States. Wikipedia