Colorado is a state in the Mountain West subregion of the Western United States. It encompasses 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 the eighth most extensive and 21st most populous U.S. state. Denver is the capital of and most populous city in Colorado. The flag of Colorado was designed by Andrew Carlisle Carson[a] and officially adopted to represent the U.S. state of Colorado on June 5, 1911. It consists of a fess design of three horizontal stripes of equal width, with the top and bottom stripes colored blue, and the middle stripe colored white. A circular red “C”, filled with a golden disk, sits atop the stripes. All aspects of the flag contain symbolism related to the state, as the blue is meant to represent the sky, the gold the abundant sunshine the state receives, the white the snowcapped Rocky Mountains, and the red the “ruddy” earth. The gold and white portions of the flag also represent the state’s gold and silver mining industries, respectively. 4K Resolution.