The flag of Colorado was officially adopted to represent the U.S. state of Colorado on June 5, 1911. The flag, designed by Andrew Carlisle Carson, 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.

The Great Seal of the State of Colorado is an adaptation of the territorial seal which was adopted by the First Territorial Assembly on November 6, 1861. The only changes made to the territorial seal design being the substitution of the words "State of Colorado" and the figures "1876" for the corresponding inscriptions on the territorial seal. The first General Assembly of the State of Colorado approved the adoption of the state seal on March 15, 1877. The Colorado Secretary of State alone is authorized to affix the Great Seal of Colorado to any document whatsoever.