• Year First Flown: 1911
• Designed By: Andrew Carlisle Johnson
• Design: The flag is made up of three equally sized horizontal stripes. The top and bottom stripe are a dark blue and the middle stripe is white. On the left side of the flag there is a red letter "C" with a yellow circle filling in the middle of the "C".
• Meaning: The blue stripes signify the blue Colorado skies. The white stripe represents the snow of the Colorado Mountains. The yellow circle symbolizes gold and the red stands for the soil of the Colorado land. And finally, the "C" (obviously) stands for "Colorado".

In 1803, the United States bought the land that is now called Colorado with the Louisiana Purchase. Over the years this land was a part of many different territories including: Indiana Territory, Louisiana Territory, Missouri Territory, Utah Territory, New Mexico Territory, Nebraska Territory, and Kansas Territory. Finally, on February 28th, 1863, the land that is now the state of Colorado was declared the Colorado Territory. On August 1st, 1876, Colorado became the 38th state of the United States of America. Thirty-five years later, on June 5th of 1911, adopted an official state flag. The flag was designed by Andrew Carlisle Johnson, but it is not known what size he originally made the "C" on the flag. The legislature that officially adopted the flag did not specify the size that Johnson made his "C" or the exact shade of blue and red that should be used in the flag. Because of this ambiguity, many different versions of the Colorado state flag were produced with varying "C" sizes and colors. Part of this problem was fixed on February 28th, 1929, when the General Assembly declared that the blue and red in the flag were supposed to be the same color as those used in the American Flag. The other part of the problem was amended on March 31st, 1964, when it was declared that the diameter of the gold circle within the "C" would be equal to the height of the center stripe.