Mo. Rev. Stat. § 10.020
The official flag of the state of Missouri is rectangular in shape and its vertical width is to the horizontal length as seven is to twelve. It has one red, one white and one blue horizontal stripe of equal width; the red is at the top and the blue at the bottom. In the center of the flag there is a band of blue in the form of a circle enclosing the coat of arms in the colors as established by law on a white ground. The width of the blue band is one-fourteenth of the vertical width of the flag and the diameter of the circle is one-third of the horizontal length of the flag. In the blue band there are set at equal distances from each other twenty-four five-pointed stars. The original copy of the design shall be kept in the office of the secretary of state. The flag shall conform to the design set out on page xxii.
§ 10.020, RSMo