Mo. Rev. Stat. § 262.570

On or before October 1, 1961, or of any year thereafter, the university shall file with the county commission in each county in which there is to be established a council an instrument setting forth the boundaries of each district within the county established for the purpose of electing members to the council. The districts in each county shall be consecutively numbered from one. A copy thereof shall be published within fifteen days after it is filed. If the districts as originally established are at any time thereafter altered or changed, the university shall, on or before the first day of July, file with the county commission an instrument setting forth the change in the districts and the boundaries thereof and like notice as above provided shall be given of such change.