Mo. Rev. Stat. § 162.281
Except as provided in section 162.563, in all seven-director districts, including urban districts, when directors are to be elected for terms of different lengths, each candidate shall declare for a term of a specific number of years and the different terms shall be voted upon as separate propositions.
(L. 1963 p. 200 § 3-28, A.L. 2022 S.B. 681 & 662)