Mo. Rev. Stat. § 256.645
Within thirty days of August 28, 1992, the governing body of each county listed in section 256.643 shall adopt a plan for the county establishing the precise boundary of that portion of the county to be included in the district. The governing body of each county adopting a plan shall direct the clerk of the county court to call a meeting of the owners of real estate of one acre or more per parcel situated in that county. Notice shall be given by publication once a week for three consecutive weeks in some newspaper of general circulation in the county at least ten days before the day of the meeting. The notice shall specify the meeting day, time, and place in the county; and that the purpose of the meeting is to determine whether the qualified voters wish to become a part of the district, and if so, to elect commissioners.
§ 256.645, RSMo