Mo. Rev. Stat. § 64.020
Such county planning commission shall consist of one of the commissioners of the county commission selected by the county commission, the county highway engineer, the chairman of two municipal planning bodies in the county to be appointed by the county commission, all of whom shall serve during their tenure of office not to exceed four years, and six residents of the unincorporated territory of the county to be appointed by the county commission. The term of said six appointed members shall be four years or until their successor takes office except that the original term of three of said six appointed members shall be two years. All members of the county planning commission shall serve as such without compensation; but an attendance fee as reimbursement for expenses may be paid to the appointed members of the county planning commission in an amount, as set by the county commission, not to exceed ten dollars per meeting for not over two meetings per month. The planning commission shall elect its chairman from among the appointed members.
§ 64.020, RSMo