(a) A municipal planning commission in a Class I, II or III city shall have not less than five nor more than fifteen members, the exact number to be specified in the ordinance creating the planning commission. A municipal planning commission in a Class IV town or village shall have not less than three nor more than nine members, the exact number to be specified in the ordinance creating the planning commission.
(b) The members of a municipal planning commission must be:
(1) Residents of the municipality; and