(b) When a municipality has not been divided into wards or election districts, there shall be at least five councilmen, but when the municipality has been divided into wards or election districts, the governing body may, by ordinance, determine the number of councilmen to be elected from each ward or election district. When it is deemed necessary, the governing body may, by ordinance, increase the number of wards or election districts and change the boundaries thereof, such wards or election districts to be made as nearly equal as may be, in population, and when the municipality shall be divided into wards or election districts, or there shall be an increase in the number of wards or election districts as aforesaid, the governing body may increase the number of councilmen and direct an election to be held at the next regular municipal election in such ward or wards or election district or districts so that each ward or election district may have its full number of councilmen residing therein and may have equal representation on the governing body. When a municipality has been divided into wards or election districts, the governing body may, by ordinance, also provide for the election of councilmen at large in addition to the councilmen to be elected from each ward or election district. The provisions of this subsection shall be applicable to any municipality except to the extent otherwise provided in the charter of such municipality.
(c) Unless otherwise provided by charter provision or ordinance, the mayor, recorder and councilmen must be residents of the municipality and must be qualified voters entitled to vote for members of its governing body. A city manager in a manager form of government need only be a resident of the city at the time of his or her appointment.