(1) In counties not under township organization, a registered voter may file a petition or petitions for the submission of the question regarding the number of commissioners on the county board. The petition or petitions shall be signed by registered voters equal in number to five percent of the voters registered in the county at the preceding statewide general election.
(2) When the petition or petitions are filed in the office of the county clerk or election commissioner not less than seventy days before the date of any general election, the county clerk or election commissioner shall cause the question to be submitted to the voters of the county at such election and give notice thereof in the general notice of such election. The forms of ballots shall be respectively: For three commissioners and For five commissioners; and the same shall be printed upon the regular ballots cast for officers voted for at such election and shall be counted and canvassed in the same manner.
(3) If a majority of votes cast at the election favor the proposition For five commissioners, thereafter the county shall have five commissioners, and if a majority of the ballots cast at the election favor the proposition For three commissioners, thereafter the county shall have three commissioners.