Iowa Code § 331.208: Plan “one” terms of office.

If plan “one” is selected pursuant to section 331.206 or 331.207, the board shall be elected as provided in this section.

1. In the primary and general elections, the number of supervisors, or candidates for the offices, which constitutes the board in the county, shall be elected by the registered voters of the county at large without district residence requirements.

2. In counties with three county supervisors, one person shall be elected as a member of the board for an initial term of two years and two persons shall be elected as members of the board for four years.

3. In counties with five supervisors, two persons shall be elected as members of the board for initial terms of two years and three persons shall be elected as members of the board for four years.

4. The determination as to whether a term of office shall be for two or four years shall be decided by lot before the primary election, and the results of the determination indicated on the ballot in the primary and general elections.