Ohio Rev. Code § 940.04
Each soil and water conservation district shall be administered by a board consisting of the five supervisors. Elections of supervisors shall be conducted by the Ohio soil and water conservation commission pursuant to rules it adopts under Chapter 119. of the Revised Code. The term of each supervisor shall be for three years. Due notice of election of supervisors shall be given by the commission. Successors to fill unexpired terms may be appointed by the commission on the unanimous recommendation of the remaining supervisors. In any case in which a unanimous recommendation cannot be agreed upon, a successor to fill an unexpired term shall be elected in the same manner in which the supervisor's predecessor was elected.
Eligible voters and candidates for supervisor shall be at least eighteen years of age by the day of election. Candidates shall reside in the district in which the y are running for office.
R.C. § 940.04