Ohio Rev. Code § 6115.10
Within thirty days after entering the decree incorporating a sanitary district, providing the district is wholly within one county, the court shall appoint one person who shall be a resident elector within the district as a director of the district for a term of five years from the date of the person's appointment. If the district is composed of more than one county or part thereof, each county is entitled to one director who shall be a resident elector of that county. In no event shall there be more than one director for each county. Except as otherwise provided in section 6115.103 of the Revised Code, the court shall fill all vacancies that occur in the office of director. However, the board of directors of a sanitary district organized after October 9, 1981, wholly for the reduction of populations of biting arthropods shall be composed and appointed in accordance with section 6115.101 of the Revised Code, and the board of directors of a sanitary district organized wholly for the purpose of providing a water supply for domestic, municipal, and public use that includes two municipal corporations in two counties shall be composed and appointed in accordance with section 6115.103 of the Revised Code.
R.C. § 6115.10