Ohio Rev. Code § 3517.03
The controlling committees of each major political party or organization shall be a state central committee consisting of two members, one a man and one a woman, representing either each congressional district in the state or each senatorial district in the state, as the outgoing committee determines; a county central committee consisting of one member from each election precinct in the county, or of one member from each ward in each city and from each township in the county, as the outgoing committee determines; and such district, city, township, or other committees as the rules of the party provide.
All the members of such committees shall be members of the party and shall be elected for terms of either two or four years, as determined by party rules, by direct vote at the primary held in an even-numbered year. Except as otherwise provided in section 3517.02 of the Revised Code, candidates for election as state central committee members shall be elected at primaries in the same manner as provided in sections 3513.01 to 3513.32 of the Revised Code for the nomination of candidates for office in a county. Candidates for election as members of the county central committee shall be elected at primaries in the same manner as provided in those sections for the nomination of candidates for county offices, except as otherwise provided in sections 3513.051 and 3517.02 of the Revised Code.
Each major party controlling committee shall elect an executive committee that shall have the powers granted to it by the party controlling committee, and provided to it by law. When a judicial, senatorial, or congressional district is comprised of more than one county, the chairperson and secretary of the county central committee from each county in that district shall constitute the judicial, senatorial, or congressional committee of the district. When a judicial, senatorial, or congressional district is included within a county, the county central committee shall constitute the judicial, senatorial, or congressional committee of the district.
A minor political party may elect controlling committees at a primary election in the even-numbered year by filing a plan for party organization with the secretary of state on or before the ninetieth day before the day of the primary election. The plan shall specify which offices are to be elected and provide the procedure for qualification of candidates for those offices. Candidates to be elected pursuant to the plan shall be designated and qualified on or before the ninetieth day before the day of the election. Such parties may, in lieu of electing a controlling committee or other officials, choose such committee or other officials in accordance with party rules. Each such party shall file the names and addresses of members of its controlling committee and party officers with the secretary of state.
R.C. § 3517.03