Ohio Revised Code Title VII. Municipal Corporations § 705.52

(A) A municipal corporation having not more than ten thousand inhabitants, five;

(B) More than ten thousand and not more than twenty-five thousand inhabitants, seven;

(C) More than twenty-five thousand inhabitants, nine.

All councilmen shall serve for a term of four years. At the first election in municipal corporations having five councilmen, the three candidates having the highest number of votes shall serve for four years and the two candidates having the next highest number of votes shall serve for two years. In municipal corporations having more than five councilmen, a majority of those elected having the highest number of votes shall serve for a period of four years and the others shall serve for a period of two years. Vacancies in the council shall be filled by the council for the remainder of the unexpired term, but any vacancy resulting from a recall election shall be filled in the manner provided in section 705.92 of the Revised Code.