Ohio Rev. Code § 3311.07
When a local or exempted village school district contains within its territorial boundaries the major portion of the territory lying within the corporate limits of a village advanced to a city, such school district may be BY a majority vote of the full membership of such board of education, declare that such local or exempted village school district shall become a city school district, such change to become effective the next succeeding first day of July.
In the event a minor portion of the territory lying within the corporate limits of a village advanced to a city is contained within the territorial boundaries of a local or exempted village school district other than the school district containing the major portion of the territory lying within the corporate limits of such village, such territory shall remain a part of such local or exempted village school district until transferred to another school district.
R.C. §3311.07