Ohio Rev. Code Ann. § 3501.21

When the board of elections considers it necessary to change, divide, or combine any precinct or to relocate a polling place, it shall notify, prior to the next election, each of the registrants in the precinct of the change by mail. On and after August 1, 2000, when the board changes the boundaries of any precinct, it shall notify the secretary of state of the change not later than forty-five days after making the change.