Ohio Rev. Code § 2101.46
After three years from the date of an election held under sections 2101.43 to 2101.45, inclusive, of the Revised Code, another election may be petitioned for and shall be ordered by the judge of the court of common pleas as provided in such sections either to perfect a combination of said court or to dissolve said combination and re-establish the probate court.
Whenever in any county where such courts have been combined a decennial federal census shows that such county has a population of sixty thousand or more, and such fact is certified by the secretary of state to said court of common pleas and entered upon its journal, the probate court shall be re-established in such county. A probate judge shall be elected for the regular term at the next election ensuing in an even-numbered year, and the records of the probate division of the court of common pleas shall be delivered to such re-established probate court upon the entry into office of an elected probate judge.
R.C. §2101.46