Ohio Rev. Code Ann. § 5713.16

When the title papers are produced to the county auditor, he may plat, allot, and number said subdivisions. The plat made by the auditor shall be recorded upon the records of deeds of the county. After it has been platted and numbered by the auditor, or by the county engineer, it shall be sufficient for all purposes of taxation to enter such subdivisions upon the duplicate by their numbers, as provided by law for separate parcels of land, and such entry shall be a sufficient description of such subdivisions.