Ohio Rev. Code Ann. § 4509.15

The security required under section 4509.12 of the Revised Code shall be in the form of money, or bonds of the United States, or of this state, or a political subdivision of this state, at their par or face value, or a corporate surety bond of a surety licensed to do business in this state, in such amount as the registrar of motor vehicles may require, but in no case involving personal injury in an amount less than five hundred dollars, or in excess of the limits specified in section 4509.20 of the Revised Code.