Ohio Rev. Code Ann. § 4504.24
(A)
(1) The board of county commissioners of a county may, by resolution, levy an annual license tax upon the operation of motor vehicles on the public roads and highways in that county for any authorized purpose. A tax levied under this section is in addition to the tax levied by sections 4503.02 and 4503.07 of the Revised Code and any other tax levied under this chapter. The tax shall be at the rate of five dollars per motor vehicle on all motor vehicles the district of registration of which is located in the county levying the tax, as defined in section 4503.10 of the Revised Code. The rate of the tax is in addition to the tax rates prescribed in sections 4503.04 and 4503.042 of the Revised Code and is subject to both of the following:
(2) As used in division (A)(1) of this section, "authorized purpose" means any of the following: