Ohio Rev. Code Ann. § 5501.22

The director of transportation shall not be suable, either as a sole defendant or jointly with other defendants, in any court outside Franklin county except in actions brought by a railroad company under section 4957.30 of the Revised Code, or by a property owner to prevent the taking of property without due process of law, in which case suit may be brought in the county where such property is situated, or in any action otherwise specifically provided for in Chapters 5501., 5503., 5511., 5512., 5513., 5515., 5516., 5517., 5519., 5521., 5523., 5525., 5527., 5528., 5529., 5531., 5533., and 5535. of the Revised Code.