Ohio Rev. Code § 5533.27
The road known as United States route number twenty-three, running in a north and south direction, commencing at the point of interchange with state route number one hundred fifty-nine in Ross county and extending to the point of interchange with the state route number one hundred four in Ross county, through the municipal corporation of Chillicothe; and the road known as the United States route number thirty-five, running in a northwesterly and southeasterly direction, commencing at the point of the Scioto river bridge northwest of Chillicothe in Ross county and extending to the point of the Scioto river bridge southeast of Chillicothe in Ross county, through the municipal corporation of Chillicothe, shall both be known as the "Great Seal Memorial Highway."
The director of transportation shall erect suitable markers upon said highway indicating its name.
R.C. §5533.27