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*'''1924''' – Original route established<ref name=system> (The Unofficial Ohio State Highways Web Site) by John Simpson</ref>. Originally routed from ] to ] along its current alignment and along ] from ] to Bellevue<ref name=ohhwys> (The Unofficial Ohio State Highways Web Site) by John Simpson</ref>.
*'''1924''' – Original route established<ref name=system> (The Unofficial Ohio State Highways Web Site) by John Simpson</ref>. Originally routed from ] to ] along its current alignment and along ] from ] to Bellevue<ref name=ohhwys> (The Unofficial Ohio State Highways Web Site) by John Simpson</ref>.
*'''1926''' – Truncated at Republic; alignment to Bellevue certified as State Route 18<ref name=ohhwys/>.
*'''1926''' – Truncated at Republic; alignment to Bellevue certified as State Route 18<ref name=ohhwys/>.
*'''1961''' – Extended {{convert|2|mi|km}} south from Wapakoneta (from its terminus at the former alignment of ]) to its current terminus via apreviouslyunnumbered road<ref name=ohhwys/>.
*'''1961''' – Extended {{convert|2|mi|km}} south from Wapakoneta (from its terminus at the former alignment of ]) to its current terminus via Auglaize Co. 25-A<ref name=ohhwys/>.
1924 – Original route established. Originally routed from Wapakoneta to Bellevue along its current alignment and along State Route 18 from Republic to Bellevue.
1926 – Truncated at Republic; alignment to Bellevue certified as State Route 18.
1961 – Extended 2 miles (3.2 km) south from Wapakoneta (from its terminus at the former alignment of U.S. Route 33) to its current terminus via Auglaize Co. 25-A.