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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.