History
Ohio 309's current route was the route of U.S. Route 30S until that split was decertified in 1975. Under Ohio numbering custom, the 400 series of numbers was traditionally used to renumber decertified and remnant highways. However, State Route 430 had already been certified from Mansfield to Mifflin as a remnant of US 30. Despite the fact that Ohio 430 ended on US 30S, it was decided that US 30S would be recertified with a new number that looked similar to 30S, so it would not confuse travelers of the route. The route was thus certified as SR 309.
The only significant change of the route since this certification is its western terminus, which originally was with U.S. 30 in Delphos. When U.S. 30's bypass around Delphos was completed in 1981, Ohio 309's western terminus was made the easternmost interchange of the bypass.
Before being used as its current route, the route number 309 was used as the route number of what is now State Route 541. It was replaced with the now defunct State Route 271 in 1936.
Read more about this topic: Ohio State Route 309
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