In 1962, the Ohio Department of Highways implemented the system of Interstate Highways that had been approved by the states in 1956.
The State Route numbers 70, 71, 74, 75, 77, 80, 90, 270, 271, 275, 277, 280, 290, 675, and 680 conflicted with new designations, so the State Routes with those numbers were renumbered.
NewOldFromToCincinnatiAthens (subsequently extended to West Virginia border at Belpre)CovingtonGreenfieldGreenfieldAberdeenVermilionLoudonville (SR 60 overlaps SR 39 to east of Nashville)East of Nashville (SR 60 overlaps SR 39 to east of Nashville)West Virginia border in MariettaAkronWest LafayetteWest LafayetteIrontonNorth KingsvillePetersburgPetersburgCalcuttaEdinburgSandyvilleChillicotheMount SterlingPerrysburgPerrysburg (Fort Meigs State Memorial)RosewoodMarysvilleSalem TownshipWayne TownshipTrimbleAmesvilleAmesvilleGuysvilleMartinsburgBirminghamIndianaNew CarlisleMineralReedsvilleBuchtelTrimble TownshipStone CreekWest LafayetteWashington Court HouseGreenfieldGreenfieldSouth of CynthianaSouthwest of ShreveEast of Nashville
Other renumberings due to new interstate designations after 1962 In 1972, due to the designation of I-76 in Ohio, Ohio State Route 76 had the part north of Beverly renumbered to Ohio State Route 83 and the rest became a southward extension of Ohio State Route 339. In 1973, due to the designation of I-670 in Ohio, Ohio State Route 670 had the portion east of Ohio State Route 313 become an extension of it and the rest was renumbered to Ohio State Route 761.
See also Numbered highways in Ohio
References