Wikipedia:WikiProject U.S. Roads/Ohio/All-time list

Given are the years of the first and last official maps the routes appear on. These are not always the exact years the routes were created or eliminated.

There is a relatively long gap in the 1930s for 9 (and maybe 237 and 255). Given that (before the large expansion in 1937-) all other numbers were reused within a year or two, there may be a missing version of 9 here. Also, there may be a missing version of 11 and 92 here, because 200 was reused by 1938.

I can't find the following numbers before 1941: 574 583 588 593 594 597 599 607 610 620 624 639 641 642 645 648 649 650 652 653 654 659 667 679 681 685 688 693 700 710 711 712 713 717 719 728 731 733 735 737 738 740 742 754 755 758 759 760 761 764 765 766 767 768 769 777 778 779 782 783 784 786 787 789 791 799; 633 was first shown in 1939, but not numbered until 1946; 525 is not labeled on any maps, but was probably Lake Avenue in Ashtabula

601 608 623 691 697 709 741 762 763 774 776 796 were first shown in 1938; 523 529 568 573 580 586 616 651 655 671 695 715 723 730 788 797 798 were first shown in 1939; 582 702 were first shown in 1940; 621 was first shown in 1941 (these may or may not be original)