Lowest-numbered route you haven't been on

[Konza]

Just got home from the Midwest and, on the way back, managed to do some wandering in, among others, a few states that identify with bluegrass, buckeyes, and pelicans.

Accordingly I have now traveled the following routes:

623:  Louisiana
624:  Kentucky
625, 626, 627, 628:  Louisiana
629:  Kentucky
630:  Interstate (AR)
631, 632, 633:  Louisiana
634:  Ohio
635:  Interstate (KS/MO & TX)
636, 637:  Louisiana
638, 639:  Kentucky
640:  Interstate (TN)
641:  US
642:  Louisiana
643:  Ohio
644:  Louisiana
645:  Indiana
646:  Kentucky
647:  Nevada
648:  Maryland
649:  Kentucky
650:  Indiana
651:  Ohio
652:  Louisiana
653:  Nevada
654:  Louisiana
655, 656:  Florida
657:  Louisiana
658:  Kentucky
659:  Nevada
660, 661, 662:  Louisiana
663:  Kentucky
664:  Interstate (VA)
665:  Kentucky
666:  Ohio
667:  Nevada
668:  Louisiana
669:  Ohio
670:  Interstate (KS/MO)
671, 672:  Kentucky
673, 674:  Louisiana
675:  Interstate (OH)
676:  Interstate (PA/NJ)
677:  Louisiana
678:  Interstate (NY)
679:  Louisiana
680:  Interstate (CA, NE)
681:  Ohio
682:  Louisiana
683:  Ohio
684:  Interstate (NY)
685:  Louisiana
686:  Kentucky
687:  Ohio
688:  Florida
689:  Kentucky
690:  Tennessee
691:  Ohio
692, 693:  Kentucky
694:  Interstate (MN)
695:  Interstate (MD)
696:  Interstate (MI)
697:  Ohio
698:  Kentucky
699, 700:  Louisiana
701, 702:  Kentucky
703:  Ohio
704:  Kentucky
705:  Louisiana
706:  Kentucky
707:  Ohio
708:  Louisiana
709:  Ohio
710:  Interstate (CA)
711, 712:  Louisiana
713:  Florida
714:  Louisiana
715:  Pennsylvania
716:  Ohio
717:  Florida
718:  Ohio
719, 720:  Louisiana
721:  Ohio
722:  Kentucky
723, 724:  Louisiana
725:  Ohio
726:  Louisiana
727:  Indiana
728:  Kentucky
729:  Louisiana
730:  Ohio
731, 732:  Kentucky
733:  Louisiana
734:  Ohio
735:  Kentucky
736:  Ohio
737:  Louisiana
738, 739:  Kentucky
740:  Missouri
741:  Ohio
742, 743, 744, 745, 746:  Louisiana
747:  Ohio
748, 749:  Louisiana
750:  Ohio
751: Louisiana
752:  Missouri
753:  Ohio
754, 755:  Louisiana
756:  Ohio
757, 758:  Louisiana
759:  Missouri
760, 761:  Louisiana
762:  Ohio
763:  Missouri
764:  Ohio
765:  Missouri
766, 767, 768, 769:  Kentucky

Accordingly, please update my number to 770.  There's one in a clump of similarly numbered routes in LA but I ran out of time and desire to find my way to it this trip.

We will continue to seek opportunities to extend this list.