In 1923, Ohio renumbered almost all of its state highways in order to simplify the system.
OldNewNowFromToUS 40IndianaPennsylvaniaUS 20ClevelandPennsylvaniaUS 6ClevelandSanduskyUS 23ColumbusWaldoSR 98WaldoBucyrusSR 4BucyrusSanduskyUS 23PortsmouthColumbusSR 142, US 42West JeffersonSharonvilleUS 52, SR 7CincinnatiPomeroySR 124HockingportLittle HockingSR 7Little HockingEast LiverpoolSR 39East LiverpoolPennsylvaniaUS 50, SR 28CincinnatiChillicotheUS 50MilfordHillsboroSR 3/US 22CincinnatiWashington Court HouseUS 22Washington Court HouseZanesvilleUS 25 (former)ToledoMichiganSR 14ClevelandSalemSR 45SalemLisbonUS 30LisbonEast LiverpoolSR 7HubbardConneautSR 289YoungstownPennsylvaniaUS 322ClevelandPennsylvaniaSR 8AkronClevelandSR 21ClevelandMassillonSR 18 (former)Akron (east of)YoungstownUS 42CincinnatiSharonvilleUS 25 (former)SharonvilleFranklinUS 25 (former)FranklinDaytonSR 2ToledoWauseonUS 20, SR 120ToledoIndianaUS 25 (former)LimaFindlaySR 12, US 6FindlaySanduskyUS 62ColumbusMillersburgSR 3ColumbusWoosterSR 3, US 42ClevelandWoosterUS 22SteubenvilleCambridgeSR 201DaytonBrandtSR 235East of BrandtLakeviewUS 35DaytonEatonSR 122EatonIndianaUS 35DaytonChillicotheSR 125CincinnatiWest UnionUS 20ClevelandElyriaSR 94, SR 3ClevelandMedinaUS 422ClevelandChagrin Falls (west of)SR 87Chagrin Falls (west of)BurtonUS 6EuclidChardonUS 422Chagrin Falls (west of)ParkmanSR 88ParkmanPennsylvaniaSR 82TwinsburgElyria (south of)SR 237, Eastland Road, Fowles RoadRocky RiverBerea (east of)SR 264, US 50CincinnatiIndianaUS 127CincinnatiHamiltonUS 27, SR 126CincinnatiIndianaSR 32CincinnatiBataviaUS 52CincinnatiIndianaSR 4CarthageHamiltonSR 128HamiltonClevesSR 126DunlapSpringdaleSR 126GlendaleMilfordSR 16ColumbusNewarkUS 33ColumbusMarysvilleUS 33ColumbusLancasterSR 3/US 62ColumbusWashington Court HouseUS 24ToledoNapoleonSR 51ToledoSoutheast of WoodvilleSR 65ToledoPerrysburgSR 65PerrysburgGrand RapidsSR 51ToledoMichiganSR 246, Secor RoadToledoMichiganSR 2ToledoBonoUS 20, Perrysburg Holland RoadPerrysburgHollandUS 20, Holland Sylvania RoadSoutheast of HollandSylvaniaSR 64WatervilleSwantonSR 4DaytonSpringfieldUS 25 (former)DaytonTroySR 49DaytonGreenvilleSR 48DaytonCovington (north of)SR 48DaytonLebanonSR 4DaytonGermantownSR 8 (former)AkronCantonUS 62CantonLouisville (north of)US 62, SR 193 (former)Louisville (north of)AllianceSR 172CantonMassillonUS 30, SR 172MassillonWoosterSR 800CantonNew PhiladelphiaSR 93, SR 236AkronMassillonSR 172CantonOsnaburgSR 172OsnaburgNew FranklinSR 153CantonLouisvilleSR 44RavennaLouisville (north of)SR 44Louisville (north of)LouisvilleSR 43CantonWaynesburgSR 171WaynesburgCarrolltonSR 43CarrolltonSteubenvilleSR 225AllianceEast of Atwater CenterSR 225 (former)East of Atwater CenterYaleSR 21MassillonNorthwest of StrasburgSR 183AllianceMinervaUS 62NavarreBerlinUS 422YoungstownGirardUS 422GirardWarrenUS 62YoungstownSalemSR 164, SR 7YoungstownLisbonSR 170, SR 617PennsylvaniaYoungstownUS 62, SR 173 (former)AllianceSalemUS 422YoungstownPennsylvaniaSR 14SalemUnitySR 14UnityPennsylvaniaUS 224AkronCanfieldSR 169GirardWarrenSR 165North LimaUnitySR 165UnityEast PalestineSR 174Chagrin FallsWilloughbySR 91Cuyahoga FallsSolonSR 174 (former)SolonChagrin FallsSR 59AkronCuyahoga FallsSR 59Cuyahoga FallsKentSR 261AkronKentSR 18AkronMedinaSR 585AkronWoosterUS 224BarbertonChicago JunctionSR 176 (former)Northwest of AkronGhentSR 214 (former)St. Clairsville (east of)BellaireUS 250BridgeportCadizSR 800BarnesvilleHendrysburgSR 9CadizSt. ClairsvilleSR 149New AthensMorristownSR 800BarnesvilleWoodsfieldSR 148BarnesvillePowhatan PointSR 9St. ClairsvilleArmstrongs MillsSR 265CambridgeBarnesvilleSR 145MalagaAlledoniaSR 423MarionWaldoSR 4MarionBucyrusSR 95MarionMount GileadSR 309KentonMarionUS 23, SR 199, SR 423MarionUpper SanduskySR 309MarionGalionSR 4MarysvilleMarionSR 203DelawareNorth of ProspectSR 37South of RichwoodLaRueSR 37LaRueMarseillesSR 125West UnionPortsmouth (west of)SR 41, SR 136West UnionManchesterSR 247West UnionWrightsvilleSR 247, SR 785West UnionBelfastSR 73HillsboroPortsmouth (north of)SR 41West UnionBainbridgeSR 32BataviaSouth of SeamanUS 25 (former)LimaWapakonetaSR 309LimaDelphosSR 309LimaKentonSR 65LimaOttawaSR 117LimaNorth of HuntsvilleUS 33North of HuntsvilleBellefontaineSR 66DelphosSt. MarysSR 117LimaConantSR 117ConantSpencervilleSR 12FindlayVaughnsvilleSR 12 (former)VaughnsvilleGomerUS 30GomerDelphosSR 115KiefervilleLimaSR 116, SR 117Van WertSpencervilleSR 198 (former)Delphos (south of)ConantSR 198ConantWapakonetaSR 190DelphosFort JenningsSR 190Fort JenningsWest of KalidaSR 103BlufftonCareyUS 42AshlandMedinaUS 42MansfieldAshlandUS 250AshlandWoosterSR 60/US 250AshlandSavannahUS 250SavannahFitchvilleSR 13/US 250FitchvilleNorwalkSR 60AshlandLoudonvilleSR 58AshlandSouth of SullivanSR 58South of SullivanOberlinSR 39MansfieldMillersburgUS 30, SR 430MansfieldWoosterSR 179HayesvilleNashvilleSR 96AshlandShelbySR 60SavannahVermilionSR 46NilesAshtabulaSR 307, Mells Road, Stanhope-Kelloggsville RoadJeffersonWest AndoverSR 85, US 6West AndoverPennsylvaniaSR 307JeffersonGeneva (south of)SR 86PainesvilleWindsorSR 45WindsorWarrenSR 534WindsorGenevaUS 33LoganAthensSR 144, US 50AthensHockingportSR 550AthensMariettaSR 13New LexingtonChaunceyUS 33AthensPomeroyUS 50AthensMcArthurSR 7PomeroyLittle HockingSR 377McConnelsvilleSharpsburgSR 143PomeroyWest of AlbanyUS 25 (former)SidneyWapakonetaUS 33WapakonetaSt. MarysSR 67WapakonetaKentonSR 29, SR 703St. MarysCelinaUS 33, SR 366North of HuntsvilleWapakonetaSR 29SidneySt. MarysSR 66PiquaSt. MarysSR 119IndianaMinsterSR 119MinsterNorthwest of SidneyUS 33St. MarysIndianaSR 197CelinaKossuthUS 68GeorgetownWilmingtonUS 68GeorgetownRipleyUS 62RipleyHillsboroSR 221GeorgetownHigginsportSR 4, SR 73HamiltonFranklinUS 127HamiltonEatonSR 177HamiltonIndianaUS 27IndianaMcGonigleUS 27McGonigleNortheast of RossSR 130HamiltonMcGonigleSR 122EatonMiddletownSR 63Hamilton (east of)LebanonSR 4MiddletownGermantownUS 68SpringfieldUrbanaSR 29UrbanaWest JeffersonUS 68UrbanaBellefontaineUS 36PiquaUrbanaUS 36UrbanaMarysvilleSR 29UrbanaSidneyTroy Urbana RoadTroyUrbanaSR 56Urbana (east of)LondonUS 68SpringfieldXeniaSR 41SpringfieldTroySR 41SpringfieldWashington Court HouseSR 571West MiltonDonnelsvilleSR 19BucyrusBroken SwordSR 100Broken SwordTiffinUS 30BucyrusUpper SanduskySR 19GalionBucyrusSR 309MansfieldGalionUS 30BucyrusCrestlineSR 61ShelbyGalionSR 98PlymouthBucyrusSR 61GalionMount GileadSR 181CrestlineOntario (west of)US 36GreenvilleCovingtonSR 571GreenvilleWest MiltonUS 127EatonGreenvilleUS 127CelinaGreenvilleSR 571GreenvilleUnion CitySR 49GreenvilleFort RecoverySR 121GreenvilleVersaillesSR 121GreenvilleIndianaSR 185PiquaVersaillesSR 47SidneyVersaillesSR 185VersaillesBrockUS 224FindlayTiffinSR 25FindlayBowling GreenUS 68FindlayKentonSR 199, SR 568FindlayUpper SanduskySR 15OttawaFindlaySR 18HoytvilleFostoriaSR 18Deshler (west of)HoytvilleSR 186, SR 235HoytvilleFindlay (west of)US 68BellefontaineKentonSR 53KentonForestSR 31MarysvilleKentonSR 67KentonUpper SanduskySR 235RoundheadAdaSR 81AdaForestSR 235RoundheadLakeviewSR 53ForestUpper SanduskySR 47SidneyBellefontaineUS 33MarysvilleBellefontaineSR 47BellefontaineEast of RichwoodUS 25 (former)PiquaSidneyUS 36DelawareMarysvilleSR 38MarysvilleLondonSR 37South of RichwoodDelawareUS 42DelawareLondonSR 161Plain CityDublin (west of)SR 56LondonCirclevilleSR 38Bloomingburg (south of)BloomingburgSR 38BloomingburgLondonUS 25 (former)PiquaTroyUS 36PiquaCovingtonSR 41CovingtonTroyUS 68WilmingtonXeniaUS 35EatonIndianaSR 123FranklinLebanonSR 73FranklinWilmingtonSR 123LebanonMorrowSR 123RoachesterBlanchesterSR 73WilmingtonHillsboroSR 132BataviaOwensvilleSR 132BataviaNew RichmondSR 133, SR 222BethelChiloUS 50HillsboroChillicotheUS 62HillsboroWashington Court HouseSR 138HillsboroGreenfieldSR 124HillsboroPiketonUS 127CelinaVan WertSR 49Fort RecoveryWillshireSR 29CelinaIndianaSR 118Van WertRockfordSR 53Upper SanduskyTiffinSR 67, SR 18, SR 113Upper SanduskyNortheast of BellevueUS 23FostoriaCareySR 53FremontTiffinSR 18TiffinFostoriaSR 101TiffinSouth of ClydeSR 113 (former)South of ClydeBellevueUS 224TiffinChicago JunctionSR 199PerrysburgFostoriaUS 20FremontBellevueUS 20FremontSoutheast of WoodvilleUS 20Southeast of WoodvillePerrysburgSR 101SanduskyClyde (south of)SR 53FremontPort ClintonUS 6FremontBowling GreenSR 105Bowling GreenOak HarborSR 163Oak HarborPort ClintonSR 19FremontOak HarborSR 412FremontCastaliaSR 25Bowling GreenPerrysburgSR 64Bowling GreenWatervilleSR 110 (former)Grand RapidsBowling Green (north of)SR 65OttawaMcClureSR 65McClureNorth of McClureSR 110North of McClureGrand RapidsSR 295Grand RapidsGrand Rapids (north of)US 6Bowling GreenNapoleonSR 13MansfieldFitchvilleSR 113MilanBerlinvilleSR 113BerlinvilleElyriaUS 20BellevueNorwalkUS 20, SR 511OberlinNorwalkSR 18MedinaNorwalkSR 61PlymouthNorwalkSR 162New LondonFitchvilleUS 250SanduskyNorwalkSR 147BarnesvilleBellaireSR 108WauseonNapoleonSR 2BryanWauseonSR 108WauseonMichiganSR 109McClure (west of)MichiganSR 64SwantonMichiganSR 66, US 127ArchboldMichiganSR 66ArchboldDefianceSR 107, US 20ABurlingtonMontpelier (west of)SR 2BryanHicksvilleSR 2HicksvilleIndianaSR 15BryanNeySR 15NeyDefianceSR 15BryanMichiganUS 127BryanAlvordton (east of)SR 34BryanIndianaUS 6BryanIndianaSR 34, US 6BryanNapoleonSR 49EdonMichiganSR 191StrykerEvansport (east of)US 20, SR 511OberlinElyriaSR 57MedinaElyriaSR 57ElyriaLorainUS 24NapoleonDefianceSR 109, SR 108, CR 10AOttawaNapoleonSR 18DefianceEast of HolgateSR 18East of HolgateDeshler (west of)SR 115 (former), SR 108North of HolgateKiefervilleSR 57MedinaWadsworthSR 5RavennaWarrenSR 59KentRavennaSR 44PainesvilleRavennaUS 422WarrenParkmanSR 168ParkmanBurtonSR 88RavennaParkmanUS 6ChardonHambdenSR 166, SR 528HambdenMadisonSR 46CanfieldNilesSR 82WarrenSharon, PASR 5WarrenPennsylvaniaUS 62YoungstownSharon, PAUS 42DelawareMount GileadSR 95, SR 13Mount GileadMount VernonUS 42Mount GileadMansfieldSR 61Mount GileadSunburySR 37DelawareNewark (west of)SR 13NewarkMount VernonSR 13Mount Vernon (north of)MansfieldUS 36, SR 715Mount VernonCoshoctonSR 205DanvilleJellowaySR 39MillersburgCanal DoverSR 83MillersburgWoosterSR 60Coshocton (west of)KillbuckSR 60ZanesvilleTrinwaySR 60, SR 376ZanesvilleMcConnelsvilleSR 146Newark (east of)Zanesville (north of)SR 16NewarkCoshoctonSR 146, SR 215 (former)ZanesvilleCaldwell (north of)SR 209CambridgeBloomfieldSR 83BloomfieldCoshoctonSR 93Zanesville (south of)New Lexington (east of)SR 93ZanesvilleOtsegoUS 21 (former)CambridgeNewcomerstownSR 821CambridgeCaldwellSR 37McConnelsvilleNew LexingtonSR 93LoganNew LexingtonSR 13NewarkNew LexingtonSR 37LancasterNew LexingtonSR 155ShawneeCorningSR 79, SR 37LancasterNewarkUS 33LoganLancasterSR 159Chillicothe (north of)Lancaster (south of)SR 56CirclevilleAdelphiSR 180Chillicothe (north of)Logan (west of)US 35ChillicotheJacksonUS 50ChillicotheMcArthurSR 124JacksonPiketonSR 220WaverlyZahn's CornerUS 30LisbonMinerva (east of)unbuiltMinerva (east of)Minerva (north of)US 30Minerva (east of)MinervaSR 183MinervaSandyvilleUS 250DennisonCadizSR 9CadizCarrolltonSR 151Dennison (east of)BowerstonSR 151BowerstonJewett (west of)New Rumley RoadJewett (west of)Jewett (southwest of)Old Jewett RoadJewett (west of)JewettSR 151JewettHopedaleSR 212DellroyBowerstonSR 9CarrolltonKensingtonSR 39CarrolltonCanal DoverSR 39CarrolltonSalinevilleSR 152SkelleyEmpireSR 151Mingo JunctionHopedaleSR 150Mount Pleasant (west of)RaylandSR 39SalinevilleWellsvilleSR 164LisbonSalinevilleSR 517, SR 558LisbonEast PalestineSR 165East PalestinePennsylvaniaSR 9SalemHanovertonSR 78WoodsfieldClaringtonSR 78, SR 145, SR 724CaldwellWoodsfieldSR 800WoodsfieldFlySR 145Lower SalemJerlesSR 26WoodsfieldMariettaSR 78CaldwellMcConnelsvilleSR 821CaldwellMariettaSR 147Caldwell (east of)Barnesville (west of)SR 60MariettaMcConnelsvilleSR 124, US 33PomeroyWest VirginiaSR 124PomeroyJacksonSR 93McArthurJacksonSR 93McArthurLoganSR 160GallipolisMcArthur (south of)US 35JacksonGallipolisSR 93JacksonIrontonSR 233Oak HillCadmusSR 140Oak HillPortsmouth (east of)SR 139JacksonPortsmouthSR 141Ironto