In 1926 and 1927, Missouri implemented a major renumbering of its state highways because of the implementation of the US Highway System. Routes 2, 3, 7, 8, 9, 11, 12, 14, and 23 were entirely replaced by U.S. Routes. Routes 36, 40, 50, 60, 61, 62, 63, 65, 67, and 69 conflicted with new designations (note that Route 71, another conflicting number, had already been replaced by Route 3 by then because the portion of Route 3 here was not built), so the routes with these numbers had been renumbered. Note that a route number wasn't decided for renumbering State Route 65 (which was just removed from the state highway system temporarily) until 1927. OldNewFromToArkansasSt. JosephSt. JosephIowaKansasJoplinKansas CitySt. LouisArkansasIowaSt. JosephWaylandWaylandIowaArkansasIowaSt. JosephHannibalArkansasWaylandKahoka (Route 9 overlapped Route 4 from Wayland)IowaExcelsior Springs (US 69 overlapped Route 10 from Kansas City)IowaKansas CityEast of Union (US 50 overlapped US 60 to St. Louis)BuffaloBolivarBolivarGallatinCarthage (US 60 overlapped US 71 from Joplin)St. LouisOklahomaSpringfieldSpringfieldIllinoisN/A?MaryvilleIowaArkansasFredericktownSavannah (US 71 overlapped Route 1 from St. Joseph)MaryvilleMaryvilleIowaNashuaWest of PlattsburgWest of PlattsburgWest of CameronKansasSpringfieldBillingsRooseveltWest of PlattsburgSt. JosephWest of LeetonWindsorTarkioIowaSteelvillePotosiHarrisonvilleEast of Lee's SummitN/ASt. JamesVichyEl Dorado SpringsFair Play (overlapped Route 13 to Bolivar after 1926)RocheportFayetteSpringfieldBolivar (Route 13 overlapped Route 66 to Fair Play)
In 1927, additional renumberings took place, as what was planned as US 62 became US 60, what was planned as US 60 became US 66, and US 24 and US 54, which were not originally planned to enter the state, were added; State Routes 24 and 54 were renumbered, State Route 66 (another conflictive number) was replaced by US 54, and Route 68 was used for renumbering the road that was Route 65 before 1926. OldNewFromToKansasIllinoisSpringfieldKentuckySt. JosephWaylandKansas CityCarrolltonCarrollton (US 24 overlapped US 65 from Waverly)Monroe CityBuffaloMexicoMexicoIowaKansasWaverly (Route 20 overlapped US 65 to Marshall)MarshallHuntsvilleClarkMexicoMexicoIllinoisKansasTuscumbiaKansasEldorado SpringsEldorado SpringsOsceolaLickingFlat River (32 overlaps US 61 to Farmington)KansasSt. JosephParisNew LondonEldorado SpringsBuffaloFarmington (32 overlaps US 61 to Flat River)Sainte GenevieveN/A (this was 65 before 1926)St. JamesVichyN/A (new construction)West of Hannibal (US 24 overlapped US 36 from Monroe City)PalmyraN/A?Taylor (US 24 overlapped US 61 from Palmyra)Illinois
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