Talk:List of state highways in Missouri

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Locations	Missouri
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Some history

Route 11, Bucklin to Kirksville
Route 19, Thayer to Hannibal (formerly Route 19 south of Cuba, Route 45 from Drake to Martinsburg, and Route 54A in Ralls County)
Route 21, De Soto to House Springs
Route 35, Clinton to Gashland
Route 39, Mt. Vernon to Pennsboro
Route 45, Parkville to East Atchison
Route 51, Fisk to Claryville (formerly Route 51A south of Dongola)
Route 55, Morley to Dutchtown
Route 73, ??
Route 75, ??
Route 77, St. Louis bypass
Route 79, Winfield to Louisiana (resulted in the deletion of Route 56)
Route 81, Kahoka to Iowa (formerly Route 4B)
Route 83, Wheatland to Harper
Route 85, Evona to Albany
Route 87, California to Prairie Home
Route 89, Linn to Chamois
Route 91, Advance to Dongola (formerly part of Route 51)
Route 93, Campbell to Arkansas
Route 95, Long Run to Wasola (formerly Route 5A)
Route 97, Wheaton to Pioneer
Route 99, St. Louis to West Alton
Route 101, Sam A. Baker Park
Route 103, Big Spring Park
Route 105, Le Prairie to Anniston
Route 107, Mark Twain Park
Route 109, ??
Route 111, Bigelow to Mound City (formerly Route 1C)
Route 113, Mound City to Skidmore (formerly Route 1D)
Route 115, ??
Route 117, Indian Trail Park
Route 119, Montauk Park
Route 121, Wallace Park?

This is the highest number I can find per year: