List of original highways in Louisiana (51–100)

Louisiana State Route 51 existed from 1921 to 1955. ==Louisiana State Route 52==

Louisiana State Route 52 ran in a general east–west direction from US 171/US 190/State Route 42 southeast of DeRidder, Beauregard Parish to the junction of US 165/State Route 24 and State Route 25 in Oberlin, Allen Parish. ==Louisiana State Route 53==

Louisiana State Route 53 ran in a north–south direction from State Route 1 in LaPlace to the junction of State Route 33 and State Route 1141 in Frenier, St. John the Baptist Parish. Most of the route was concurrent with US 51. ==Louisiana State Route 54==

Louisiana State Route 54 existed from 1921 to 1955. ==Louisiana State Route 55==

Louisiana State Route 55 ran in a north–south direction from the junction of US 79/US 80/State Route 4 in Shreveport, Caddo Parish to the Arkansas state line north of Ida. The route was entirely concurrent with US 71. The above mileage reflects a gap in the route between Dixie and Gilliam, as that portion of the highway was being relocated at the time of the 1955 Louisiana Highway renumbering. ==Louisiana State Route 56==

Louisiana State Route 56 ran in a general east–west direction from US 90/State Route 2 in New Iberia to a dead end at Lake Dauterive in Iberia Parish. Much of the route became a portion of LA 86 in the 1955 renumbering; the section from Loreauville to Lake Dauterive became LA 3242. ==Louisiana State Route 57==

Louisiana State Route 57 ran in a general north–south direction, existing as two disconnected sections. The southern portion extended from State Route 5 north of Marksville, Avoyelles Parish to State Route 123 northeast of Holloway, Rapides Parish. The northern portion extended from a dead end at the Little River to the junction of US 84, State Route 6, and State Route 19 in Jena, LaSalle Parish. SR 57 became a portion of LA 107 in the 1955 renumbering. ==Louisiana State Route 57-D==

Louisiana State Route 57-D ran in a general east–west direction, branching off of State Route 57 north of Effie, Avoyelles Parish and extending to US 165/State Route 14 in Pineville, Rapides Parish. SR 57-D became a portion of LA 107 in the 1955 renumbering. ==Louisiana State Route 58==

Louisiana State Route 58 existed from 1921 to 1955. ==Louisiana State Route 59==

Louisiana State Route 59 existed from 1921 to 1955. ==Louisiana State Route 60==

Louisiana State Route 60 ran in a north–south direction from a dead end at East Cote Blanche Bay to US 90/State Route 2 in Centerville, St. Mary Parish. SR 60 was renumbered as LA 317 in the 1955 renumbering. ==Louisiana State Route 61==

Louisiana State Route 61 ran in a north–south direction from State Route 1 in Chalmette, St. Bernard Parish to US 90/State Route 2 in New Orleans, Orleans Parish. SR 61 was renumbered to LA 47 in the 1955 renumbering. ==Louisiana State Route 62==

Louisiana State Route 62 ran in a north–south direction from a dead end in Delacroix to State Route 32 west of Yscloskey, St. Bernard Parish. ==Louisiana State Route 63==

Louisiana State Route 63 ran in a general north–south direction from State Route 1 in Geismar, Ascension Parish to a second junction with State Route 1 in Baton Rouge, East Baton Rouge Parish. SR 63 was renumbered to LA 30 in the 1955 renumbering. ==Louisiana State Route 64==

Louisiana State Route 64 ran in a north–south direction from State Route 17 northeast of Columbia, Caldwell Parish to State Route 47 south of Rayville, Richland Parish. ==Louisiana State Route 65==

Louisiana State Route 65 existed from 1921 to 1955. ==Louisiana State Route 66==

Louisiana State Route 66 existed from 1921 to 1955. ==Louisiana State Route 67==

Louisiana State Route 67 ran in a general east–west direction in two disconnected segments. The western portion extended from State Route 15 at Foules, Catahoula Parish to a dead end at the Tensas River. The route resumed on the opposite bank of the river in Tensas Parish, extending to US 65/State Route 3 in Waterproof. ==Louisiana State Route 68==

Louisiana State Route 68 ran in a north–south direction from State Route 18 in Harrisonburg to the junction of US 165/State Route 14 and State Route 110 in Grayson. ==Louisiana State Route 69==

Louisiana State Route 69 existed from 1921 to 1955. ==Louisiana State Route 70==