List of original highways in Louisiana (51–100)
Wikimedia list article

The following is a list of state highways in the U.S. state of Louisiana designated in the 51-100 range prior to the 1955 Louisiana Highway renumbering.
Louisiana State Route 51
Louisiana State Route 51 existed from 1921 to 1955.
Louisiana State Route 52
Louisiana State Route 52 ran 33.5 miles (53.9 km) 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 3.6 miles (5.8 km) 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 27.1 miles (43.6 km) 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.
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