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The U.S. state of Louisiana first required its residents to register their motor vehicles and display license plates in 1915.
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Passenger plates 1915 to present
In 1956, the U.S. states and Canadian provinces came to an agreement with the Automobile Manufacturers Association that fixed the size for license plates for vehicles, except those for motorcycles, at six inches in height by twelve inches in width, with standardized mounting holes. The 1956 (dated 1957) issue was the first Louisiana license plate that fully complied with these standards: the 1954 (dated 1955) and 1955 (dated 1956) issues were both six inches in height by twelve inches in width, but had non-standard mounting holes.
Optional types
Optional types do not use leading zeros in their serials.
State Police troop codes
From 1965 until 1993, Louisiana State Police troop area codes were used as part of the serial on the plate, invariably in the center of the serial. From 1993 until 1996, stickers were used to show the troop. This was done to give some idea of where the plates were issued. However, registrants who applied via the mail got plates with the "X" code, which was used for Baton Rouge.