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The U.S. state of Oregon first required its residents to register their motor vehicles and display license plates in 1911.
Contents
Passenger baseplates 1911 to present
In 1956, the U.S. states and Canadian provinces came to an agreement with the Automobile Manufacturers Association that standardized 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 1955 (dated 1956) issue was the first Oregon license plate that complied with these standards.
All plates from 1956 until present are still valid, provided they are displayed on the vehicle to which they originally were issued.
Optional types
There are also special plates available for special interest vehicles, antique vehicles, veterans, and various service clubs.