 | ||
The U.S. state of Wisconsin first required its residents to register their motor vehicles and display license plates in 1905. Plates are currently issued by the Division of Motor Vehicles of the Wisconsin Department of Transportation (DMV).
Passenger baseplates 1905 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 1956 (dated 1957) issue was the first Wisconsin license plate that complied with these standards.
References
Vehicle registration plates of Wisconsin Wikipedia(Text) CC BY-SA