Vehicle registration plates of the United States for 1912

In 1912 Mississippi, New Mexico, and Puerto Rico joined the list of states and territories providing license plates to vehicle owners, and no new states entered the prestate era. There were now 28 states and 3 territories that were issuing license plates and 9 other states requiring owners to provide their own license plates.

Passenger baseplates
In the table below, a light green background indicates that the owner of the vehicle was required to provide their own license plates. These plates are called "prestate" by most collectors. In the prestate era many states only provided the license plate number on a small disc or on paper, and the owner was required to have their license plate(s) made. These early license plates were created from kits that could be purchased at a hardware store, may have been available from automobile clubs or associations, they were forged by blacksmiths or other tradesmen, or the owner may have made their own plate with whatever materials they had on hand. Prestate plates were made from a variety of materials, but most often were made of leather, steel, or wood.