After searching, I found that there are several states in the US that have yellow license plates. Here are some of them:

• Montana: The standard-issue plate is yellow with blue lettering and features an outline of the state and the words "The Treasure State".
• New Mexico: The plate is bright yellow with red lettering and features the state flower, the Yucca, in the corner. It is also the only plate to put "USA" after the state name.
• Alaska: The plate is yellow with dark blue lettering and features an image of the state flag in the center.

Its worth noting that license plates can vary depending on the type of vehicle, such as commercial or specialty plates, and some states may have multiple designs for their plates.