Are some license plates made from nonmetal materials?

The short answer is “Yes!”.  According to Colorado License Plates, the First 100 Years, ” Wood, rubber, pressed soybean meal, cardboard, and plastic were used in lieu of metal or when metal supplies were limited, as was the case during Worl War II. In past years, new plates would be issued annually, but now virtually all plates are renewed for multiple years. Windshield stickers, metal tabs or stickers attached to the plates themselves were employed for the renewal of plate registrations. ” These days most license plates are made from aluminum and a few states have plates made with a mixture of steel and aluminum.