In 1903, Massachusetts became the first state to issue official porcelain license plates. The very first was issued to Frederick Tudor and bore the number “1.” As the license numbers grew, Massachusetts plates became wider to accommodate the extra digits. Unlike later Massachusetts plates, these were undated.

Philadelphia produced the first dated porcelain license plate later that same year. By 1909, porcelain plates had spread throughout the Northeast and were slowly moving south and west, with 12 states and 20 cities and counties issuing official porcelain plates. In 1910, Michigan introduced the first non-passenger porcelain plates; these plates were for motorcycles and motorcycle manufacturers. By 1916, however, all but six states issuing porcelain plates had switched to embossed metal. New Mexico was the last holdout, producing porcelain plates until 1923.

As metal plates took hold, license plates began changing gradually. In 1928, Idaho became the first state to issue a license plate with a graphic (the potato). Pennsylvania made the first custom or vanity plates in 1931.

During World War II, the number of plates printed dropped dramatically in most states, as the metal was needed for the war effort. Some states even collected plates and melted them down, which has thinned the numbers of surviving plates from the period.

In 1948, Connecticut introduced reflective license plates using a technique popularized in Mexico more than 10 years earlier—the embossed numbers were coated with ink containing reflective beads. This gave the license plates improved visibility, especially at night. In the 1960s and ’70s, most states switched to a reflective sheeting invented by 3M.

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