License plates began appearing in the United States at the beginning of the twentieth century. New York became the first state to require vehicle registration and visible identification in 1901, although motorists initially had to provide their own identifying marks. In 1903, Massachusetts became the first state to manufacture and issue license plates directly to drivers.
From homemade leather tags and porcelain coated metal to embossed steel, wartime fiberboard, reflective sheeting, and today's printed designs, the American license plate has changed dramatically over more than a century.
After handling and sorting authentic license plates from nearly every period of American plate production, we have found that the material and manufacturing method can often reveal a plate's era before you even look at the date.
The first license plates: 1901 to 1903
As automobiles became more common around the turn of the twentieth century, states needed a reliable way to identify vehicles and their owners.
In 1901, New York became the first US state to require automobile registration and a visible identifying mark. Owners initially had to display their initials on the rear of the vehicle in letters at least three inches high. Some painted the initials directly onto their vehicles, while others mounted characters on homemade leather, metal, or wooden plates. New York began assigning registration numbers in 1903 but did not issue state manufactured plates until 1910. Because motorists supplied their own identification, its appearance and construction varied considerably.
Massachusetts changed the system in 1903 by becoming the first state to manufacture and issue standardized license plates. Massachusetts plate number "1" was issued that year, beginning the era of government-produced plates in the United States. The Smithsonian's National Museum of American History confirms that Massachusetts was the first state to issue plates to motorists.
Other states soon followed, and government issued license plates became standard across the country during the early decades of automobile travel.
The porcelain era: 1900s to 1910s
Many early state-issued license plates were made by applying baked vitreous enamel, commonly called porcelain, to a metal base. The result was a smooth, glossy surface with sharply defined characters and rich colors.
These plates were attractive and reasonably durable, but the enamel could chip when struck. Once the underlying metal was exposed, rust could spread beneath the enamel and cause further damage. That vulnerability is one reason clean, intact porcelain plates from the early twentieth century are scarce and desirable today.
There was no national standard for plate dimensions, mounting holes, colors, or numbering systems during this period. Each state developed its own approach, resulting in an unusually wide variety of shapes, sizes, materials, and designs.
Because early vehicle-registration systems were still developing, some cities and municipalities also issued their own plates or identification tags. This adds another layer of variety, and occasional confusion, for modern collectors trying to identify early examples.
The rise of embossed-metal plates: 1920s to 1980s
By the 1920s, stamped metal plates were becoming the dominant format. Most were made from steel, although aluminum became increasingly common in later decades.
Manufacturers used large presses and dies to stamp letters, numbers, borders, state names, and dates into the metal. The raised characters could then be roll-painted in a contrasting color, allowing states to produce large numbers of readable plates efficiently.
For many collectors, the embossed metal period offers the widest combination of recognizable designs, affordable examples, and state-to-state variety. Plates from the 1930s, 1940s, and 1950s display an enormous range of color combinations, numbering formats, slogans, abbreviations, and manufacturing styles.
Even plates issued by the same state can vary from year to year. Differences in dies, metal, paint, mounting slots, county codes, weight classes, and registration types can help identify when and how a plate was made.
Many of the specialty and vintage license plates collectors seek today come from this long embossed-metal era.
Wartime license plates and material shortages: 1942 to 1945
World War II helped to disrupt the established pattern of issuing new metal license plates every year. Steel, aluminum, and other materials were needed for the war effort, forcing motor-vehicle agencies to conserve metal and find alternatives.
Some states extended the life of existing plates by issuing small metal date tabs or windshield stickers rather than manufacturing entirely new sets. Others reduced the size or number of plates issued.
A few states issued plates made from nonmetal materials, including fiberboard that was described at the time as soybean-based. Illinois and Montana are among the states that issued this type of plate. Surviving examples document a brief but fascinating attempt to keep vehicle registration systems operating during wartime shortages.
Contemporary newspaper reports claimed that dogs and turkeys chewed or ate Illinois fiberboard plates. Another report warned that hogs were attracted to similar plates. The unusual stories were attributed to the plates' soy-based composition. Wartime plates, date tabs, and unusual materials now form a distinctive part of license plate collecting because they reflect the improvisation and resource conservation of the period.
Standard license plate dimensions: the 1950s
Before the 1950s, American license plates came in many different dimensions. That created problems for automobile manufacturers, which had to accommodate plates and mounting holes that varied by state and year.
In 1956, the American Association of Motor Vehicle Administrators, working with automobile-industry and safety organizations, established standard passenger plate dimensions of 6 by 12 inches and uniform mounting hole placement. The United States and Canadian provinces quickly adopted the format, which remains the prevailing North American standard.
The Texas Department of Motor Vehicles' license-plate timeline identifies 1956 as the year AAMVA established the uniform 6-by-12-inch policy. Historical records from the California Department of Motor Vehicles also identify 1956 as the year the standardized automobile-plate size was established.
This is why most passenger plates made since the late 1950s fit modern vehicle brackets, while earlier plates may be narrower, taller, wider, or have mounting holes in different locations.
Motorcycle plates and certain specialty vehicle plates continued to use smaller dimensions.
Reflective license plates and modern graphics: 1940s to today
Reflective materials appeared on American passenger plates as early as 1941, when Georgia issued what is generally recognized as the country's first reflectorized passenger plate. Reflective plates became much more common during the 1950s and subsequent decades, improving nighttime readability when illuminated by headlights.
Over the following decades, states increasingly treated license plates as miniature billboards for state identity. Slogans, tourism messages, landmarks, wildlife, universities, military service, charities, and cultural symbols all appeared on plate designs.
Although decorative elements existed on some much earlier plates, detailed full background graphics became especially widespread during the 1980s and 1990s as manufacturing technology improved and specialty plate programs expanded.
More recently, many jurisdictions have moved away from embossed characters in favor of flat plates with printed serials and graphics. Modern plates generally use reflective aluminum sheeting with printed characters and graphics. Some also incorporate barcodes, serial markings, and holograms. Why the change to flat? They are cheaper to produce.
Want a piece of that history? Browse our authentic vintage license plates by state and era, or start a complete collection with a 50-state license plate set.
