Mexican license plates follow a standardized format that tells you the vehicle's registration state, issue year, and a unique identifier

A Mexican license plate contains six characters: three letters followed by three numbers. The first letter identifies the state where the vehicle is registered — for example, plates starting with "B" come from Baja California, "C" from Coahuila, and "M" from Mexico City. The remaining two letters and three numbers are unique to that specific vehicle. Unlike U.S. plates, Mexican plates do not display the registration year on the plate itself; the year is recorded in the vehicle's registration document (the tarjeta de circulación) instead.

Mexico replaced its older alphanumeric system with this current format in 2007. The change was designed to reduce fraud and make vehicle identification more consistent across the country. If you see an older plate with a different pattern — sometimes with just numbers or a different letter arrangement — that vehicle was registered before the transition.

Key Takeaways

  • Mexican plates use three letters (identifying the state) followed by three numbers (the vehicle's unique identifier).
  • The first letter shows which state issued the registration; you can look up the state code to know where a vehicle is registered.
  • The registration year is not printed on the plate but is recorded in the tarjeta de circulación, the official vehicle registration document.
  • Plates issued before 2007 follow older formats and may look different from current plates.
  • Temporary plates, used for new or recently purchased vehicles, follow a different format and are valid for a limited time only.

State codes and what the first letter tells you

The first letter on a Mexican plate corresponds to a specific state. This system makes it straightforward to identify where a vehicle is registered at a glance. For example, "A" represents Aguascalientes, "D" represents Durango, and "J" represents Jalisco. Mexico City, which was historically called the Federal District, uses "M" for its plates.

If you need to know which state a plate belongs to, you can cross-reference the first letter against a state code chart. This information is useful if you are trying to understand where a vehicle is from or if you need to contact the appropriate state motor vehicle authority. The state code does not change unless the vehicle is re-registered in a different state, which requires updating the registration and obtaining a new plate.

How the three numbers work and what they mean

The three numbers on a Mexican plate are a sequential identifier assigned to that vehicle within its state. They do not encode information about the vehicle type, owner, or registration date the way some other countries' systems do. Instead, they are straightforward a unique number in the sequence of registrations for that state.

Because Mexico issues millions of vehicles across 32 states, the numbering system recycles. This means two vehicles in different states could theoretically have the same three-digit number — but the state letter makes each plate unique. The numbers range from 000 to 999, so each state can issue up to 1,000 combinations for each two-letter prefix before the letter sequence advances.

Temporary plates and what they look like

When someone buys a new vehicle or imports one into Mexico, they receive a temporary plate while waiting for the permanent registration to be processed. Temporary plates are printed on paper or plastic and typically display a different format than permanent plates — often with a red or blue background and text indicating they are temporary (placa temporal).

Temporary plates are valid for a set period, usually 30 days, though this can vary by state. Once the permanent registration is complete, the owner receives a metal plate with the standard format. Driving on an expired temporary plate is illegal, so owners must complete their registration before the temporary plate expires.

Differences between Mexican plates and U.S. plates

Mexican plates do not display the registration year, whereas most U.S. state plates include a year sticker or year designation. In Mexico, the year is recorded only in the vehicle's registration document, not on the plate itself. This means you cannot tell how old a registration is just by looking at the plate.

Mexican plates also do not include a state name or slogan the way U.S. plates do. The plate is straightforward the letter-number combination and the state code. Additionally, Mexican plates are typically smaller and have a different shape than U.S. plates. If you are crossing the border or dealing with a vehicle that has been in both countries, these differences can help you identify which registration system applies.

How to look up vehicle information using a Mexican plate

In Mexico, the public cannot easily look up vehicle ownership or registration details using only the plate number. Unlike some countries, Mexico does not maintain a searchable public database of plate numbers. Vehicle information is held by the state motor vehicle authority and is generally available only to law enforcement, government agencies, and the registered owner.

If you need to verify information about a vehicle — for example, if you are buying a used car — you should request the tarjeta de circulación from the seller and verify it matches the plate. The tarjeta contains the owner's name, vehicle identification number (VIN), registration date, and other details. You can also contact the state motor vehicle office directly if you have a legitimate reason to verify registration status.

What happens when a vehicle changes ownership or moves to a new state

When a vehicle is sold in Mexico, the new owner must register it with the state motor vehicle authority. The registration can be transferred to the new owner, but if the new owner lives in a different state, they may need to re-register the vehicle in their home state and receive a new plate with the appropriate state code.

Re-registration requirements vary by state. Some states allow owners to keep their original plate if they move, while others require a new plate. The tarjeta de circulación is updated to reflect the new owner's information, and any change in state registration will result in a new plate being issued. This process typically takes a few weeks and requires documents such as proof of purchase, identification, and proof of address.

Frequently Asked Questions

Can I tell how old a vehicle is by looking at its Mexican license plate?

No. Mexican plates do not display the registration year. The year is recorded only in the tarjeta de circulación, the vehicle's registration document. You must ask the owner or check the registration document to find out when the vehicle was registered.

What do the letters on a Mexican plate mean?

The first letter identifies the state where the vehicle is registered. The next two letters are part of the unique identifier for that vehicle. Together with the three numbers, they form a plate that is unique within Mexico's registration system.

Are Mexican temporary plates legal to drive on?

Yes, temporary plates are legal during their validity period, which is usually 30 days. Once the temporary plate expires, you must have a permanent plate. Driving on an expired temporary plate is illegal and can result in a fine.

What should I check when buying a used car in Mexico?

Ask the seller for the tarjeta de circulación and verify that the name on the document matches the seller's identification. Check that the plate number on the document matches the physical plate on the vehicle. Confirm the vehicle identification number (VIN) on the document matches the VIN on the vehicle itself.

Do I need to get a new plate if I move to a different Mexican state?

It depends on the state. Some states allow you to keep your original plate, while others require re-registration and a new plate with the new state code. Contact the motor vehicle authority in your new state to find out their specific requirements.