What Mexican license plates show and how they differ from U.S. plates

Mexican license plates follow a format that looks different from what you see in the United States, and the information they display is arranged in a different order. A standard Mexican plate shows a combination of letters and numbers that identify the vehicle's state of registration, the year it was registered, and a unique serial number — but the layout and what each part means requires knowing the system.

The current format, used since 2010, displays seven characters: three letters followed by four numbers. The first letter indicates the state where the vehicle is registered. The next two letters and the four numbers form a unique identifier for that specific vehicle. This is different from U.S. plates, where the arrangement and meaning vary by state and have no standardized national format.

Older Mexican plates, issued before 2010, used a different pattern: two letters, five numbers, and two more letters. If you see a plate in that format, the vehicle was registered before the current system took effect. Understanding which format you are looking at helps you know roughly when the vehicle was registered.

Key Takeaways

  • Mexican plates issued since 2010 show three letters followed by four numbers, with the first letter indicating the state of registration.
  • Plates issued before 2010 used a different format with two letters, five numbers, and two more letters at the end.
  • The state code letter is always the first character on modern plates and corresponds to a specific Mexican state or federal entity.
  • Mexican plates do not display registration expiration dates the way U.S. plates do; vehicle registration status is tracked through a separate government database.

How to identify the state from the first letter

The first letter on a Mexican plate tells you which state the vehicle is registered in. Each of Mexico's 31 states plus Mexico City has its own letter code. For example, the letter "C" represents Coahuila, "J" represents Jalisco, and "M" represents Mexico State. If you see a plate starting with "Z," that vehicle is registered in Zacatecas.

Mexico City, which is a federal entity separate from the surrounding State of Mexico, has its own code: the letter "B." This distinction matters because Mexico City and the State of Mexico are different jurisdictions with different vehicle regulations and tax requirements, even though Mexico City is geographically surrounded by the State of Mexico.

A complete state code reference is maintained by Mexico's Secretary of Communications and Transportation (Secretaría de Comunicaciones y Transportes, or SCT). If you need to know which state a specific letter represents, that agency publishes the official list. Many vehicle registration websites in Mexico also display the state codes for reference.

What the numbers and remaining letters mean

After the state letter, the next two letters and four numbers form a unique serial number for that vehicle. These characters do not encode information the way the state letter does — they are straightforward a sequential identifier assigned by the state's vehicle registration authority. Two vehicles registered in the same state will have different letter-number combinations, but there is no pattern you can read from those characters to learn about the vehicle's age, type, or owner.

The order of these characters matters for registration purposes, but not for identifying vehicle information. If you are trying to look up a vehicle's history or ownership, the plate number alone is not enough — you would need to contact the vehicle registration authority in the state shown by the first letter, and you would typically need additional documentation or legal authority to access that information.

Differences between Mexican and U.S. license plates

Mexican plates are physically larger than standard U.S. plates and are always white with black text. U.S. plates vary by state in color, size, and design. Mexican plates also do not display an expiration date or sticker the way most U.S. plates do. Instead, Mexican vehicle registration is tracked electronically, and owners receive a separate registration document (the Tarjeta de Circulación) that shows when registration expires.

Another key difference is that Mexican plates do not include a state name or abbreviation printed on them. A U.S. plate typically shows the state name or a two-letter state code somewhere on the plate itself. On a Mexican plate, you have to know the state code letter system to identify which state the vehicle is registered in — the state name does not appear on the plate.

Mexican plates also use a different character set. They use the letters A through Z (excluding the letter Ñ, which appears in Spanish but is not used on plates) and the numbers 0 through 9. This is simpler than some U.S. states, which exclude certain letters to avoid confusion with numbers (such as not using the letter O to avoid confusion with the number 0).

How vehicle registration and plate renewal work in Mexico

When a vehicle is first registered in Mexico, the owner receives a plate and a registration document called the Tarjeta de Circulación. This card shows the vehicle's details, the owner's name, the registration expiration date, and the plate number. The plate itself does not change when registration is renewed — the same plate stays on the vehicle for its lifetime, unless it is damaged or lost.

Registration renewal in Mexico happens at the state level through the vehicle registration authority in the state where the vehicle is registered. The process and timing vary by state, but owners typically must renew registration annually or every two years, depending on the state's rules. The registration document is updated, but the plate number remains the same.

If a vehicle is sold, the new owner must re-register it in their name. The plate can transfer to the new owner, or a new plate can be issued — this depends on the state's procedures. Some states allow plate transfer; others issue a new plate with a new serial number. The state code letter (the first character) will remain the same if the vehicle stays registered in that state.

Reading older Mexican plates from before 2010

Plates issued before 2010 follow a different format that can be confusing if you are used to the current system. The old format was: two letters, five numbers, and two more letters. For example, a plate might read "AB12345CD." The first two letters indicated the state, the five numbers were a serial identifier, and the final two letters were a control code.

If you encounter an older plate, the state code is still in the first two letters, but you need a different reference guide to decode it. The state codes for the old system are not the same as the single-letter codes used now. For instance, "AG" in the old system represented Aguascalientes, whereas in the new system, Aguascalientes is represented by the single letter "A."

Vehicles with old-format plates are still legal to drive in Mexico, and the plates do not need to be replaced with new ones unless the plate is damaged or the vehicle is re-registered in a different state. However, if a vehicle is transferred to a new owner or re-registered for any reason, the state may issue a new plate in the current format.

What you cannot determine from a Mexican license plate

A Mexican plate tells you the state of registration and provides a unique identifier for that vehicle, but it does not tell you the vehicle's age, type, color, or ownership. Unlike some countries that encode manufacturing year or vehicle class into the plate, Mexico does not use this system. You cannot look at a plate and know whether the vehicle is a truck, a car, or a motorcycle.

The plate also does not indicate whether the vehicle is privately owned, commercially registered, or government-owned. Some Mexican states use different plate colors or formats for commercial or government vehicles, but this is not standardized across all states, and the information is not encoded in the plate itself.

To find out detailed information about a vehicle — such as its owner, registration status, or whether it has outstanding traffic violations — you would need to contact the vehicle registration authority in the state indicated by the first letter. In most cases, this information is not public and requires legal authority or the vehicle owner's consent to access.

Frequently Asked Questions

Can I tell what year a vehicle was registered just by looking at the plate?

No. Mexican plates do not encode the registration year. The current format has been in use since 2010, so if you see a plate in the three-letter, four-number format, you know it was registered in 2010 or later, but you cannot determine the exact year from the plate alone. The registration document (Tarjeta de Circulación) shows the registration date, but the plate itself does not.

What do the colors on Mexican license plates mean?

Standard Mexican plates are white with black text. Some states use different colors for commercial vehicles, government vehicles, or temporary plates, but there is no single national standard for what each color means. The color system varies by state. If you need to know what a specific color indicates, you would need to check the regulations for the state shown by the first letter on the plate.

If a vehicle is sold, does the plate number change?

It depends on the state. Some Mexican states allow the plate to transfer to the new owner, while others issue a new plate with a new serial number when a vehicle changes ownership. The state code letter (the first character) will stay the same if the vehicle remains registered in that state. Check with the vehicle registration authority in the relevant state for their specific transfer rules.

How do I know if a Mexican vehicle is currently registered?

You cannot tell from the plate alone. The registration status is tracked in the state's vehicle registration database and is documented in the vehicle's registration card (Tarjeta de Circulación). To verify whether a vehicle is currently registered, you would need to contact the vehicle registration authority in the state indicated by the first letter on the plate, and you would typically need legal authority or the vehicle owner's permission to access that information.

Are Mexican plates the same size as U.S. plates?

No. Mexican plates are larger than standard U.S. plates. Mexican plates measure approximately 30 centimeters wide by 15 centimeters tall, while standard U.S. plates are typically 12 inches wide by 6 inches tall. This size difference is one of the most obvious visual distinctions between the two systems.