Your registration number is the unique identifier your state assigns to your vehicle
Your car's registration number — also called a license plate number or registration plate — is a combination of letters and numbers displayed on metal plates attached to the front and back of your vehicle. This number is tied to your vehicle's ownership record with your state's Department of Motor Vehicles (DMV) or equivalent agency. Every registered car has one, and no two active registrations in the same state share the same number.
The registration number is different from your Vehicle Identification Number (VIN), which is a 17-character code stamped into the car's frame and used to track the vehicle's history. The registration number changes if you move to a different state or renew your registration, but your VIN stays the same for the life of the vehicle.
Key Takeaways
- Your registration number appears on the metal license plates on your car's front and back, and also on your registration certificate (the paper document you receive from your state).
- Each state has its own format for registration numbers — some use all letters, some use numbers and letters mixed, and some include county codes or special designations.
- You need your registration number to renew your registration, report a stolen plate, transfer ownership, or provide proof of registration to law enforcement.
- If your plates are damaged, lost, or stolen, you can request replacement plates from your DMV, and you will receive new registration numbers.
Where to find your registration number on your vehicle
The easiest place to find your registration number is on the metal license plates bolted to your car. Look at the front plate and the rear plate — they display the same registration number. The number is usually centered on the plate and printed in large, straightforward-to-read characters.
If your plates are missing or unreadable, you can find your registration number on your registration certificate, the paper document your state mailed to you when you registered the vehicle. This certificate lists your name, the vehicle details, and the registration number. Keep this document in your car or at home where you can find it quickly.
How registration numbers are formatted by state
Each state designs its own registration number format, so there is no single standard across the country. Some states use a pattern like three letters followed by three numbers (ABC 123). Others use numbers first, then letters. Some states include a county code as part of the number, while others add a special prefix or suffix to indicate vehicle type, such as commercial or government use.
Vanity plates — custom registration numbers you request instead of accepting a random assignment — follow the same format rules as standard plates but let you choose the letters and numbers (within limits set by your state). Vanity plates cost extra and require a separate request through your DMV.
Why you need to know your registration number
You will need your registration number in several situations. If you are pulled over by law enforcement, they will ask for your registration certificate, which displays the number. If you need to renew your registration, your state will use the registration number to look up your vehicle record. If you report your car stolen or your plates lost or damaged, you will give the registration number to police or your DMV.
Insurance companies also use your registration number to link your policy to your vehicle. When you get a quote or file a claim, having your registration number on hand speeds up the process. Some states also require you to display your registration number on your vehicle at all times, and driving without visible plates or with obscured plates can result in a traffic citation.
What to do if your plates are damaged, lost, or stolen
If your license plates are damaged, faded, or bent, you can request replacement plates from your DMV. The process usually involves filling out a form (often available online or at your local DMV office) and paying a replacement fee, which varies by state. When you receive new plates, they will have a new registration number assigned to them.
If your plates are stolen, report the theft to your local police department and get a report number. Then contact your DMV with the police report number and request replacement plates. Some states allow you to report a stolen plate online, while others require you to visit in person or mail in a form. Until you receive your new plates, you may be issued a temporary registration number or temporary plate to display on your vehicle.
The difference between registration number and VIN
Your registration number and your Vehicle Identification Number (VIN) serve different purposes. The registration number is what your state assigns when you register the vehicle — it changes if you move states or if your plates are replaced. Your VIN is a permanent identifier built into the vehicle itself and never changes, no matter where you live or how many times you register it.
The VIN is used to track the vehicle's history, including accidents, repairs, title transfers, and recalls. Insurance companies and mechanics use the VIN to pull up detailed information about the car. The registration number is used by your state to manage registration records, track vehicle taxes, and enforce traffic laws. Both numbers are important, but they track different information about your vehicle.
Frequently Asked Questions
Can I choose my own registration number?
You can request a vanity plate with a custom registration number through your DMV, but you cannot choose any combination you want. Your state has rules about what letters and numbers are allowed, and you cannot use offensive language or impersonate government plates. Vanity plates cost extra and must be renewed along with your regular registration.
What if I move to a different state?
When you move to a new state and register your vehicle there, you will receive a new registration number with your new state's format. You will need to surrender your old plates and display the new ones. Your VIN stays the same, but your registration number changes because it is tied to your state of residence.
Do I need to memorize my registration number?
You do not need to memorize it, but it is helpful to know where to find it quickly. Keep your registration certificate in your car or take a photo of your license plate with your phone. If you are ever in a situation where you need the number and cannot access your plates or certificate, you can contact your DMV with your name and address to look it up.
What happens if my registration number is obscured or unreadable?
If your license plate is covered by dirt, damage, or anything else that makes the registration number hard to read, you can receive a traffic citation. Keep your plates clean and visible at all times. If the plate is damaged beyond readability, contact your DMV to request a replacement.