Your auto registration number is a unique identifier assigned to your vehicle when you register it with your state's Department of Motor Vehicles (DMV)
It is a number that appears on your vehicle registration card — the physical document you keep in your car. Some states call it a registration number; others call it a registration plate number or vehicle registration number. The exact name varies by state, but the purpose is the same: it ties your specific vehicle to your name, address, and ownership record in the state's system.
This number is different from your vehicle identification number (VIN), which is stamped into the car itself and never changes. Your registration number can change if you move to a new state, let your registration lapse, or renew it — though many states keep the same number when you renew. The registration number is what law enforcement, parking enforcement, and government agencies use to look up who owns a car and whether that car's registration is current.
Key Takeaways
- Your auto registration number appears on your vehicle registration card and is assigned by your state's DMV when you first register your car.
- This number is different from your VIN and is used by police, parking enforcement, and government agencies to identify your vehicle's owner and registration status.
- You will need your registration number when renewing your registration, reporting a stolen vehicle, or responding to a parking or traffic citation.
- If you lose your registration card, you can request a replacement from your state DMV, usually online or by mail, and the number will remain the same.
Where to find your auto registration number
Your registration number is printed on your vehicle registration card, which is the document you received from your state's DMV when you registered your car. It is usually a combination of letters and numbers, though the exact format depends on your state. Most states print it near the top or bottom of the card, sometimes labeled as "Registration Number," "Plate Number," or "Vehicle Registration Number."
If you cannot find your physical card, you can look up your registration number online through your state's DMV website. Most states allow you to log in with your driver's license number and date of birth, or your vehicle identification number (VIN). Some states also allow you to call the DMV directly and provide your name and VIN to get the number over the phone.
Why you need your registration number
You will need your registration number in several situations. If you are renewing your vehicle registration, the DMV will ask for it to pull up your existing record. If your vehicle is stolen, you will give this number to police so they can enter it into the stolen vehicle database. If you receive a parking ticket or traffic citation, the citation will reference your registration number, and you may need it to pay the fine or contest the ticket.
Insurance companies also use your registration number when you file a claim or update your policy. If you are selling your car, the buyer may ask for it to verify the vehicle's registration status before purchase. Some government programs and services — such as vehicle emission testing or toll road accounts — may ask for your registration number to look up your vehicle in the state system.
What happens if you lose your registration card
If you lose your vehicle registration card, you can request a replacement from your state's DMV. Most states allow you to do this online through their website, by mail, or in person at a DMV office. The process is usually straightforward: you provide your name, address, VIN, and driver's license number, and the DMV sends you a new card with the same registration number.
There is typically a small fee for a replacement card, usually between $5 and $20 depending on your state. The replacement usually arrives within one to two weeks if you order it online or by mail. While you wait, you can usually print a temporary registration document from your state's DMV website or request one by mail, which you can keep in your car in place of the physical card.
How registration numbers differ by state
Each state's DMV assigns registration numbers using its own system, so the format and length vary. Some states use a straightforward numeric sequence; others mix letters and numbers. Some states include a code that identifies the county where you registered the vehicle. A few states allow you to request a vanity registration number — a custom combination of letters and numbers — for an additional fee.
When you move to a new state, you will need to re-register your vehicle with that state's DMV, and you will receive a new registration number assigned by the new state. Your old registration number becomes inactive once your new state's registration takes effect. If you move back to your original state later, you will not automatically get your old number back — the DMV will assign you a new one.
Registration number versus license plate number
Your registration number and your license plate number are related but not identical. Your license plate is the metal or plastic plate attached to the front and back of your vehicle, and it displays a combination of letters and numbers. In most states, the number on your license plate is the same as your registration number, so they can be used interchangeably when identifying your vehicle.
However, in some states, the license plate displays additional information — such as a county code or a year sticker — that is not part of your official registration number. If you are unsure whether the number on your plate is your registration number, check your registration card. The card will clearly state what your registration number is, and you can compare it to what is printed on your plate.
What to do if your registration number is on a citation
If you receive a parking ticket or traffic citation that lists your registration number, that number is how the citation is linked to you and your vehicle. To pay the fine or contest the ticket, you will typically need to reference this number. Most jurisdictions allow you to pay online or by phone using the citation number, but some ask for the registration number as well.
If you believe the citation was issued in error — for example, if it was issued to the wrong vehicle — you can use your registration number to verify that the citation is actually tied to your car. Bring your registration card and the citation to the traffic court or parking enforcement office if you need to dispute it in person.
Frequently Asked Questions
Is my registration number the same as my VIN?
No. Your VIN is a 17-character code stamped into your vehicle and never changes. Your registration number is assigned by your state's DMV and can change if you move states or let your registration lapse. You can find your VIN on your registration card, driver's side door jamb, or under the windshield on the dashboard.
Can I look up someone else's registration number?
In most states, vehicle registration information is public record, but access varies. Some states allow you to search online using a license plate number; others require you to visit a DMV office in person. A few states restrict access to law enforcement and government agencies only. Check your state's DMV website to see what information is publicly searchable.
What if my registration number is wrong on my card?
Contact your state's DMV when ready. Errors on registration cards are rare but do happen. Bring your card and a photo ID to a DMV office, or call the DMV to report the error. They will investigate and issue a corrected card if needed. Do not use a card with an incorrect number for official purposes.
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 card in your vehicle at all times — it is required by law in most states. If you need the number while away from your car, you can look it up on your state's DMV website or call the DMV with your VIN.