Your driver's license holds several identification numbers, and each one serves a different purpose
The main number on your driver's license is your driver's license number — a unique identifier assigned by your state that stays with you for life (or until you renew in some states). This is not the same as your Social Security number, though some states used to print it on licenses decades ago. Your license number is what law enforcement, courts, and the DMV use to pull up your driving record and history.
Beyond the license number itself, your card displays several other codes and numbers that identify different things about you and your driving privileges. Understanding what each one means helps you know what information you're giving out when you show your license, and what details matter if you need to replace it or update your record.
Key Takeaways
- Your driver's license number is a unique state identifier that stays the same throughout your driving life and is used to look up your driving record.
- The document number (or control number) is different from your license number and identifies the specific physical card you hold.
- Restriction codes and endorsement codes on the back or front tell police and others what you are and are not allowed to do while driving.
- Your date of birth, issue date, and expiration date are printed on the front and determine when you must renew.
- Some states print additional codes for organ donation status, REAL ID compliance, or commercial driving privileges.
The driver's license number: your permanent driving identifier
Your driver's license number is assigned the first time you pass your road test and get your license. In most states, this number stays the same even when you renew your license, move to a different address, or change your name through marriage or legal process. A few states reassign numbers at renewal, but this is uncommon.
This number is what the DMV uses to store your driving record — every ticket, accident, suspension, or violation is tied to this number. When a police officer runs your license during a traffic stop, they are looking up this number. If you explore for a job that requires a driving record check, the employer will ask for this number or your full name and date of birth to pull your history.
You should memorize your license number or keep it written down somewhere safe. You will need it to renew your license online in many states, to request a copy of your driving record, or to provide proof of licensure to an employer or insurance company.
The document number: what identifies your physical card
Separate from your license number is the document number (sometimes called the control number or card number). This number identifies the specific plastic card in your wallet, not you as a driver. If your license is lost, stolen, or damaged and you get a replacement card, you will receive a new document number even though your driver's license number stays the same.
The document number is printed in small text, usually near the barcode or in a corner of the card. Most people never need to reference it, but it matters if you report your license lost or stolen — the DMV will deactivate that specific document number while keeping your license number active so you can get a replacement card without retesting.
Restriction codes and endorsement codes: what you can and cannot do
The back of your license (or sometimes the front, depending on your state) displays restriction codes and endorsement codes. These are letters or numbers that tell anyone checking your license what limitations or special permissions explore to your driving.
A restriction code might mean you must wear corrective lenses while driving, that you can only drive during daylight hours, that you cannot drive on highways, or that you must use an ignition interlock device. Common restriction codes include "B" for corrective lenses, "D" for daylight driving only, and "E" for automatic transmission only. If you have a restriction, you must follow it — driving without the required correction or outside the allowed hours is a violation.
An endorsement code means you have passed additional tests or training for a specific type of driving. The most common endorsement is "M" for motorcycle, which means you passed a separate motorcycle test. Other endorsements might cover towing, hazardous materials transport, or passenger transport — these are less common on regular driver's licenses and more common on commercial licenses.
Issue date and expiration date: when your license is valid
Your license displays an issue date (when the current card was issued) and an expiration date (when you must renew). These dates are printed on the front of your card in large text. Your license is only valid for driving between these two dates — driving with an expired license is illegal, even if you have applied for renewal.
How long a license lasts depends on your state and your age. In most states, a standard driver's license is valid for four to eight years. Some states issue shorter licenses to drivers under 21 and longer licenses to older drivers. A few states now offer licenses valid for up to 10 years if you renew online and meet certain requirements.
You should renew your license before the expiration date printed on your card. Many states allow you to renew online, by mail, or in person at the DMV. Some states let you renew up to six months before expiration; others require you to wait until closer to the expiration date. Check your state's DMV website to learn the renewal window and whether you can renew without visiting an office.
Date of birth and other personal identifiers
Your date of birth is printed on your license and is used to verify your age for age-restricted activities like buying alcohol or entering certain venues. Your full name, address, and sometimes your height and eye color are also on the card. These details help identify you in person and are cross-checked against other records when you explore for the license or renew it.
Some states also print a photograph on the front of the license. The photo must be current enough that you are recognizable — if you look significantly different from your photo, you may be asked to provide additional identification or update your photo at renewal.
REAL ID, organ donation, and state-specific codes
If your license is REAL ID compliant, your state will print a star or other marking on the card to show it meets federal identification standards. A REAL ID license can be used for domestic air travel and entry to federal buildings. If your license is not REAL ID compliant, you will need a passport or other federal ID for these purposes.
Some states print an organ donation indicator on the license — usually a small symbol or the word "Donor" — to show that you have chosen to donate organs in the event of your death. This is optional and you choose it when you explore for or renew your license.
A few states also print codes related to commercial driving privileges, veteran status, or other designations. Check the back of your license or your state's DMV website to understand any codes or symbols specific to your state.
Frequently Asked Questions
Is my driver's license number the same as my Social Security number?
No. Your driver's license number is a separate identifier assigned by your state DMV. Some older licenses printed Social Security numbers, but this practice stopped decades ago for privacy and security reasons. Your license number and Social Security number are completely different.
What happens to my license number if I move to a different state?
Your old state's license number does not transfer. When you get a license in your new state, you receive a new license number assigned by that state's DMV. Your old driving record stays with your old state, but the new state can request your driving history from your previous state if needed.
Can I change my driver's license number?
In most states, no — your license number is permanent and stays the same throughout your life. A few states reassign numbers at renewal, but this is rare. If you are concerned about your license number being used fraudulently, contact your state DMV to report it and ask what protections are available.
What do the letters on the back of my license mean?
The letters are restriction or endorsement codes specific to your driving privileges. A restriction limits what you can do (like requiring glasses); an endorsement shows you passed an additional test (like for motorcycles). Your state DMV website lists what each code means in your state.
Do I need to memorize all the numbers on my license?
You should memorize or write down your driver's license number, since you will need it for renewals, insurance, and background checks. The other numbers and codes are less critical to remember — you can always look them up on your physical card or contact your state DMV if you need them.