The back of your driver's license holds information you may never need — until you do
The back of your driver's license contains details that serve specific purposes in banking, law enforcement, and identity verification. Most of what appears there is a duplicate or expanded version of information on the front, but some fields exist only on the back and can affect how you're identified in transactions or traffic stops. Understanding what each field means helps you know what information you're sharing when you hand over your license.
The exact layout and fields vary by state — there is no national standard for driver's licenses. What appears on the back of a California license differs from what you'll see on a New York license. This guide covers the common fields found on most state licenses and explains what each one is used for.
Key Takeaways
- The back of your license typically repeats your address, license number, and expiration date, plus adds fields for organ donation status and emergency contact information.
- Some states print restrictions or endorsements on the back that limit how you can drive — for example, corrective lenses required or commercial driving restrictions.
- The magnetic stripe or barcode on the back encodes your license data and is read by law enforcement, banks, and age-verification systems.
- Your state's organ donation choice is printed on the back and is legally binding — it overrides what your family might want if you die.
Address, license number, and expiration date on the back
Most states print your address on the back of your license as a duplicate of the front. This serves as a quick reference for law enforcement during a traffic stop and for businesses that need to verify your current residence. If you move and update your address with the DMV, both the front and back will be reprinted with your new address when you renew or request an address change.
Your driver's license number also appears on the back on most licenses. This number is unique to you within your state and is used to look up your driving record, check for outstanding tickets, and verify your identity in financial transactions. Some states print it in a larger format on the back for easier scanning.
The expiration date on the back matches the one on the front. This date tells you when your license is no longer valid for driving or as an ID. Expired licenses cannot be used to board domestic flights, enter federal buildings, or open bank accounts, even if you are still legally allowed to drive in your state.
Restrictions and endorsements that limit how you can drive
If your license has restrictions or endorsements, they will appear on the back. A restriction is a limitation on your driving privileges — for example, "corrective lenses required" or "automatic transmission only." An endorsement is a permission to drive a certain class of vehicle, such as a motorcycle or commercial truck. Both are printed as codes (like "B" for corrective lenses) followed by a description.
Restrictions are legally binding. If your license says you must wear corrective lenses and you are stopped without them, you can be cited even if you were driving safely. Endorsements work the opposite way — if you have a motorcycle endorsement, you are permitted to ride a motorcycle; without it, you cannot legally operate one, even if you know how.
These codes vary significantly by state. A code that means "corrective lenses" in one state may mean something different in another. If you are pulled over in a state where you do not live, the officer will look up what your home state's codes mean.
Organ donation status and how it works
Most states print your organ donation choice on the back of your license, usually marked as "Donor" or "Not a Donor." This choice is legally binding and is checked by hospitals if you die. If you are marked as a donor and you die, your organs and tissues may be recovered for transplant, even if your family objects.
You can change your donor status at any time by visiting your state's DMV website or in person at a DMV office. Some states allow you to register or change your status through a national registry separate from your license. The change takes effect when ready in most states, even if your physical license still shows the old status — hospitals check the registry, not just the card.
If you are not sure what your current status is, you can check your state's donor registry online or ask at your next DMV visit. Changing your status does not require a new license to be printed; the registry is what matters.
Emergency contact information and medical alerts
Some states print a space on the back for emergency contact information — typically a name and phone number of someone to call if you are in an accident or medical emergency. This field is optional, and you can add or update it when you renew your license or visit the DMV.
A few states also print medical alert information on the back, such as "Diabetic" or "Hearing Impaired." This alerts first responders to conditions that may affect how they treat you in an emergency. You must request this information be added; it is not automatic. If you have a medical condition that first responders should know about, ask your DMV whether they offer this option.
Emergency contact and medical information are not always checked during routine traffic stops, but they are valuable if you are in an accident or unconscious. Keep your emergency contact current if you have added one.
The magnetic stripe or barcode and what it stores
The back of your license contains either a magnetic stripe (a dark band) or a 2D barcode that encodes your license information. When a police officer scans your license during a traffic stop, they are reading this stripe or barcode. Banks and age-verification systems also scan this data when you open an account or buy age-restricted items.
The encoded data includes your name, address, license number, date of birth, and expiration date — essentially everything on the front of your license. The stripe or barcode does not contain your Social Security number, medical history, or financial information, despite common myths. It is straightforward a machine-readable version of what is already printed on the card.
If the stripe or barcode is damaged or unreadable, your license is still valid for driving and as an ID, but businesses and law enforcement may have to type in your information manually instead of scanning it. A damaged stripe is not a reason to be denied service, though some retailers may ask for an alternative form of ID.
Why the back layout differs by state
Each state designs its own driver's license format, which is why the back of a license from one state looks different from another. Some states print restrictions and endorsements on the front; others put them only on the back. Some states include emergency contact fields; others do not. A few states have moved to digital-only licenses that do not have a physical back at all.
If you move to a new state, you will need to get a new license that follows that state's format. Your old license remains valid for identification purposes in most cases, but you cannot use it to drive legally in your new state after a certain grace period (usually 30 to 60 days). The DMV in your new state will issue a license with their own back-side layout and information fields.
Frequently Asked Questions
What does it mean if my license says "Not a Donor"?
It means you have chosen not to participate in organ donation. Your organs and tissues will not be recovered for transplant after your death, even if there is a medical need. You can change this status at any time by contacting your state's donor registry or visiting the DMV.
Can I add emergency contact information to the back of my license?
It depends on your state. Some states have a designated field for emergency contact on the back; others do not offer this option. Contact your state's DMV to find out whether you can add this information and how to do it.
Is the barcode on the back of my license a security risk?
The barcode encodes only the information already printed on your license — name, address, license number, date of birth. It does not contain financial data or Social Security numbers. Anyone who scans it gets the same information they would see by looking at the card.
What happens if I lose the back of my license but keep the front?
Your license is no longer valid. You will need to request a replacement from your state's DMV. A damaged or missing back makes the license unusable for driving and for most forms of identification, even if the front is intact.
Do I need to update the back of my license if I move?
Yes. Your address on the back must match your current residence. You can update your address at the DMV in person, online, or by mail depending on your state. Some states issue a new card with the updated address; others update the information in their system and send you a new card at your next renewal.