The document number on your ID, often called the document discriminator and labeled DD or Doc # on the card, is a unique code that identifies your specific physical license or state ID rather than you as a person. It’s a string of roughly 8 to 14 letters and numbers, printed somewhere on the front or back of the card, and it changes every time your state prints you a new card. That’s different from your license number, which stays with you across renewals.
Most people never think about this code until a job application, an E-Verify check, or a government portal asks for it by name. At that point the distinction between the two numbers on your card suddenly matters.
How It Differs From Your License Number
Your driver’s license number (sometimes called a client ID or ID number) is assigned to you personally. It tracks your driving record and stays constant through renewals, replacements, and address changes. It’s the number most people mean when they say “your license number.”
The document discriminator is tied to the card itself. It’s generated based on factors like when and where that particular card was issued, so it’s fresh on every new card the state prints. Renew your license, request a duplicate after losing your wallet, or update your address on a new card, and a new document number comes with it. The old one becomes invalid.
That’s the design. Anyone checking whether you’re holding the current version of your ID can compare the document number against state records. If it doesn’t match, the card is outdated or potentially fraudulent. This is also why people trip over the term constantly: a form asks for the “document number,” you type your license number by reflex, and the process stalls. They’re separate fields with separate purposes.
Where to Find It on the Card
Every state designs its own layout, so there’s no single spot to point to. A few patterns hold across most modern cards.
- Look for the label DD or Doc #. If you spot either, the alphanumeric string next to it is your document number.
- Check the back first. On newer cards, the document discriminator is frequently printed on the back, often near or above the large rectangular PDF417 barcode. Some states print it on both sides.
- Expect a mix of letters and numbers. The document number is typically 8 to 14 alphanumeric characters.1E-Verify. Tips for Entering Driver’s Licenses and ID Cards in E-Verify
- It’s usually in smaller print than your name and license number, which is part of why it’s easy to overlook.
If your card predates a state redesign, the placement may not match what current guides describe. States overhaul their layouts periodically to meet updated security standards, and older cards in circulation carry the document number in different spots than newer ones. When in doubt, look for any alphanumeric string on the card that isn’t your license number, date of birth, or address.
The document discriminator is also encoded inside the PDF417 barcode on the back, which is how most verification systems read it electronically during a scan. You don’t need to interact with the barcode yourself unless a scan isn’t reading correctly.
When You’ll Need It
Most people go years without using this number. A few specific situations bring it up.
- E-Verify employment checks. When your employer runs your information through E-Verify, participating states require the document number from your driver’s license or state ID entered alongside your license number. E-Verify accepts 8 to 14 alphanumeric characters with no special characters.1E-Verify. Tips for Entering Driver’s Licenses and ID Cards in E-Verify
- Online government portals. Some state DMV websites and other government services ask for the document number when you log in or verify your identity, using it as proof that you have the physical card in hand rather than just your license number memorized.
- Background checks and financial applications. Certain landlords, lenders, and screening services request it as an extra verification layer.
One point worth pinning down, because it causes real problems during onboarding: Form I-9 and E-Verify treat “document number” differently. When your employer fills out Section 2 of Form I-9 and you present a driver’s license as a List B identity document, the “Document Number” field on that form typically refers to your license number. When the same employer runs your information through E-Verify’s RIDE program (Records and Information from DMVs for E-Verify), the system may separately ask for the document discriminator. Confusing the two is one of the most common errors during a new hire’s first week.
A New Card Means a New Document Number
Every time your state issues a new physical card, whether for a renewal, a replacement after loss or theft, or an updated photo, the document discriminator on that card will differ from the old one. Your license number stays the same. The document number resets because it belongs to the piece of plastic, not to you.
Any system that verified your old document number will need the updated one. If an employer or verification service is still working with your old number after you got a replacement, the check will fail. This matters most during job transitions or if you lose your wallet in the middle of an application process.
Until the new card arrives, most states issue a temporary paper document that serves as valid ID. That temporary usually won’t have a document discriminator on it, which can complicate any verification process that specifically needs one. If you’re mid-onboarding, tell your employer where you are in the replacement process so they can work with the temporary document and update the record when the permanent card shows up.
What Happens If the Wrong Number Gets Entered
Entering the wrong document number during an E-Verify check can trigger a Tentative Nonconfirmation, also called a mismatch. This doesn’t mean you’re in trouble, but it does start a clock. Within 10 federal government working days after E-Verify flags the mismatch, your employer must notify you privately, and you have to decide whether to contest it.2E-Verify. Tentative Nonconfirmation (Mismatch) Overview
If you contest, you’ll contact DHS or visit a Social Security Administration office to resolve the discrepancy. Common causes include typos during data entry, outdated records in government databases, or an employer entering your old document number from a previous card. If you don’t respond by the 10th working day, your employer can close the case in E-Verify, which may lead to termination.
Your employer cannot fire you or take adverse action just because of a mismatch. The law prohibits assuming a mismatch means you’re unauthorized to work, and employers who terminate on that basis risk discrimination complaints and fines.2E-Verify. Tentative Nonconfirmation (Mismatch) Overview The process exists specifically to give you time to fix a fixable problem.
Immigration Documents Use the Term Differently
If you’re filling out paperwork for a federal immigration document rather than a state driver’s license, “document number” points to something else entirely. On a Permanent Resident Card (Form I-551), the primary identifier is the USCIS number, also called the A-Number or Alien Registration Number, which appears on the front of cards issued since May 2010 and is also printed on the back.3U.S. Citizenship and Immigration Services. 13.1 List A Documents That Establish Identity and Employment Authorization An Employment Authorization Document (Form I-766) has a separate card number printed on both sides, formatted as three letters followed by 10 digits, and that’s the number entered for I-9 and E-Verify purposes.
These federal documents work as List A documents on Form I-9, establishing both identity and work authorization at once. A driver’s license, by contrast, is only a List B identity document and has to be paired with a List C document to complete the I-9.