What Is a Credential Number on a Driver's License?

If you've ever filled out a form asking for your credential number and stared at your license wondering which number that means, you're not alone. The term shows up on government forms, online DMV portals, background check requests, and identity verification screens — and it's rarely explained on the form itself.

Here's what it means and how it works.

What a Credential Number Actually Is

A credential number is a unique identifier assigned to a specific identity document — in this case, a driver's license or state ID card. When the term appears on a form, it typically refers to the document number printed on your physical license, not your driver's license number (though these are sometimes the same thing, depending on your state).

The word "credential" is a broader term used in identity and licensing systems to mean any officially issued document that verifies who you are or what you're authorized to do. Your driver's license is a credential. So is a passport, a CDL, or a state-issued ID card.

When a form asks for your credential number, it's asking: which specific issued document are you presenting, and what is its unique identifying number?

Driver's License Number vs. Document Number 🪪

This is where confusion commonly begins. Many states print two separate numbers on a driver's license:

• Driver's license number — This is tied to you as a licensed driver. It typically stays the same across renewals and is linked to your driving record.
• Document number (sometimes called the credential number, DD number, or audit number) — This is tied to the specific card that was issued. It changes every time a new card is printed, even if your license number doesn't change.

The document number is often located in a less obvious place on the card — sometimes on the back, sometimes near the bottom of the front, sometimes labeled "DD" (Document Discriminator). Its format varies by state: it may be alphanumeric, longer than your license number, or formatted differently depending on when and where your card was printed.

Where the Term "Credential Number" Comes From

The term is used most often in contexts where systems need to track which version of a document was presented — not just who you are, but which specific card was used for a transaction.

You'll encounter it most in:

• REAL ID verification systems — The REAL ID Act established federal standards for state-issued credentials, and federal systems often use "credential number" language when referencing compliant IDs.
• Online DMV portals — When renewing your license online, some state systems ask for your credential number to verify that the card you're referencing matches their records.
• Background check and identity verification forms — Employers, landlords, and agencies sometimes ask for a credential number to confirm the document is valid and current.
• AAMVA-linked systems — The American Association of Motor Vehicle Administrators (AAMVA) coordinates data standards across state DMVs, and "credential" is standard terminology within that framework.

How States Handle This Differently

No two states format or label this information identically. In some states, the document number is clearly labeled. In others, you may need to look for a long string of characters near the barcode or magnetic strip on the back of the card.

Some states use the same number for both the driver record and the physical document. Others separate them entirely. A few states include the document number only in the machine-readable zone (the PDF417 barcode on the back), which means it may not be visible on the face of the card at all.

If a form asks for your credential number and your license doesn't display an obvious label for it, the document number — wherever it appears on your card — is almost always what's being requested.

When You Might Be Asked for It ✅

The most common situations where a credential number is specifically requested:

• Online license renewal — Your state DMV may require it to pull up your record and confirm card validity before allowing a remote renewal.
• First-time REAL ID applications — Federal-compliant ID issuance involves verification steps that may reference credential data.
• Out-of-state license transfers — When surrendering a license from another state, the receiving state may log the credential number of the document you're handing over.
• Employment or security clearance paperwork — Forms that require you to list identity documents often include a field for the document's identifying number.
• Court or legal proceedings — Traffic citations, legal filings, and some reinstatement paperwork may ask for the credential number of the license in question.

What It Doesn't Tell You

A credential number identifies a document. It does not reflect your driving record, point history, license class, or endorsements. If a form asks for both your license number and your credential number, those are two distinct fields asking for two distinct pieces of information — and the difference matters.

What that number looks like on your card, where it's located, and whether your state separates it from your license number depends entirely on the state that issued your credential and when your current card was printed.