The audit number is a unique identifier printed on your driver's license that helps state DMV offices track and verify license records
Every driver's license issued in the United States carries an audit number — a code that appears somewhere on the physical card, though its exact location and format varies by state. This number serves as an internal reference tool for the Department of Motor Vehicles (DMV) in your state. It is not the same as your driver's license number, and it is not meant for public use or identification outside the DMV system.
The audit number allows DMV staff to pull up your complete license record, verify the authenticity of your card, and track any changes or renewals to your license history. When you renew your license, get a replacement card, or update your address, the DMV uses this number to connect the new card to your existing file. It also helps prevent duplicate licenses and fraud.
Key Takeaways
- The audit number is printed on your physical driver's license and serves as an internal DMV reference code, not a public identifier.
- Each state places and formats the audit number differently — there is no national standard for where it appears or what it looks like.
- You do not need to memorize or use your audit number for everyday driving or identification purposes.
- The audit number helps the DMV verify your license is genuine and track your record across renewals and address changes.
- If you need to reference your license for a government or financial institution, use your driver's license number instead.
Where the audit number appears on your license
The location of the audit number on your card depends entirely on which state issued your license. Some states print it on the back of the card, others on the front, and a few embed it in a barcode or magnetic stripe that is not visible to the naked eye. A few states do not use a separate audit number at all and instead rely on the license number itself for tracking purposes.
If you want to find your audit number, check the back of your license first — this is the most common location. Look for a small code or number that is separate from your main license number, date of birth, or address. Your state's DMV website usually includes a diagram showing where each piece of information appears on the current license design. If you cannot locate it or are unsure whether your state uses one, contact your state DMV directly.
Why states use audit numbers instead of just the license number
The audit number exists because driver's license numbers follow predictable patterns based on your name, birth date, or other personal information. This makes them easier to forge or guess. An audit number, by contrast, is assigned randomly by the DMV system and has no connection to your personal data. It is harder to counterfeit and provides an additional layer of verification when DMV staff need to confirm a license is real.
The audit number also helps the DMV manage its own internal operations. When you renew your license, the system uses the audit number to link your new card to your old record without creating a duplicate file. If you report your license lost or stolen, the audit number helps the DMV flag the old card in their system so it cannot be used fraudulently. It is a tool for the DMV's benefit as much as for security.
When you might need to reference your audit number
In most everyday situations, you will never need to use or provide your audit number. Banks, employers, schools, and other institutions ask for your driver's license number when they need to verify your identity — not your audit number. Police officers checking your license during a traffic stop do not ask for the audit number.
The only time you are likely to encounter your audit number is if you are working directly with your state DMV — for example, if you are replacing a lost license, disputing a record, or requesting a copy of your driving history. DMV staff may reference it in their system to pull up your file quickly. If a DMV employee asks you for it, they will tell you where to find it on your card.
How audit numbers differ across states
Because there is no federal standard for driver's licenses, each state designs its own format and decides where to place the audit number. Some states use a straightforward numeric code, others use a combination of letters and numbers. The length varies — some audit numbers are four digits, others are eight or longer.
A few states have redesigned their licenses in recent years and changed where the audit number appears or how it is formatted. If you have an older license and are curious about the audit number, the format on your card may not match the current design. When you renew, your new license will follow the current state standard.
Protecting your license and audit number
While the audit number is not as sensitive as your Social Security number, it is still part of your official identity document and should be treated with reasonable care. Do not photograph your license and share it on social media, and do not provide your license number or audit number to unknown callers or websites.
If your license is lost or stolen, report it to your state DMV as soon as possible. The DMV will flag your audit number in their system, which prevents someone else from using your card. You can then request a replacement card with a new audit number assigned to it.
Frequently Asked Questions
Is the audit number the same as my driver's license number?
No. Your driver's license number is the main identifier on your card and is what you provide to police, employers, and other organizations. The audit number is a separate code used only by the DMV for internal record-keeping and verification.
Do all states use audit numbers?
Most states do, but the format and location vary widely. A few states do not use a separate audit number and instead use the license number itself for tracking. Check your state DMV website or the back of your license to see if one appears on yours.
What should I do if I cannot find the audit number on my license?
Contact your state DMV directly. They can tell you whether your state uses an audit number, where it appears on the current license design, and help you locate it on your card. You can usually reach them by phone or through their website.
Can someone use my audit number to commit fraud?
The audit number alone is not enough to commit fraud, but it is part of your official identity document. Treat it with the same care you would your license number — do not share it with unknown parties or post it online. If your license is stolen, report it to the DMV when ready.
Will my audit number change when I renew my license?
Usually yes. When you renew, the DMV issues a new card with a new audit number. The old number is kept in your file history so the DMV can link your records together, but the new card has its own unique audit number.