The customer identifier is a number the DMV assigns to track your driving record

The customer identifier on your driver's license is a unique number issued by your state's Department of Motor Vehicles (DMV). It exists solely to link your driving record, vehicle registrations, and license history to you in the DMV's system. It is not the same as your driver's license number, and it is not a Social Security number or any other federal identifier.

This number appears on your physical license card, usually near the top or bottom depending on your state's design. When you renew your license, get a replacement card, or move to a new state, the DMV uses this identifier to pull up your complete history — traffic violations, suspensions, points, vehicle ownership — without having to re-enter everything from scratch.

The customer identifier stays with you as long as you hold a license in that state. If you move to another state and get a new license there, that state's DMV assigns you a new customer identifier for their system.

Key Takeaways

  • The customer identifier is a state-specific number the DMV uses to organize your driving record and license history in their database.
  • It appears on your physical license card and is different from your driver's license number.
  • The DMV uses this number when you renew, replace, or update your license so they do not have to re-enter your information.
  • Each state maintains its own customer identifier system, so moving to a new state means getting a new number.

Where to find the customer identifier on your license

The location varies by state. In many states it appears in the upper left or upper right corner of the front of the card. In others it is printed along the bottom edge. Some states label it clearly as "Customer ID" or "Customer Number," while others may print it without a label, making it less obvious.

If you cannot locate it on your physical card, you can call your state's DMV directly and provide your name and date of birth. They will read it to you over the phone. You can also log into your state's online DMV portal if one exists — most states now offer account access where you can view your license details, including the customer identifier.

Why the DMV created this system

Before customer identifiers, the DMV had to manually search paper records or early computer systems using your name and date of birth. This was slow and error-prone, especially if you shared a common name or if there were spelling variations in how your name was recorded.

The customer identifier solved this problem by giving each person a single unique number. Now when you walk into a DMV office or renew online, the staff member or system can pull up your entire file in seconds using just that number. It also prevents mix-ups when two people have similar names or when records are transferred between offices.

How the customer identifier differs from your license number

Your driver's license number is what appears most prominently on your card — it is the number you give when you are pulled over or when you need to prove your identity. It is printed on the front of the card in large text and is what law enforcement and other agencies see first.

The customer identifier is an internal DMV tracking number. It is not used for identification in the field. Police officers, insurance companies, and other third parties do not typically see or use the customer identifier — they use your license number instead. The customer identifier is mainly for DMV staff and the DMV's own computer systems.

When you renew your license in the same state, your license number usually changes, but your customer identifier stays the same. This is how the DMV knows you are the same person with the same driving history, even though your license number is new.

What happens to your customer identifier when you move states

If you move to a new state and obtain a driver's license there, your old state's customer identifier does not follow you. The new state's DMV assigns you a brand new customer identifier in their system. Your driving record from your previous state may be transferred to the new state (most states share records through the National Driver Register), but the identifier number itself is state-specific.

This means you will have different customer identifiers in each state where you have held a license. If you move back to a state where you previously held a license, the DMV may or may not reactivate your old customer identifier — this depends on how long ago you left and that state's record retention policies.

Privacy and security considerations

The customer identifier is not considered sensitive personal information in the way a Social Security number is. It is tied to your driving record, which is a public document in most states. However, you should not share it casually, as it can be used to look up your driving history if someone has access to DMV records.

If you are concerned about your privacy or believe your customer identifier has been misused, contact your state's DMV directly. They can review your account for unauthorized access or fraudulent activity. Some states also allow you to place a security freeze on your DMV record, similar to a credit freeze, which restricts who can view your information.

Frequently Asked Questions

Is the customer identifier the same as my driver's license number?

No. Your driver's license number is the main identifier on your card that you show to police or use for identification. The customer identifier is an internal DMV number used to organize your records in their system. Your license number changes when you renew; your customer identifier usually stays the same.

Can I look up someone else's customer identifier?

Generally, no. The customer identifier is part of your driving record, which is public in most states, but you cannot straightforward search for it online. You would need to request someone's driving record through official channels, which usually requires a valid reason and may involve a fee.

What should I do if I cannot find the customer identifier on my license?

Call your state's DMV and provide your name and date of birth. They will tell you the number. You can also check your DMV account online if your state offers one, or visit a local DMV office in person and ask a staff member to point it out on your card.

Does the customer identifier change when I renew my license?

Usually not. The customer identifier is designed to stay constant throughout your time as a licensed driver in that state. Your license number will change, but the customer identifier typically remains the same so the DMV can track your complete history.