Driver's license numbers are formatted differently in every state, and most include both letters and numbers
Your driver's license number is not the same across states. Some states use only numbers. Others mix letters and numbers in a pattern that encodes information about you — your name, birth date, or sex — directly into the license number itself. A few states use letters as separators or check digits. The format you see depends entirely on which state issued your license.
If you move to a new state or renew your license, your number will change to match that state's system. There is no national standard, and the federal REAL ID Act does not dictate the format of the number itself — only what documents you need to prove your identity and address.
Key Takeaways
- Most states include letters in their driver's license numbers, but the position and meaning of those letters varies by state.
- Some states encode your last name, first name, or birth date into the license number using letters and numbers together.
- A few states use only numbers, while others use letters only as check digits or separators with no personal information encoded.
- Your license number will change if you move to a different state, because each state has its own numbering system.
- The format of your license number does not affect how you use it for identification or legal purposes.
States that encode names and birth dates into the license number
New York, New Jersey, and several other states build your personal information directly into your license number using a mix of letters and numbers. In New York, for example, the first letter of your last name appears first, followed by numbers derived from your birth date and a code for your first and middle names. This system makes the license number itself a compressed record of who you are.
Other states use similar encoding but in different orders. Some place the birth date first, others place it in the middle. The point is that if you know the state's formula, you can decode parts of the number — but only if you have the state's specific key. A New York license number decoded using New Jersey's rules will give you garbage.
This encoding serves a practical purpose: it helps DMV staff and law enforcement quickly verify that the number matches the person holding the card. It also reduces the chance of duplicate numbers, since the formula is tied to real biographical data.
States that use numbers only or letters as check digits
California, Texas, Florida, and many other large states use sequential or random numbering systems with no encoded personal information. Your license number in these states is straightforward a unique identifier assigned to you — it does not tell anyone your name or birth date just by looking at the digits.
Some of these states do include letters, but only as a check digit — a letter or number at the end that helps computers verify the number is valid. The check digit itself does not encode information about you; it is a mathematical safeguard against typos or fraud. If someone types your license number wrong, the check digit will not match, and the system flags it as invalid.
A few states use letters as separators between groups of numbers, purely for readability on the physical card. These letters are not part of the actual number used in databases.
How to find out your state's format
The easiest way to understand your own license number is to look at your physical card and compare it to your state's DMV website. Most state DMV sites have a page explaining license number format, often under sections titled "License Number Format," "Understanding Your License," or "License Information."
You can also call your state DMV directly and ask. Have your license number and state ready. Staff can tell you what each part of your number means and whether any information is encoded into it.
If you are trying to understand someone else's license number — for example, to verify it matches their identity — you will need to know which state issued it. The state abbreviation or full state name usually appears on the front of the card.
What happens to your license number when you move or renew
If you move to a new state and get a license there, you will receive a completely new number in that state's format. Your old number is no longer active. This is why it is important to update your address with any organization that has your license number on file — banks, employers, insurance companies — so they have your new number.
When you renew your license in the same state, your number usually stays the same. Some states change the number on renewal for security reasons, but most do not. Check your state's renewal rules on the DMV website or call to confirm.
If you have a REAL ID-compliant license, the format of the number does not change. REAL ID affects what documents you need to prove your identity and address, not how your license number is structured.
Why the format matters for verification and records
Organizations that check your license — banks, police, employers — use your license number as a unique identifier to pull up your record in their system. The format does not matter to them; what matters is that the number is valid for your state and matches the name on your card.
If you are filling out a form that asks for your driver's license number, type it exactly as it appears on your card, including any letters. Do not try to "correct" it or reformat it. The system on the other end is expecting your state's format, and changing it may cause the form to reject your entry or create a mismatch in records.
If you are verifying someone else's license — for example, checking that a customer's ID is real — you do not need to decode the number. You only need to confirm that the number format matches what your state uses, and that the number is not obviously fake (like all zeros or all the same digit).
Common confusion about license numbers and personal information
Many people worry that their license number reveals too much about them. In states that encode birth dates or names, the number does contain that information — but only if someone knows the state's encoding formula. A stranger looking at your license number cannot decode it without that knowledge.
In states that use random or sequential numbering, your license number reveals nothing about you at all. It is just a number.
Either way, your license number is not a secret. It appears on your physical card, which you show to police, banks, and businesses regularly. If you are concerned about privacy, the issue is not the format of the number — it is how organizations store and use that number once they have it.
Frequently Asked Questions
Does every state include letters in the driver's license number?
No. Some states use only numbers, while others include letters. The format depends on the state. Check your state's DMV website or call the DMV to find out whether your state's numbers include letters and what they mean.
If I move to a new state, do I keep my old license number?
No. Your license number is tied to the state that issued it. When you get a license in a new state, you receive a new number in that state's format. Your old number is no longer active.
Can someone figure out my birth date from my license number?
Only if your state encodes birth dates into the number and someone knows your state's formula. In states that use random or sequential numbering, your license number reveals nothing about your birth date. Even in states that do encode it, the formula is not widely known outside the DMV.
What is a check digit on a driver's license?
A check digit is a letter or number at the end of your license number that helps verify the number is valid. It is calculated using a mathematical formula based on the rest of your number. If you type your license number wrong, the check digit will not match, and the system flags it as invalid.
Should I type my license number exactly as it appears on my card?
Yes. Always type your license number exactly as it appears on your card, including all letters and numbers in the same order. Do not try to reformat it or leave out letters. The system expecting your number is set up for your state's format.