On a driver’s license, LN means “Last Name.” It labels the field that displays your family name or surname, and it appears on nearly every U.S. license so that anyone reading the card, whether a police officer, a TSA agent, or a bartender, can locate your surname without guessing which name is which.
Where You’ll See It on the Card
LN is printed near the top of the card’s front face, usually above or beside your last name, inside the block of personal identifying information that also holds your first name, date of birth, and address. The exact position shifts slightly from state to state, but the American Association of Motor Vehicle Administrators (AAMVA) Card Design Standard keeps the layout consistent nationwide.1American Association of Motor Vehicle Administrators. AAMVA DL/ID Card Design Standard 2020
Not every state prints the label the same way. Some use “LN,” others spell out “LAST NAME” or “SURNAME,” and a few skip the label entirely and rely on position. The underlying data is the same regardless of what the card shows.
How Your Last Name Is Stored in the Barcode
The PDF417 barcode on the back of the license stores your personal data in a machine-readable format. Your family name is encoded under the three-letter element identifier “DCS,” which stands for “Customer Family Name.” The standard defines it as “Family name of the cardholder. (Family name is sometimes also called ‘last name’ or ‘surname.’)”1American Association of Motor Vehicle Administrators. AAMVA DL/ID Card Design Standard 2020 A scanner at an airport checkpoint or traffic stop reads the surname directly from that field.
If your last name is too long to print on the card face, the barcode still stores the complete name. A separate truncation indicator (element “DDE”) flags whether the printed version was shortened, so the scanning system still has the full legal spelling.1American Association of Motor Vehicle Administrators. AAMVA DL/ID Card Design Standard 2020
REAL ID and the Last Name Field
If your license is REAL ID-compliant (marked with a gold star), the name in the LN field has to match the name on the identity document you presented when you applied, such as a passport or birth certificate.2eCFR. 6 CFR Part 37 – Real ID Drivers Licenses and Identification Cards If those don’t match, the license isn’t compliant.
There’s a specific rule for people who have only one name. The single name goes in the last name field, and the first and middle fields stay blank. Placeholder codes like “NFN” (no first name) aren’t allowed.2eCFR. 6 CFR Part 37 – Real ID Drivers Licenses and Identification Cards
Other Abbreviations Near LN
LN sits in a cluster of short labels. The common ones:
- FN: First Name.
- DOB: Date of Birth.
- ISS: Issue Date, the date the current card was printed.
- EXP: Expiration Date.
- DL or DLN: Driver’s License Number, the unique number assigned to your driving record.
- DD: Document Discriminator, which identifies the specific physical card rather than your driving record and changes every time you get a new card.
- CLS or CLASS: License Class (Class D for a standard passenger car in most states; Class A or B for commercial vehicles).
- RSTR: Restrictions, followed by codes for conditions such as corrective lenses.
- END: Endorsements, for added privileges like motorcycle or hazardous materials.
- SEX: The license holder’s sex or gender.
Restriction and endorsement codes vary by state, though the general categories are consistent because AAMVA’s standards define the data elements every jurisdiction encodes.1American Association of Motor Vehicle Administrators. AAMVA DL/ID Card Design Standard 2020 If a code near RSTR or END isn’t familiar, your state DMV’s website will have the lookup table.
Changing or Correcting the Last Name on Your License
If the last name on your license is wrong or outdated, usually after marriage, divorce, or a court-ordered name change, the fix follows a predictable path. Fees and paperwork differ by state, but the sequence is similar everywhere.
Update your name with the Social Security Administration first. When you apply for a new license with a different last name, the DMV verifies the information against the SSA database, and a mismatch means the application gets denied. Give the SSA at least a couple of days to process the change before you go to the DMV.
At the DMV, plan to bring your current license, a legal document proving the name change (a certified marriage certificate, divorce decree restoring a former name, or court order), and proof of your Social Security number. For a REAL ID, you’ll also need a birth certificate or passport and two proofs of residency.2eCFR. 6 CFR Part 37 – Real ID Drivers Licenses and Identification Cards If your name has changed more than once, you may need documentation covering each change to build a chain from your birth name to your current legal name.
Most states charge a fee for the updated card, typically in the range of $10 to $40. You’ll usually get a temporary paper license at the counter, with the permanent card arriving by mail in two to four weeks. If the error was the DMV’s fault, some states waive the fee, so ask before you pay.