A drivers license number (DL number) is a unique combination of letters and digits assigned to a driver when they apply for their first drivers license in a state. The format of a DL number varies by state, but it is usually prominently located on the front of the drivers license card. The number may consist of a combination of letters and numbers, and it may be formatted differently depending on the state. For example, in Kentucky, the DL number is printed towards the top center of the license next to "4d." and "DLN". In Louisiana, the DL number can be found towards the center of the license under "License/ID NO.".

If a driver has lost their license and needs to know their DL number, they can usually find it listed next to the item "4d" on their license card. However, if they have an expired license from another state, the number may be different from their current DL number. They can also call the agency that issued their license to ask for their DL number, but they may need to verify their identity first.