Alien Registration Number

An Alien Registration Number (often abbreviated as A-number) is a unique identifier assigned to non-citizens in the United States, used by immigration authorities to track their status and history. It typically consists of a combination of letters and numbers and appears on official documents related to immigration, such as green cards and work permits. This number helps streamline processing and maintains organized records for each individual's immigration journey, including applications, petitions, and any legal proceedings related to their status in the U.S.