|As I am unable to use my client file, this is a copy of a Sample Registration on the NARA Website.|
The Purpose and Process of the 1940 Alien Registration?
The KC National Archives and Records Administration (NARA) newsletter of July 2011 states the process best.
The Alien Registration Form contained fifteen questions including when and where the subject was born, when and where they entered the United States, a physical description, and inquiries about employment, organization memberships, prior military service, and attempts to obtain naturalization in the U.S. As Immigration and Naturalization Services (INS) received the forms, an Alien Registration Number was assigned (ex. A12 345 678) and an Alien Registration Receipt Card containing this number was mailed to each registrant as proof of alien status. For additional information, visit the NARA website:
These documents have not been digitized, but OPA or ARC may be used to narrow down your ancestor's alien number by an inquiry of name, date of birth or country.