1. News & Issues
You can opt-out at any time. Please refer to our privacy policy for contact information.

Alien Registration Number


Passport control with british passport
Peter Dazeley/Photographer's Choice/Getty Images
Definition: The alien registration number or "A-number" is an identifying number that USCIS assigns to certain aliens, such as those who apply for adjustment of status. A-numbers may consist of 8 or 9 digits. The A-number is yours for life, much like a social security number. From USCIS: Alien registration began in August 1940 as a program to record every non-citizen within the United States. The original Act of 1940 was a national security measure, and directed the former INS to fingerprint and register every alien age 14 and older within and entering the United States.
Also Known As: A-number, A#, Alien number, Green card number

©2014 About.com. All rights reserved.