Where Can I Find My Alien Registration Number?
You can find your Alien Registration Number on your permanent resident card (green card) and on other immigration documents like the Employment Authorization Document (work permit) or on Form I-797, Notice of Action.
Alien Registration Numbers, also known as A-numbers and USCIS numbers, are identification numbers assigned to all aliens by the U.S. Department of Homeland Security. These numbers have 9 digits preceeded by an “A”, for eg. A987654321. Some A-numbers may have just eight or seven characters.
These USCIS numbers are printed on both the sides of the green cards and on the front side of the work permit.
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