Alien Registration Number (A-Number)
An alien registration number, or A-number, is a unique 7- to 9-digit number that the Department of Homeland Security assigns to many noncitizens, written with an "A" in front (for example A123456789). It stays the same for life and links all of your immigration files.
Where to find it
On a green card it is labeled "USCIS#." On a work permit (EAD) it appears as "USCIS#" too. You may also see it on USCIS notices, an immigrant visa stamp, or court papers from immigration court.
Not everyone has one. Most visitors, students, and temporary workers never get an A-number. You usually receive one when you apply for a green card, an EAD, asylum, or when you are placed in removal proceedings.
The A-number is different from your USCIS online account number and from the 13-character receipt number on a receipt notice.
Frequently asked questions
Is the A-number the same as the USCIS number?
Yes. Newer green cards and EADs label the A-number as "USCIS#."
What if I have two A-numbers?
This sometimes happens by mistake. Tell USCIS so the files can be combined, and list both numbers on forms if asked.
Do tourists have an A-number?
Usually not. Visitors and most students have an I-94 number instead.
Official sources
- USCIS: Glossaryuscis.gov
General information, not legal advice. NorthAmericans.com is independent and not affiliated with any government.