For many aliens, obtainingan A-number is an important first step in the march toward citizenship. Alienswho carry green cards can apply for housing and utilities, seek employment,open bank accounts, obtain state-issued drivers licenses, and do much more.

Also known as a Permanent Resident Card, Form I-551, or alien registration card. USCIS issues Green Cards to aliens as evidence of their lawful permanent resident status in the United States. For Form I-9, it is acceptable as proof of identity and employment authorization.

What is an Alien Registration Number or “A” number? It is a unique seven-, eight- or nine-digit number assigned to a noncitizen. The 9-digit USCIS number listed on permanent resident green cards issued after May 10, 2010, is the same as the A-number. The A-number can also be found on the back of green cards.

The green card number — also known as the receipt number or the permanent resident number — is located on the bottom of the back of the card, in the first line of a long string of 90 characters.

How do I find my Alien Registration Number for my H-1B visa? For H-1B applicants, once your employer files the PERM application and I-140, then USCIS will assign you an Alien Registration Number. You can find it on Form I-797C Notice of Action under Beneficiary Alien Number.

FAQ. Where is My A Number? You can find your USCIS A-number on your EAD card, Green Card, Immigrant visa stamp, i140 approved i797 form, or work visa i797 C receipt notice.

The I-94 number is an 11-digit number that is found on the Arrival-Departure Record (Form I-94 or Form I-94A). The nine-digit U.S. Citizenship and Immigration Services number listed on the front of Permanent Resident Cards (Form I-551) issued after May 10, 2010, is the same as the Alien Registration Number.

You can check your case status by calling the USCIS Contact Center at 1-800-375-5283. You will need your receipt number when you call in. This is useful if you do not have access to a computer to check your green card status.