Alien Registration Number: What Is It And Where To Find It

Vivien Thuri

When you apply to live in the US permanently, or to study, the US government will create your very own “Alien File”. On top of this, they’ll give your “A-File” a unique number, called your “Alien Registration Number”. In this article, you’ll learn what your Alien Number really is, and where it can be found.

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What is an Alien registration number - so-called A-number?

When you apply to live permanently in the US, the US government wants to keep a record of who you are. They do this by creating something called an “Alien File”. Unfortunately, this has nothing to do with UFOs - rather, your Alien File, or simply “A-File”, is a record of all your documentation and information.¹

When the United States Citizenship and Immigration Services (USCIS) creates your A-File, they’ll assign a number to it. This seven- to nine-digit number is known as your “Alien Registration Number”, “USCIS Number”, or simply “A-number”, and will stay with you throughout all future interactions with the USCIS.¹ ²

One thing to note - your Alien Registration Number is not the same as your I-94 Number. Your I-94 number is an eleven-digit number found on Form I-94, which you’ll have filled out when you first entered the US.³ ⁴

Where to find an Alien registration number?

If you’ve been scratching your head trying to figure out where to find your Alien registration number, then scratch no longer!

You can find your Alien Registration Number on your green card where it says USCIS-Number, if it was issued after May 10, 2010. You can also find it on the back of these cards.⁴


Additionally, if you don’t have your green card to hand, then you can also find your Alien Registration Number on your Employment Authorization Document (EAD), immigrant data summary, USCIS Immigrant Fee handout, and your immigrant visa stamp.

You can find your Alien Registration Number:

  • Where it says ‘USCIS#’ on your EAD


  • At the top of your immigrant data summary, which will have been stapled to your immigrant visa package at your US embassy or consulate appointment

  • At the top right-hand corner of your Immigrant Fee Handout, given to you at your US embassy or consulate interview

  • On the visa stamp in your passport, called the “Registration Number”⁵ ⁶

So, if for some reason you can’t find your alien number on your green card, then fear not - you have plenty of other options!

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  1. - Aliens, Refugees and Citizenship pdf.
  2. USCIS - Glossary
  3. USCIS - Form I-94
  4. E-verify - Glossary
  5. USCIS - List A documents
  6. USCIS - Tips on finding your A-number

All sources checked 17 June 2021

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