A Number

All immigrants to the United States are assigned a unique registration number for identification purposes. This number is commonly referred to as an Alien Registration Number, Alien Number, A-Number, or A#. Find out more about your A-Number number here.

What is my immigration A-Number?

Your Alien Registration Number (“A-Number”, “Alien Number” or “A#”) is a seven-to-nine-digit number that US Citizenship and Immigration Services (USCIS) gives to most immigrants who apply to live in the US. Your A-Number is used to track your US immigration matters with USCIS. Most USCIS forms require your A-Number.

How do I get an A-Number?

All immigrants who apply to live in the US permanently are assigned an A-Number. If you apply for a Permanent Resident Card (Green Card) or another type of Immigrant Visa, you will receive an Alien Number (A-Number). If you are on a tourist or business visitor visa, you will not receive an A-Number as you are only in the US temporarily (non-immigrant) and not seeking to immigrate permanently(immigrant). The exception is for those in the US as students on an F-1 visa with work authorization, they received an A-Number.

What is the difference between an A-Number and a USCIS Number?

Your Alien Registration Number (A-Number) is used by USCIS to track you across multiple applications. A USCIS Case Number refers to one (1) specific application. Your A-Number is a nine-digit number, while a USCIS Case Number consists of a combination of three letters and ten numbers and is a total of 13 characters.

How do I find my A-Number?

Your A-Number can appear on several different immigration documents. Such as:

  • Your Permanent Resident Card (Green Card)
  • Your Employment Authorization Document
  • Your Immigrant Visa
  • If you have applied to be a permanent US resident, your A-Number can be found on most documents your received from USCIS and can be found at the top of the page under “A#”
  • Your A-Number may also appear on other US Immigration documents if you are an intending immigrant to the US

Green Cards through Employment Sponsorship Green Cards for Family Members

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