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What is the ‘Alien Registration Number’?

The Alien Registration Number (A-Number) is a unique identification essential to organize and track the immigration history of foreigners in the United States.

Written by

Victoria Harper

Editor-in-Chief

Updated on November 23, 2025
2 min read
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When it comes to immigration to the United States, for example in the context of visas such as the EB-3, it is very common to encounter terms and numbers that may seem complicated at first glance. One of them is the ‘Alien Registration Number’, often called the A-Number, which is a unique identification issued by the American government.

The Alien Registration Number is an immigrant registration number usually composed of nine digits. Every person who goes through immigration processes with the United States Department of Homeland Security (DHS) is assigned this number. It serves to identify and track the individual’s immigration history within government systems, facilitating the verification of information in applications for benefits, status adjustments, or document renewals.

Additionally, the A-Number appears on various forms and records, becoming essential to maintain an organized and secure history of immigrants’ information. Therefore, it is important that all information related to this number – including annotations and updates made by authorities – is always correct and up to date.

It is important to emphasize the significance of strictly following United States immigration laws. Seeking guidance from reliable sources, reviewing procedures, and avoiding scams or unfounded marketing promises can make all the difference for a safe immigration journey. If there are any doubts, consulting official information and, if possible, recognized specialists on the subject is always a prudent practice.

In summary, the Alien Registration Number is a vital tool for the U.S. immigration system, contributing to the organization and management of immigrants’ status, and its proper use and maintenance are essential for those following a legitimate and secure immigration path.

Learn more about EB-3 Visa

Category
EB-3 Green Card (3rd priority)
PERM
Required
Requirement
Skilled worker
Processing
1-10 years
All about EB-3 Visa
Victoria Harper

Editor-in-Chief

Meet the author

Leading journalism and editorial content at Visto n’ Visa, Victoria helps make immigration topics clear, trustworthy, and easy to understand. Her focus is on delivering useful, human, and relevant content for people exploring new paths abroad.

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What is the ‘Alien Registration Number’?

The Alien Registration Number (A-Number) is a unique identification essential to organize and track the immigration history of foreigners in the United States.

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