An alien registration number serves as the unique identifier assigned by U.S. Citizenship and Immigration Services (USCIS) to every person required to register as an alien. This number, often called the A-number, appears on the front of the permanent resident card and is essential for tracking immigration records. Understanding its location and purpose helps individuals manage their status without confusion.
What Is an Alien Registration Number?
An alien registration number is a distinct code issued by USCIS to identify a non-citizen in the United States immigration system. This identifier remains with a person throughout their immigration journey, even if their status changes from temporary visitor to lawful permanent resident. The number is printed on official documents, ensuring that government agencies and service providers access the correct file quickly.
Where to Find the A-Number
Locating the alien registration number depends on the document in your possession. On most evidence of alien registration, the number is prominently displayed.
On a Permanent Resident Card (Green Card), the A-number is printed in the top section, usually in the center or slightly to the right.
On an Employment Authorization Document (EAD), the number appears in the upper right corner.
In the USCIS case file, the number is listed at the top of all correspondence and documents associated with your case.
Decoding the Format
The structure of an alien registration number follows a specific pattern that can indicate the era in which it was issued. Older numbers, known as "pre-2010" numbers, often start with the letter "A" followed by seven or eight digits. Newer numbers, issued after 2010, typically begin with the letter "I" followed by seven or eight digits. This format helps immigration officers quickly verify the type of case and the timeline of issuance.
Why the Number Matters
Beyond identification, the alien registration number is the key to accessing critical immigration services. It is required when applying for work authorization, changing employers, or adjusting status. Without this number, individuals may face delays or complications when interacting with USCIS or when providing documentation to employers and educational institutions.
Common Situations Requiring the A-Number
Individuals frequently encounter scenarios where presenting the alien registration number is necessary. Having this information readily available streamlines processes and reduces administrative friction.
Applying for a Social Security card.
Filing taxes with the Internal Revenue Service.
Seeking driver’s license eligibility in various states.
Petitioning for family-based immigration benefits.
Losing Access to the Number
If an individual misplaces their physical card or document, they can still retrieve their alien registration number. By creating an account on the USCIS website, users can view their case details online. Alternatively, contacting the USCIS National Customer Service Center provides assistance for those unable to access the information digitally.
Distinguishing A-Number from Other IDs
It is important to differentiate the alien registration number from other identification codes. The Department of Homeland Security uses the term "USCIS Number" interchangeably with the A-number, referring to the same unique code. While a Social Security Number provides access to social benefits, the A-number specifically tracks immigration history and legal status within the United States.
