How To Find Alien Number: Comprehensive Verification And Lookup Guide

An alien number, officially known as the Alien Registration Number or A-Number, is a unique nine-digit identifier assigned by the Department of Homeland Security to non-citizens. Locating this critical number requires examining official immigration documents, such as permanent resident cards, employment authorization documents, or correspondence issued directly by the United States Citizenship and Immigration Services.

Prerequisite Documentation & Access Requirements

Accessing your Alien Registration Number requires an understanding of where federal immigration agencies print these identifiers across various security-vetted documents. Before beginning the search, ensure you have physical or digital access to your immigration history files, a secure workspace, and a basic understanding of federal document nomenclature.

• Essential Records: Previous USCIS notices of action, physical Green Cards, foreign passports bearing immigrant visa stamps, and Employment Authorization Documents (EAD).
• Mandatory Knowledge: Familiarity with the structure of an A-Number, which invariably begins with the letter "A" followed by exactly eight or nine numeric digits.
• Estimated Time and Cost: Retrieving the number from existing paperwork takes between five to fifteen minutes at zero cost, whereas requesting a replacement or file search through Freedom of Information Act channels can take several weeks and incur administrative processing fees.

Step-by-Step Procedure to Locate Your Alien Registration Number

Step 1: Examine Permanent Resident Cards and Green Cards

For lawful permanent residents, the physical Green Card serves as the most accessible repository for the A-Number. Inspect the front and back of the plastic card carefully to identify the distinct nine-digit sequence.

• Look toward the front of modern permanent resident cards, where the identifier is typically labeled directly beneath the card number as the USCIS number.
• On older versions of the card, the A-Number appears prominently at the top or center of the document alongside the holder's biographical data.
• Ensure you include the leading letter "A" when entering or recording the number for legal filings, noting that some digital government portals automatically prepend the letter while others require manual entry.

Pro-Tip: If your card has been lost or stolen, check expired permanent resident cards, state-issued driver's licenses tied to legal status, or tax returns filed through professional immigration attorneys where the A-Number was previously recorded.

Step 2: Review USCIS Notices of Action and Correspondence

Every formal petition, application, or receipt notice generated by the immigration service features a unique case tracking number as well as the applicant's permanent identifier.

• Locate physical or electronic Form I-797 (Notice of Action) documents received for previous visa petitions, adjustment of status filings, or naturalization applications.
• Scan the upper right-hand corner of the notice layout, specifically targeting the metadata block that lists the beneficiary's name, receipt number, and designated A-Number.
• Cross-reference multiple notices to verify that the nine digits match consistently across all historical agency communications.

Warning: Do not confuse your receipt number—which typically starts with three letters like EAC, WAC, LIN, or SRC followed by ten numbers—with your A-Number. Using a receipt number in place of an A-Number will cause immediate rejection of subsequent legal filings.

Step 3: Check Foreign Passports and Visas

Individuals who entered the United States on immigrant visas or through specific non-immigrant categories often have their permanent identifier stamped directly into their travel documents.

• Open your foreign passport to the page containing the immigrant visa foil or counterfoil sticker.
• Search the annotated text section of the visa stamp for a handwritten or digitally printed alphanumeric string starting with the letter A.
• Verify the entry against Department of State arrival records, such as the electronic Form I-94 arrival/departure record retrieval system.

Comparison of Official Documents Containing A-Numbers

Troubleshooting Missing or Unlocatable A-Numbers

• Root Cause: Complete absence of physical or digital immigration documents due to theft, natural disaster, or accidental destruction.
  
  
  • Actionable Fix: File a Form G-639 (Freedom of Information Act / Privacy Act Request) directly with the Department of Homeland Security to obtain your complete alien file, which will display the historical A-Number.
• Root Cause: Confusion between the Department of State identification number and the USCIS A-Number on older consular documents.
  
  
  • Actionable Fix: Consult the principal applicant's original visa petition package or contact the National Visa Center via their official inquiry portal to verify the correct identifier sequence.
• Root Cause: Non-immigrant status holders assuming they possess an A-Number when they only hold a standard Form I-94 admission number.
  
  
  • Actionable Fix: Review your current visa category; temporary visitors such as tourists on B-2 visas or students on F-1 visas do not automatically receive an A-Number unless they apply for employment authorization or permanent residency.

Frequently Asked Questions

What does an Alien Registration Number look like?

An A-Number consists of the capital letter "A" followed by eight or nine sequential digits. For example, a standard format appears as A123456789. It is assigned for life to every non-citizen who enters the United States immigration system for permanent residence or formal enforcement proceedings.

Is the USCIS number on a Green Card the same as an A-Number?

Yes, on modern permanent resident cards, the number labeled as the USCIS number is identical to the Alien Registration Number. Both terms refer to the exact same nine-digit federal identifier used to track an individual's immigration records.

Can I find my A-Number online using my Social Security Number?

There is no public online portal where you can query your Social Security Number to retrieve an A-Number due to federal privacy regulations. You must access your own physical immigration documents or submit a formal privacy request to the Department of Homeland Security to obtain it.

What should I do if my A-Number has only eight digits?

Older immigration files issued decades ago occasionally utilized eight-digit A-Numbers instead of the modern nine-digit standard. When completing contemporary electronic or paper forms that require nine digits, add a leading zero immediately after the letter A to satisfy digital validation requirements.

Secure Your Immigration Records Today

Ensure your immigration paperwork is fully up to date by locating and recording your official A-Number before initiating any new benefit applications. Consult qualified immigration counsel or leverage official agency portals to verify your records and maintain compliance with federal requirements.