Navigating U.S. immigration paperwork often feels like deciphering a complex code of acronyms and digits. Among these, the USCIS Registration A-number stands out as the most critical. Also known as an "Alien Registration Number" or simply an "A-Number," this seven-to-nine-digit identifier acts as your permanent account number within the Department of Homeland Security (DHS) system.
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Unlike a receipt number, which changes with every application you file, your USCIS Registration A-number remains the same throughout your entire journey—from your first work permit to your eventual citizenship ceremony.
Where to Look: Common Document Locations
If you have already engaged with USCIS, your A-Number is likely hidden in plain sight on your official documents. In 2026, USCIS has standardized its forms to make this number more prominent, but its label can vary depending on the document.
1. The Green Card (I-551)
On permanent resident cards issued after May 10, 2010, the A-Number is listed as the "USCIS#". You can find it on the front of the card, usually right below your name or near your photo.
2. Employment Authorization Document (EAD)
If you have a work permit, look for the "USCIS#" on the front of the card. This is your USCIS Registration A-number. Note that the "Card#" (which starts with three letters) is a separate identifier specifically for that physical card.
3. Immigrant Visa Stamp
If you entered the U.S. through consular processing, check your passport for your visa foil (stamp). Your A-Number is often labeled as the "Registration Number" in the top right-hand portion of the visa.
4. Notice of Action (Form I-797)
USCIS receipt and approval notices are excellent places to find your number. On most I-797C forms, the A-Number is located in the top-right field labeled "USCIS#" or "Beneficiary A-Number."
A-Number vs. Receipt Number: Avoiding Confusion
It is a common mistake for applicants to confuse their USCIS Registration A-number with their Receipt Number.
- Receipt Number: A 13-character identifier (e.g., EAC, LIN, or IOE followed by 10 digits) that is unique to a specific application.
- A-Number: A 7-to-9 digit number (e.g., A123456789) that is unique to you.
Think of the receipt number as an "order number" for a specific request, while the USCIS Registration A-number is your permanent "customer ID." Even if you have five different receipt numbers for five different forms, they should all be linked back to the same A-Number.
What to Do If You Can't Find It
If you have lost your original documents or never received an A-Number, do not panic. Not everyone in the U.S. has one—specifically, nonimmigrants on temporary visas like the B-1/B-2 tourist visa usually do not receive an A-Number until they apply for an employment benefit or adjustment of status.
If you are certain you have been assigned one but cannot locate it, you can:
- Check Your I-94: In some cases, CBP officers hand-write the A-Number on the back of a paper I-94, though this is increasingly rare in the digital age.
- Review Old FOIA Requests: If you have ever requested a copy of your file, your A-Number will be at the top of every page.
- Consult Your Attorney: Your legal representative will have this number on file for all your submissions.
Conclusion: Keeping Your Identity Secure
Your USCIS Registration A-number is the "golden thread" that connects your entire immigration story. By knowing where to find it and understanding its permanence, you can move through the 2026 immigration landscape with the confidence that your records are unified and accurate.
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