Is an Alien Number the Same as a Green Card Number

For U.S. immigration records, two identifiers often come up: the Alien Number, also known as the A-Number, and the Green Card Number found on the Permanent Resident Card. Although both relate to immigration status, they serve different purposes and appear in different contexts. This article explains how they differ, where to find them, and why the distinction matters for applications, updates, and records with USCIS and other authorities.

What Is An Alien Number (A-Number)

The Alien Number, or A-Number, is a unique 7 to 9 digit identifier assigned by the U.S. Citizenship and Immigration Services (USCIS) or the former INS. It is typically formatted as a prefix A followed by digits, for example A123456789. The A-Number is used across immigration processes to track an individual’s case history, petitions, interviews, and status changes. It appears on official notices, petitions, and documents such as the Notice of Action (Form I-797) and change-of-address forms. The A-Number remains constant over time, even as a person’s visa status or card expires or is renewed.

What Is A Green Card Number?

The Green Card Number refers to the card-specific identification printed on the Permanent Resident Card (Form I-551). This card number is a distinct, often alphanumeric sequence that uniquely identifies the physical card itself, separate from the person’s immigration file. The card number is used by card-issuing authorities, airlines, employers, and similar institutions when verifying the validity of a permanent resident card. It is not meant to replace or duplicate the A-Number; rather, it serves as a card-level reference for administrative purposes.

Key Differences At A Glance

• <strong purpose: A-Number tracks an individual’s immigration case history; Green Card Number identifies the physical card and authorization document.
• <strong format: A-Number is typically A followed by 7–9 digits; Green Card Number is a 13-character alphanumeric code on the card.
• <strong use: A-Number appears in USCIS notices, applications, and case files; Green Card Number appears on the card and in card verifications.
• <strong permanence: A-Number stays with the person across status changes; Green Card Number may change if a card is replaced or updated.

Where To Find Each Number

Finding the A-Number: It appears on several USCIS documents, including the Receipt Notice (Form I-797), the Notice of Action, and the Green Card itself depending on the issuance era. It is also listed in case status portals and on certain immigration forms such as the Form I-485 adjustment of status packet. If someone can’t locate the A-Number, USCIS may request identity verification or a request for records through the Freedom of Information Act (FOIA).

Finding the Green Card Number: The card number is printed on the Permanent Resident Card, typically on the front in the lower portion or near the barcode, depending on the card design. It is a distinct card-specific identifier and is different from the A-Number. Cardholders should ensure this number is kept secure to prevent misuse, just as with any government-issued document.

Readers’ Common Questions

1. Can I use my Green Card Number instead of my A-Number? No. The A-Number and the Green Card Number serve different purposes. For USCIS applications and case files, the A-Number is the primary identifier. The Green Card Number verifies the physical card but does not substitute for case history.
2. If I lost my A-Number, how can I recover it? Review USCIS notices, e-file confirmations, or contact USCIS directly. You may need to provide identity documents to retrieve or confirm the A-Number. A FOIA request can also help obtain official records that include the A-Number.
3. Is the A-Number always listed with the Green Card Number? Not always. Some documents emphasize the A-Number for case management, while the card number is used for physical verification. It’s important to use the correct identifier for the specific process you’re engaging in.
4. Are A-Numbers and Green Card Numbers secure? Yes, but both are sensitive identifiers. Share them only with trusted entities and through official channels to avoid identity theft or fraud.

Practical Implications For Applications And Records

Understanding the distinction helps when completing applications, updating information, or responding to requests from USCIS or employers. If an application asks for an A-Number, supplying the A-Number will ensure the request is correctly linked to the right case. If a verification process asks for a card number, the Green Card Number on the actual card should be provided. Inconsistent or mixed references can delay processing or trigger verification holds. When in doubt, cross-check both numbers on official documents and consult USCIS resources or an immigration attorney for precise guidance.

Best Practices For Handling These Identifiers

• Keep both numbers secure: Store them separately in a secure location and avoid sharing them in unsecured emails or public platforms.
• Document accuracy: Double-check the exact formatting when entering numbers into forms—A-Number formats may vary (A followed by digits), and card numbers are usually alphanumeric with specific length.
• Update records promptly: If personal information changes or a new card is issued, update USCIS records as required and preserve old identifiers for reference.
• Seek official guidance: If unsure, rely on USCIS documentation, official portals, or professional immigration counsel to avoid errors in applications or communications.

Additional Resources

For authoritative details, consult USCIS resources on A-Numbers and Permanent Resident Cards, and consider official FAQs and forms related to your specific immigration status. If a person is dealing with a family member’s case or employer-sponsored pathways, internal HR departments or immigration lawyers can provide tailored guidance on where to locate and how to use these identifiers correctly.