How To Get Your Alien Registration Number: A Technical Guide To Identification Retrieval

The Alien Registration Number, often abbreviated as an A-Number or A#, is a unique seven-, eight-, or nine-digit identifier assigned by the Department of Homeland Security (DHS) to non-citizens who apply for specific immigration benefits or are subject to enforcement actions. You can obtain or locate this number by inspecting your Permanent Resident Card (Green Card), Employment Authorization Document (EAD), or official USCIS correspondence such as Form I-797 Approval Notices.

Identification Protocols and Documentation Requirements

Before attempting to locate or request an Alien Registration Number, it is vital to understand that this identifier is not automatically issued to every foreign national entering the United States. It is a permanent file number assigned to an individual’s "A-File" (Alien File) within the federal immigration records system. Temporary visitors, such as those on B-1/B-2 tourist visas or most short-term non-immigrant workers, generally do not receive an A-Number unless they have previously applied for a change of status, work authorization, or permanent residency.

Essential Document Checklist

• Primary Identification: A valid foreign passport or a government-issued photo ID to verify your identity before requesting records.
• USCIS Correspondence: Form I-797 (Notice of Action), specifically Approval Notices for petitions such as I-140 (Immigrant Petition for Alien Worker), I-130 (Petition for Alien Relative), or I-765 (Application for Employment Authorization).
• Immigration Status Documents: Your Form I-551 (Permanent Resident Card) or Form I-766 (Employment Authorization Document).
• Visa Records: Your machine-readable immigrant visa (MRIV) usually found in your passport if you entered the U.S. via consular processing.
• Systemic Knowledge: Familiarity with the difference between a USCIS Case Number (13 characters starting with three letters like LIN, SRC, or MSC) and an A-Number (purely numeric).

Administrative Benchmarks

• Processing Time: If you do not have an A-Number and are filing for one (e.g., through an I-485 application), the assignment occurs upon the receipt and initial processing of the application, typically within 30 to 90 days.
• Digit Standardization: If your A-Number has only seven or eight digits, you must add leading zeros to make it a nine-digit number for modern electronic filing systems (e.g., A1234567 becomes A001234567).

Locating and Securing Your Alien Registration Number Across Federal Documents

The process of "getting" your A-Number is essentially a retrieval operation from existing records, as the number is assigned by the government during the lifecycle of an immigration case. Follow these technical steps to identify the number across various official platforms.

Step 1: Inspecting Permanent Resident Cards (Green Cards)

For those who have already attained legal permanent residency, the A-Number is prominently displayed. However, the nomenclature has changed over time.

1. Modern Cards (Issued after May 10, 2010): Locate the field labeled "USCIS#." This nine-digit number is your Alien Registration Number. Do not confuse this with the card's serial number on the back.
2. Older Card Versions: Look for the field labeled "A#." It is typically located near the top of the card or under the "Registration Number" header.
3. Validation: Ensure the number matches the one listed on your I-485 Approval Notice.

Step 2: Extracting Data from Employment Authorization Documents (EAD)

If you are a student on F-1 OPT, an asylum seeker, or an applicant with a pending adjustment of status, your work permit is the most reliable source for your A-Number.

1. Field Identification: Look at the front of the I-766 card. The A-Number is listed under the "USCIS#" or "A#" heading.
2. Verification for Students: For F-1 students, this number is often first assigned when applying for Post-Completion Optional Practical Training. It will also be printed on your Form I-20 once the OPT is authorized, though the card itself is the primary legal source.

Step 3: Analyzing Immigrant Visas and Entry Summaries

If you have recently entered the U.S. with an immigrant visa but have not yet received your physical Green Card, your A-Number is already available.

1. Machine-Readable Immigrant Visa (MRIV): Open your passport to the page containing the U.S. visa. Locate the "Registration Number" field (often found in the top right-hand corner). This is your A-Number.
2. USCIS Immigrant Data Summary: If you processed through a U.S. Embassy or Consulate, you were likely given a "hand-carry" packet or an electronic equivalent. The data summary sheet stapled to the front of this packet contains the A-Number clearly labeled at the top.
3. IV Fee Payment Receipt: When you pay the USCIS Immigrant Fee online, the receipt and the instructions provided by the Department of State will include both your A-Number and your DOS Case ID.

Step 4: Auditing USCIS Approval Notices (Form I-797)

USCIS uses Form I-797, Notice of Action, for almost all communications.

1. The "Beneficiary" Field: On many approval notices, specifically for I-129, I-140, or I-130 petitions, the A-Number is listed above or next to the "Beneficiary" name.
2. I-797C Receipt Notices: Sometimes a receipt notice for a pending application will contain the A-Number if the applicant has been previously entered into the DHS system. If the field says "None" or is blank, it means the number has not been assigned yet or was not linked to that specific filing.

Step 5: Utilizing the Freedom of Information Act (FOIA) for Retrieval

If you have lost all your documents and cannot remember your A-Number, you must engage in a formal records request.

1. Form G-639 Submission: File a FOIA request using Form G-639. This is a no-fee service that allows you to request a copy of your entire Alien File or specific identifying information.
2. Required Information: You must provide your full name, date of birth, place of birth, and any other aliases.
3. Notarization: To protect privacy, you must sign the request under penalty of perjury or have it notarized to prove you are the subject of the record.
4. Response Windows: FOIA requests can take several weeks to several months depending on the complexity of the file and the current backlog at the National Records Center.

Warning: Never use a fabricated A-Number on official government forms. Providing an incorrect or "placeholder" number can lead to significant delays, the misrouting of your immigration file, or allegations of misrepresentation.

Document Type and A-Number Displacement Matrix

The following table serves as a quick-reference guide for identifying where the Alien Registration Number is located on standard Department of Homeland Security and Department of State documentation.

Administrative Discrepancies and Data Retrieval Protocols

In complex immigration journeys, it is common to encounter errors in documentation or confusion regarding multiple identifiers. The following scenarios outline common failures and the necessary remedial actions.

• Scenario 1: Missing A-Number on Non-Immigrant Notices

  
  
  
  • Root Cause: Holders of H-1B, L-1, or O-1 visas are often not assigned an A-Number until an I-140 Immigrant Petition or an I-485 Adjustment of Status is filed.
  • Actionable Fix: Check the I-140 Approval Notice specifically. If the employer filed the petition, the A-Number is usually assigned at that stage. If it is still missing, wait for the I-485 Receipt Notice (Form I-797C), which is the definitive trigger for A-Number generation for most employment-based applicants.

• Scenario 2: Conflict Between "USCIS Number" and "Case Number"

  
  
  
  • Root Cause: Applicants often mistake the 13-character Receipt Number (e.g., EAC-21-000-55555) for the A-Number.
  • Actionable Fix: Segregate the identifiers. The Receipt Number identifies a specific application, whereas the A-Number identifies the individual. If a form asks for your A-Number and you only have a Receipt Number, and no A-Number appears on your documents, leave the field blank or write "N/A" unless you are certain you have been assigned one.

• Scenario 3: Multiple A-Numbers Assigned to One Individual

  
  
  
  • Root Cause: Occurs when an individual has multiple immigration proceedings (e.g., a student who later applies for asylum and then marries a U.S. citizen) and the government fails to consolidate the files.
  • Actionable Fix: You must contact USCIS or your legal representative to request a "Consolidation of A-Files." Failure to merge these can lead to fragmented background checks and delays in naturalization. Use the number associated with your most recent permanent status until the consolidation is confirmed.

• Scenario 4: Leading Zero Errors in Electronic Filing

  
  
  
  • Root Cause: Legacy A-Numbers were often seven or eight digits. Modern USCIS electronic systems (like myUSCIS) require a strict nine-digit string.
  • Actionable Fix: Manually insert one or two zeros at the very beginning of the number. For example, if your A-Number is 12345678, enter it as 012345678. This does not change your identity; it simply satisfies the data validation rules of the database.

Frequently Asked Questions

Is the Alien Registration Number the same as a Social Security Number?

No, the Alien Registration Number is issued by the Department of Homeland Security for immigration tracking, whereas a Social Security Number (SSN) is issued by the Social Security Administration for tax and benefit purposes. While some non-citizens may have both, they are entirely separate nine-digit strings and are not interchangeable on federal forms.

Can I get an A-Number if I am in the U.S. on a tourist visa?

Generally, no. B-1/B-2 visa holders are temporary visitors and are not assigned an A-Number. You will only receive one if you apply for a change of status to a category that requires an A-File, such as applying for permanent residency or certain types of work authorization.

Does an Alien Registration Number expire?

The number itself is a permanent identifier that stays with you for life, much like an SSN. Even if your Green Card expires or you leave the U.S. and return years later, your A-Number remains the same. It is only retired or superseded if you become a U.S. citizen, at which point your A-File is typically closed.

Where is the A-Number on an I-94 form?

Standard Form I-94 (Arrival/Departure Record) does not usually contain an A-Number. It contains an 11-digit Admission Number. However, in cases of refugees or parolees, the A-Number may be handwritten or stamped onto the I-94 by a Customs and Border Protection (CBP) officer at the port of entry.

What should I do if I find two different A-Numbers on my documents?

This is a technical error known as "dual files." You should notify USCIS via a scheduled InfoPass appointment or through your legal counsel to have the files merged. Continuing to use two different numbers can cause significant issues during the background check phase of a naturalization or visa renewal application.

Professional Immigration Compliance Integration

Ensuring the accuracy of your Alien Registration Number is the foundational step for all legal filings and employment eligibility verifications. If you are unable to locate your number through the standard document reviews outlined above, consider initiating a formal records request to maintain the integrity of your immigration history.