How To Get An Alien Registration Number: A Complete Step-by-Step Retrieval And Application Guide

An Alien Registration Number (A-Number) is a unique seven-, eight-, or nine-digit identifier assigned by the U.S. Department of Homeland Security (DHS) to noncitizens processing through the U.S. immigration system. You automatically acquire an A-Number by filing for permanent residency, employment authorization, or certain specialized visas; once assigned, you can find it printed on official documents like your Form I-797 Notice of Action, Green Card, or Employment Authorization Document (EAD).

Legal Triggers and Administrative Prerequisites

An Alien Registration Number is not a standalone document that you can apply for independently. Instead, it is a system-generated identifier created when the U.S. government opens an official "A-File" (Alien File) in your name. The creation of this file and the generation of your unique number are triggered by specific legal applications and administrative processes.

Pathways to Acquiring an A-Number

• Adjustment of Status (Form I-485): Filing an application to register permanent residence or adjust status automatically triggers the creation of an A-File and the assignment of your A-Number.
• Employment Authorization (Form I-765): Applying for a work permit, including F-1 student Optional Practical Training (OPT) or STEM OPT extensions, prompts U.S. Citizenship and Immigration Services (USCIS) to generate an A-Number.
• Immigrant Visa Consular Processing: If you are applying for an immigrant visa at a U.S. Embassy or Consulate abroad (via Form DS-260), the Department of State coordinates with DHS to assign your A-Number before you enter the United States.
• Refugee or Asylee Status: Individuals granted refugee status or asylum in the United States are legally required to have an A-File created, resulting in the immediate issuance of an A-Number.
• Fiancé Visas (K-1): Petitions filed via Form I-129F frequently result in the assignment of an A-Number to the foreign fiancé, which appears on the approved petition notice.

Required Documentation and Verification Tools

• USCIS Online Account Access: A verified digital portal login to trace pending electronic filings and receipt notices.
• Notice of Action (Form I-797C): The physical receipt or approval notice sent by USCIS following any formal submission.
• Immigration Visa Foil: The physical visa page affixed to your foreign passport if you processed through a consulate.
• Primary Identity Documents: Your foreign passport, birth certificate, and any previous visa records (Form I-94 arrival/departure logs) needed to verify your identity when querying federal databases.
• Financial and Processing Benchmarks: There is no direct fee to generate or search for an A-Number itself. However, the underlying petitions that trigger its creation carry filing fees ranging from $410 to over $3,000, with government processing timelines spanning from several weeks to multiple months.

Step-by-Step Retrieval of Your Alien Registration Number

If you have already engaged with the U.S. immigration system, you likely already have an A-Number assigned to your profile. Follow these detailed steps to locate, verify, and document your number across various official platforms and forms.

Step 1: Examine Your USCIS Official Notices (Form I-797)

Whenever you submit an application or petition to USCIS, they respond with a Form I-797 or Form I-797C (Notice of Action). These documents serve as receipt notices, appointment notices, or approval notices.

1. Retrieve any physical or digital Form I-797 notices associated with your pending or approved immigration cases (such as a Form I-130, I-140, or I-485 petition).
2. Look at the upper right portion of the document header. You will see a grid of administrative fields.
3. Locate the box labeled USCIS# or A#. This is your 9-digit Alien Registration Number.
4. If you see a number formatted as "A-XXX-XXX-XX" or "USCIS# XX-XXX-XXX", this is the correct digit string to use on all federal paperwork.

Pro-Tip: If the A-Number printed on your older USCIS notice contains only seven or eight digits (e.g., A-1234567), you must pad the sequence with leading zeros directly after the "A" prefix to make it a standard nine-digit identifier (e.g., A-001234567) when filling out modern online applications.

Step 2: Inspect Your Physical Green Card or Work Permit Card

If you possess a physical Permanent Resident Card (Green Card, Form I-551) or an Employment Authorization Document (EAD, Form I-766), your A-Number is printed on the face of the card.

1. Hold your card under a direct light source to clearly read the high-security text overlays.
2. Locate the field labeled USCIS#. Note that on older iterations of these cards, this field may be labeled as Client Co or simply A#.
3. Transcribe the 9-digit sequence. The format typically appears without dashes on physical cards (e.g., 012345678), but it represents the exact same identifier as an A-Number written with hyphens.

Warning: Do not confuse your A-Number with your USCIS Receipt Number. The Receipt Number is a 13-character identifier that starts with three letters (e.g., EAC, WAC, LIN, SRC, IOE) followed by ten digits. The Receipt Number tracks a specific case transaction, whereas your A-Number tracks your personhood within the immigration system.

Step 3: Extract the Number from a Consular Immigrant Visa

If you entered the United States using an immigrant visa processed at a foreign U.S. embassy or consulate, your A-Number was generated before your departure.

1. Open your passport to the page containing your physical, multi-colored U.S. visa foil.
2. Locate the text fields on the right side of the visa graphic.
3. Look for the field labeled Registration Number (often abbreviated as "Reg. No." or placed in the "Annotation" section at the bottom of the visa).
4. Identify the 9-digit number printed in this space. This number serves as your A-Number and will match the number printed on your physical Green Card once it is mailed to you.

Step 4: Access the USCIS Immigrant Fee Handout

When you complete your consular interview, the consular officer will hand you a physical document titled "USCIS Immigrant Fee Handout." This document instructs you to pay the immigrant fee online before traveling to the United States.

1. Locate the top-right corner of this printed handout.
2. Find the fields labeled Alien Registration Number (marked with an "A") and Case ID.
3. Use these two credentials to log into the USCIS online payment portal to pay your processing fee and to link your immigrant file to a digital account.

Step 5: Query the Freedom of Information Act (FOIA) Database

If you cannot locate any physical documents and have no record of your previous filings, you can request your historical immigration records directly from the federal government.

1. Access the official First (FOIA) digital request portal hosted by USCIS.
2. Create a secure account and initiate a new request under the Privacy Act.
3. Select "Form G-639, Freedom of Information Act/Privacy Act Request."
4. Input all known personal details, including your full legal name, date of birth, country of birth, parents' names, and estimated dates of entry into the United States.
5. Submit the request. USCIS will search their electronic databases and retrieve your historical A-File, which contains your original Alien Registration Number. This search process typically takes several weeks to complete.

USCIS Document Reference and Visual Data Matrix

The location and labeling of your Alien Registration Number vary depending on the specific document version and the government agency that issued it. Use the comparative matrix below to identify the exact placement of your A-Number across different forms.

Resolving Administrative Anomalies and Lost Number Protocols

Because your A-Number links your identity to your federal background checks, work permits, and travel histories, any discrepancies or access issues can halt your immigration progress. Use the following troubleshooting workflows to resolve common administrative errors.

Scenario 1: Mismatched A-Numbers Across Different Forms

• Root Cause: USCIS occasionally assigns duplicate A-Numbers if a petitioner files multiple independent applications (such as an employment-based petition and a family-based petition) without linking the cases, or if a data entry clerk makes an error during intake.
• Actionable Fix: You must request that USCIS consolidate your multiple physical and digital files into a single master A-File. Prepare a written letter detailing your full name, date of birth, and both A-Numbers. Attach copies of the conflicting Form I-797 notices. Upload this package through the secure messaging tool in your USCIS Online Account, or schedule an in-person InfoPass appointment at your local USCIS field office to merge the records.

Scenario 2: System Rejects Your Seven- or Eight-Digit A-Number

• Root Cause: Legacy systems built by DHS prior to the mid-2000s utilized shorter numeric strings. Modern digital portals, including the DS-160 consular visa form and the Electronic I-9 Employment Eligibility Verification portal, require a standardized 9-digit layout.
• Actionable Fix: Insert leading zeros immediately after the "A" prefix and before the rest of your number. For example, if your physical document reads A-7654321, you must enter it into modern online systems as 007654321. This padding satisfies the 9-digit database constraint without altering your underlying record identity.

Scenario 3: Lost Physical Cards with No Document Backups

• Root Cause: Destruction of physical cards, device failures deleting digital PDF backups, or emergency travel situations where you do not have access to your immigration records.
• Actionable Fix: If you need immediate proof of your status, schedule an emergency InfoPass appointment at a local USCIS field office. Bring your foreign passport and any secondary proof of identity (such as a U.S. driver's license or birth certificate). A USCIS officer can verify your identity and retrieve your A-Number directly from the Central Index System (CIS). Alternatively, you can request an expedited copy of your record by filing Form G-639 online.

Scenario 4: A-Number is Blank on Your Notice of Action

• Root Cause: USCIS does not issue A-Numbers to visitors, temporary workers, or nonimmigrant visa holders (such as B-1/B-2 tourists or initial H-1B visa holders) unless those individuals take specific steps to apply for permanent residence or employment authorization.
• Actionable Fix: Do not invent or input a placeholder number. If you are completing a form that asks for your A-Number and you do not have one, check the box labeled "None" or write "N/A" (Not Applicable) in the field. This will prevent processing delays caused by formatting errors.

Frequently Asked Questions

Is an Alien Registration Number the same as a USCIS Number?

Yes, the term "USCIS Number" (USCIS#) and "Alien Registration Number" (A-Number) refer to the exact same 9-digit identifier. While older green cards and paper receipts used "A-Number" or "A#", newer physical cards and online portals use "USCIS#" to denote this specific record tracking number.

Do F-1 students have an Alien Registration Number?

Initial F-1 students do not have an A-Number and are instead tracked via their SEVIS ID number. However, if an F-1 student applies for work authorization under Optional Practical Training (OPT) or STEM OPT, USCIS will assign them an A-Number, which will be printed on their Employment Authorization Document (EAD).

Can I get an A-Number without filing an immigration petition?

No, you cannot independently request or apply for an A-Number. It is exclusively generated by the Department of Homeland Security during the processing of a formal immigration benefit, such as an adjustment of status, a work authorization application, or an immigrant visa petition.

How do I find my A-Number if I applied through consular processing?

If you processed your visa at a consulate abroad, your A-Number is printed directly on your physical immigrant visa foil inside your passport under the heading "Registration Number." It is also clearly printed on the USCIS Immigrant Fee Handout you received at your consular interview.

Does my Alien Registration Number ever change?

Generally, your A-Number remains yours for life once it is assigned. Even if you change your visa status, leave the United States and return years later, or apply for new benefits, USCIS will locate your original A-File and use the same number to maintain a single continuous record.

Navigate Your Immigration Journey with Expert Legal Guidance

Verifying your Alien Registration Number is a critical step in keeping your immigration records accurate and avoiding processing delays. If you are dealing with mismatched numbers, lost records, or complex application pathways, consulting with an experienced immigration professional can help keep your case on track.