The US Alien Registration Number, commonly known as the A-number, is a unique identifier assigned by U.S. Citizenship and Immigration Services (USCIS) or the U.S. Department of Justice for non-citizens. This number helps federal agencies track immigration records, applications, and benefits. Understanding the A-number can simplify interactions with immigration processes, from visa applications to naturalization. The A-number is not the same as a Social Security Number (SSN), though both may appear on immigration documents.
This article explains what an A-number is, how it is used, who receives one, where to find it, and how it differs from other identifiers. It also covers common questions about obtaining or locating an A-number and its relevance in everyday immigration tasks.
What Is An Alien Registration Number
An Alien Registration Number, or A-number, is a unique 7-9 digit identifier assigned to non-citizens during various immigration proceedings. It appears on official documents such as Form I-94, Form I-551, and any entry or asylum records. In some cases, the A-number is written with a leading “A” (for example, A123456789). The A-number stays with an individual through multiple immigration actions and is used to retrieve a person’s records across federal systems.
Typical Uses Of The A-Number
The A-number is used to manage and retrieve immigration records across agencies. It appears on petitions, applications, and notices involved in:
- Visa applications and petitions (nonimmigrant and immigrant pathways)
- Adjustment of status and naturalization processing
- Asylum and refugee determinations
- Removal proceedings and detention records
- Work authorization and benefits linked to immigration status
Administratively, the A-number helps officials locate a person’s entire immigration history, including prior entries, visas, changes in status, and any enforcement actions. For applicants, referencing the A-number ensures that documents and records are correctly linked to their file.
Who Receives An A-Number
Most non-citizens engaging with U.S. immigration processes receive an A-number. Typical scenarios include:
- Applicants for asylum, refugee status, or other protection
- Individuals applying for adjustment of status to lawful permanent residency
- People pursuing family- or employment-based immigration petitions
- Individuals who are placed in removal proceedings or are subject to immigration court actions
- Beneficiaries of certain petitions where USCIS or DOJ assigns an internal case file number
Citizens and some noncitizens may not receive an A-number unless they enter a process that requires formal immigration records. The A-number is intended to centralize an individual’s immigration history.
Where The A-Number Appears
The A-number can appear on several documents and records, including:
- Form I-94 and I-94 arrival/departure records
- Form I-485 (Application to Register Permanent Residence or Adjust Status)
- Form I-130, I-140, and related petitions
- Naturalization forms and related notices from USCIS
- Asylum applications and related orders
It may also be listed in electronic records within USCIS, CBP, ICE, and EOIR databases. When communicating with immigration authorities, including support staff or attorneys, the A-number is often the fastest way to locate a person’s case file.
How The A-Number Differs From An SSN
Two identifiers commonly appear on immigration documents but serve different purposes. The A-number is a noncitizen-specific file reference used by immigration agencies to track legal status, petitions, and enforcement actions. The SSN is issued by the Social Security Administration and is used for employment, taxation, and general identification within the U.S. economy.
Key distinctions include:
- Purpose: A-number tracks immigration history; SSN tracks work and benefits eligibility.
- Scope: A-number is tied to immigration records; SSN is tied to social programs and taxes.
- Format: A-numbers are typically 7-9 digits (often with a leading A); SSNs are 9-digit numbers formatted as XXX-XX-XXXX.
Confusion can arise because both numbers may appear on immigration documents, but they serve different roles in government records and practical use.
How To Find Or Obtain An A-Number
For most individuals, the A-number is assigned during an immigration process and appears on official notices. If the A-number is not readily available, consider these steps:
- Check official notices: asylum decisions, visa approvals, or adjustment of status letters typically display the A-number.
- Review electronic accounts: many applicants can log into their USCIS online account to view case details, including the A-number.
- Ask the attorney or accredited representative: legal counsel who handles the case can locate and confirm the A-number.
- Contact relevant agencies: USCIS, EOIR, or CBP can verify a case file if proper identification and authorization are provided.
For individuals who never entered an immigration process, an A-number may not exist, and there would be no such identifier in federal records.
Frequently Asked Questions
Do U.S. citizens have an A-number? Typically no. A-numbers are assigned to non-citizens involved in immigration matters. Some dual-use cases or transitional records may appear in unusual scenarios, but citizens generally do not receive an A-number.
Can an A-number change? In most cases, the A-number remains constant for a person’s immigration history. It is not reassigned after creation, even if the individual changes status or petitions multiple times.
Is the A-number the same as a visa number? No. A-numbers are internal case identifiers; visa numbers refer to issued documents like immigrant or nonimmigrant visas. They serve different purposes in the immigration process.
Is the A-number required for family-based petitions? Yes, the A-number is often used to link family-based petitions to an applicant’s case file across agencies and stages of processing.
Practical Tips For Using The A-Number
To minimize delays or errors during immigration proceedings, consider these practices:
- Always include the A-number when communicating about a case with USCIS, EOIR, or CBP.
- Store a secure copy of documents displaying the A-number for quick reference.
- Verify the A-number on all notices to ensure it matches the case file.
- When working with legal counsel, provide the A-number upfront to streamline file retrieval.
Understanding where the A-number appears and how it is used helps applicants navigate complex immigration workflows with greater confidence and accuracy.