Show pageBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ====== Alien Registration Number (A-Number): The Ultimate Guide to Your Federal ID ====== **LEGAL DISCLAIMER:** This article provides general, informational content for educational purposes only. It is not a substitute for specialized legal counsel from a certified immigration attorney. If you discover that the United States government has accidentally assigned you *two* different A-Numbers, you must urgently contact an immigration lawyer to file an A-File Consolidation request. Possessing multiple active A-Numbers during an `[[adjustment_of_status_aos|Adjustment of Status]]` application will confuse the federal databases and heavily delay or critically detonate your Green Card approval. ===== What is an Alien Registration Number? A 30-Second Summary ===== If you are a native-born American citizen, the U.S. government tracks your entire financial, criminal, and legal existence via a 9-digit Social Security Number (SSN). However, if you are a foreign national navigating the highly treacherous U.S. immigration system, you are assigned a completely different, infinitely more critical federal identifier: the **Alien Registration Number (A-Number)**. * **The Federal Barcode:** The A-Number (often widely referred to as an "A#", "Alien Number", or "USCIS Number") is a unique 7, 8, or 9-digit numerical identifier assigned to a non-citizen by the Department of Homeland Security (DHS). * **The Physical Identity:** This number is not just a digital ID; it corresponds to a massive, physical red manila folder sitting in a highly secured federal warehouse called your **"A-File."** Every single visa application you have ever filed, every background check, every marriage certificate, and every `[[enforcement_and_removal_operations_ero|deportation order]]` associated with your entire life is physically stapled into that single file. * **The Permanence:** In most cases, exactly like a Social Security Number, your A-Number is permanently yours for the rest of your life. If you secure a Green Card, the number is physically etched onto the plastic. If you eventually reach the summit of immigration and become a naturalized U.S. Citizen, that exact A-Number is permanently printed on your Certificate of Naturalization and then securely archived in history. ===== Part 1: Who Actually Gets an A-Number? (Not Everyone) ===== A massive misconception among foreigners is the belief that crossing the U.S. border automatically generates an A-Number. That is legally false. If you enter the U.S. on a standard B-1/B-2 Tourist Visa for a three-week vacation to Disney World, the U.S. government does *not* assign you an A-Number. If you enter on a 4-year F-1 Student Visa to study at Harvard, you generally do *not* automatically receive an A-Number simply for sitting in class. You are only assigned an A-Number when you trigger a massive, permanent federal immigration action. ==== Trigger 1: The Green Card Application ==== The most common and safest way to receive an A-Number is by filing massive federal paperwork intended for permanent residency. * The exact minute an immigrant files **Form I-485** (`[[adjustment_of_status_aos|Adjustment of Status]]`) or an immigrant `[[i-140|I-140 Petition]]` with USCIS, the government generates a physical A-File, prints a 9-digit A-Number on the I-797 Receipt Notice, and formally inserts the immigrant into the permanent system. ==== Trigger 2: The Work Permit (EAD) ==== If an F-1 College student applies for Optional Practical Training (OPT) to work in the U.S. for a year after graduation, they must file Form I-765 for an Employment Authorization Document (EAD). * USCIS will assign the student a unique A-Number printed specifically on that EAD work card, allowing employers to verify their status. ==== Trigger 3: The Nightmare (The Deportation Trigger) ==== This is the terrifying way to receive an A-Number. * If an undocumented immigrant crosses the southern border illegally and is instantly tackled by Border Patrol, or if a tourist overstays their visa by 4 years and is arrested by `[[enforcement_and_removal_operations_ero|ICE ERO]]` during a workplace raid, DHS immediately generates an A-Number. * That brand-new A-Number is heavily printed in red ink at the top of the **Notice to Appear (NTA)**—the lethal charging document that formally places the immigrant into federal deportation proceedings in front of an Immigration Judge. ===== Part 2: Where to Hunt for Your A-Number ===== If you are filling out federal immigration paperwork, leaving the A-Number box blank (if you safely have one) will cause USCIS to mercilessly reject the form. Because it is printed on wildly different documents over the span of a 10-year immigration journey, it can be confusing to find. Always look for a 7, 8, or 9-digit number. (If the number only has 7 or 8 digits, USCIS explicitly demands that you put one or two "Zeros" before the first number so it technically equals a 9-digit format, e.g., A012-345-678). ==== 1. On a Modern Green Card ==== If you are a `[[lawful_permanent_resident|Permanent Resident]]`, look directly at the physical plastic card. * On cards issued after 2010, the U.S. government completely removed the terrifying word "Alien." It is prominently printed on the front of the card under the label **"USCIS #"**. It will be a 9-digit number formatted as XXX-XXX-XXX. ==== 2. On an EAD (Work Permit) Card ==== If you hold a plastic Employment Authorization Document, look at the front of the card. Below your birthdate, it is labeled **"USCIS #"**. ==== 3. On the I-797 Notice of Action ==== Whenever you mail massive applications to USCIS, they reply via the physical mail with a critical piece of green paper called an I-797 Receipt Notice. * Look at the extreme top right-hand corner of the paper. Next to "USCIS Alien Number," it will clearly list the A-Number generated specifically for your case. ==== 4. On a physical Immigrant Visa ==== If you survived Consular Processing in your home country, the U.S. Embassy physically glued a massive, colorful Visa foil into your passport. * Look at the top right portion of the visa foil. It will be clearly marked as the "Registration Number." ===== Part 3: The Ghost Numbers (The Receipt Trap) ===== There is a massive, highly technical trap surrounding A-Numbers involving USCIS Receipt numbers. When USCIS generates a physical I-797 Receipt Notice, the paper also contains a 13-character **Receipt Number** (e.g., LIN-22-123-45678 or WAC-19-876-54321). This is *not* an A-Number. This is simply the tracking number for that one single piece of mail, much like a FedEx tracking code. However, USCIS sometimes generates temporary, internal tracking numbers that highly resemble A-Numbers (often starting with a 9). If you attempt to use this temporary placeholder code as your actual formal A-Number on a future Green Card application, you will violently confuse the federal database and delay your background checks for months. ===== Part 4: The A-File (The Master Federal Dossier) ===== Your A-Number is the singular key used by lawyers to unlock exactly what the `[[u.s._attorney's_office|Federal Government]]` secretly knows about you. Because the A-File contains a 30-year physical history of your life, an immigrant can forget what lies they told to a border agent back in 1999. If that immigrant applies for a Green Card today and contradicts those 1999 lies during an interview, the `[[uscis_officer|USCIS Officer]]` will pull the physical A-File from the warehouse, catch the discrepancy, and deny the case for permanent fraud. ==== The FOIA Hack ==== To prevent this catastrophe, intelligent immigration lawyers will never file a Green Card application without first checking the A-File. * The lawyer will execute a **Freedom of Information Act (FOIA)** request specifically demanding a complete, unredacted digital copy of the immigrant's entire A-File, using only the A-Number as the search identifier. * Months later, the government returns a 500-page PDF containing every single border crossing, every forgotten arrest report, and every handwritten note left by previous federal adjudicators, allowing the lawyer to safely build an impenetrable legal defense strategy. ===== Glossary of Related Terms ===== * **[[adjustment_of_status_aos]]:** (Form I-485) The most secure, idealized federal process that legally forces the U.S. government to formally generate an A-File and permanently assign you a 9-digit Alien Registration Number. * **[[uscis_officer]]:** The federal adjudicator whose entire legal decision-making process revolves around meticulously pulling and reading the physical Manila-folder A-File connected to your identity. * **[[enforcement_and_removal_operations_ero]]:** The heavily armed DHS deportation agents who violently utilize the A-Number database to digitally track your geographical movements and execute the actual physical deportation warrant. ===== See Also ===== * [[adjustment_of_status_aos]] * [[uscis_officer]] * [[enforcement_and_removal_operations_ero]]