If you have a permanent resident card, you've probably noticed a series of numbers on it and wondered, "What is the alien number?" Let's break it down in simple terms. Your Alien Registration Number, often called an A-Number, is the most important number you'll have for all your interactions with U.S. immigration. Think of it as your unique account number with the government. It’s a permanent ID that links every form you fill out, every fee you pay, and every letter you receive to your personal immigration file.
Your Lifelong Immigration ID
Imagine you're applying for a Green Card, and your case involves submitting a birth certificate, marriage certificate, and financial records. Each document needs to be tied directly to you. Your A-Number is the thread that connects all these pieces together, from your very first visa application to your Green Card, and even to your naturalization ceremony if you decide to become a U.S. citizen in the future.
This isn't just a random set of digits. It's how U.S. Citizenship and Immigration Services (USCIS)—the government agency that handles immigration benefits—keeps your records organized. To understand more about this agency, you can read our overview of what U.S. Citizenship and Immigration Services does.
What Does an A-Number Look Like?
An Alien Registration Number is easy to spot. It's a 7- to 9-digit number that always starts with the letter 'A'. The U.S. government started issuing these numbers in 1940, and once you're assigned one, it's yours for life. It will never change, even when you renew your green card.
To give you an idea of how many people have one, in 2025, USCIS is projected to process hundreds of thousands of green card applications, with each successful applicant receiving their own unique A-Number. You can see more examples of where to find it on different documents by reviewing these permanent resident card details on this I-9 FAQ page).
The format is always consistent:
- Structure: It always begins with an 'A' followed by 7 to 9 numbers (for example, A123456789).
- Permanence: It is assigned to you for life and never expires or changes.
- Uniqueness: No two people ever share the same A-Number.
Alien Number (A-Number) At a Glance
For a quick reference, here are the key characteristics of your A-Number all in one place.
| Characteristic | Description |
|---|---|
| Identifier | Your primary, permanent identification number for all U.S. immigration matters. |
| Format | Starts with the letter 'A' followed by 7 to 9 numerical digits. |
| Issuing Body | U.S. Citizenship and Immigration Services (USCIS) and other immigration agencies. |
| Longevity | Assigned for life. It does not change with new applications or renewed documents. |
| Location | Found on green cards, work permits, and other USCIS-issued documents. |
This table helps summarize why this number is so critical to keep track of throughout your time in the United States.
Your A-Number is your direct line to USCIS. Always include it on your applications and correspondence to avoid delays. This is especially true when you're submitting foreign-language documents that require a certified translation for USCIS, as the number helps link everything to your file correctly.
How to Find Your Alien Number on Any Green Card
Finding your Alien Number on your Green Card can feel like a small treasure hunt, especially since the card’s design has changed over the years. The good news is that USCIS has made it much easier to spot on modern cards.
If you have a green card issued anytime after May 2010, you're in luck. Your A-Number is right on the front. Just look for the label “USCIS #”—that’s your nine-digit Alien Number. This simple change has cleared up a lot of confusion for permanent residents.
Finding the A-Number on Current and Older Cards
For anyone with a modern green card, finding your A-Number is a breeze. USCIS put it in a consistent spot so it’s always easy to reference, whether you're verifying employment or filling out official forms.
The image below shows you exactly where to look on the current Permanent Resident Card design.
As you can see, the USCIS # is clearly marked, making it simple to pull the right number for your applications.
But what if your card is older? The location can vary.
- Cards Issued Between 2004 and 2010: On these cards, the A-Number is usually labeled as “A#” and is still on the front.
- Cards Issued Before 2004: This is where it gets tricky. These older cards came in many different styles. Your A-Number could be on the front or the back, and it might not be clearly labeled. Your best bet is to scan for a nine-digit number that starts with an “A.”
Where Else Can You Find Your A-Number?
What if you can't find your green card? Don't panic. Your A-Number isn't just on that one card; it appears on several other official documents you've received from USCIS throughout your immigration process.
Your A-Number is your permanent immigration identifier. Even if your physical card is lost or expired, that number stays with you forever. It's the thread that connects your entire immigration file.
Here are a few other common places to check:
- Employment Authorization Document (EAD): If you have a work permit, your A-Number is on it, often labeled as the “USCIS #.”
- Immigrant Visa: The visa stamp in your passport that you used to enter the U.S. as an immigrant has your A-Number printed right on it.
- USCIS Notices: Every official notice you've ever received from USCIS—like a receipt notice (Form I-797C) or an approval letter—will have your A-Number on it. It’s almost always located in a box near the top of the first page.
Alien Number vs. Other USCIS Numbers
When you’re dealing with immigration paperwork, it can feel like you're drowning in a sea of official numbers. It’s incredibly easy to mix them up, and unfortunately, a simple mistake can lead to serious delays. Let’s clear up the confusion between the most common identifiers you'll encounter.
Think of your Alien Number (A-Number) as your unique immigration fingerprint. It’s the single most important number that identifies you within the U.S. immigration system. Once you get an A-Number, it’s yours for life, following you across every application and status change.
The Green Card Number, on the other hand, is specific to that physical card. It’s like the number on your credit card—when the card expires and a new one is issued, you get a new card number. Your A-Number, however, stays the same.
The Tracking Number for Your Applications
This brings us to the USCIS Receipt Number, which is where a lot of people get tripped up. This is a 13-character code that starts with three letters (like IOE, MSC, or WAC). The best way to think of it is as a package tracking number for a specific application.
Every time you file a new application or petition with USCIS, you’re assigned a new receipt number. It’s temporary and only good for tracking that one specific case, unlike your permanent A-Number.
Getting these numbers right is critical. Your A-Number (e.g., A123456789) is your lifelong personal ID. The receipt number (e.g., MSC21901234567) is just a temporary case tracker. For a deeper dive into how these numbers work on different versions of the green card, check out these insights on the Alien Registration Number.
A Real-World Example: How a Small Mistake Causes Big Delays
Let me share a story. A client, Maria, was applying to remove the conditions on her residency. While filling out the form, she accidentally wrote down her old USCIS receipt number instead of her A-Number. It seemed like a small slip-up, but it caused a major problem. USCIS couldn't match her new petition to her existing immigration file, triggering a Request for Evidence (RFE). An RFE is an official request for more information, and it put her case on hold. The process dragged on for an extra six months, all because of one wrong number.
Maria’s story is a perfect example of why this matters so much. When you're submitting documents from another country, like a birth certificate or academic transcript, they will require a certified translation for USCIS. You must ensure your A-Number is correct on all paperwork so everything gets linked to your file properly. For urgent cases, knowing the process is key; you can review our translation speed and pricing details.
Why the A-Number is Essential for Your Immigration Case
Your Alien Registration Number, or A-Number, is the single most important identifier you have in the U.S. immigration system. Think of it as the social security number for your entire immigration journey. It’s the one number USCIS uses to connect every form, every piece of evidence, and every fee payment to your specific case file. Without it, things get lost. It's that simple. Whether you’re filing a petition for a relative or adjusting your status, your A-Number is the first thing an officer looks for.
Why the A-Number Is Crucial for Translated Documents
This number becomes absolutely critical when you're submitting documents that aren't in English. For example, let's say you're providing a foreign marriage certificate to prove your relationship. USCIS requires that document to be submitted with a certified translation. This is a complete and accurate translation of the original document, accompanied by a signed letter from the translator or translation company attesting to its accuracy.
To avoid any mix-ups, your A-Number should be clearly referenced on all your supporting paperwork, including the certification statement that comes with your translated document. This creates a direct, unmistakable link between the translation and your main application file, leaving no room for guesswork on the part of the USCIS officer. A missing A-Number is one of the fastest ways to get a Request for Evidence (RFE), which can stall your case for months.
A Cautionary Tale: Accuracy vs. Delays
I’ve seen this happen more times than I can count. A client was applying for citizenship and needed to submit his birth certificate from his home country. To save a few dollars, he used a cheap online service that provided a translation but didn't include a proper certification statement or, more importantly, a place to reference his A-Number.
When the package arrived at USCIS, the officer had no quick way to connect that translated birth certificate to his main application. The result? His case was put on hold for six long months while USCIS issued an RFE. He had to start over and get a new, properly prepared certified translation. Getting every detail right from the beginning isn't just about following rules; it's about saving yourself time, money, and a lot of stress. You can see the official standards for yourself by reviewing the USCIS translation requirements.
When Will You Need Your Alien Number?
Think of your A-Number as more than just a string of digits on a card. It's the central identifier that connects you to nearly every important government process in the United States. Once you have it, you'll find it's the key that unlocks major milestones in your new life here. From getting your first job to eventually applying for citizenship, this number is how different agencies verify who you are and confirm your legal status.
A Practical Checklist for Using Your A-Number
So, where will this number pop up? Here’s a quick rundown of the most common situations where you'll need your A-Number ready.
Starting a New Job (Form I-9): When you're hired, your employer is required to complete Form I-9 to verify your identity and authorization to work. As a permanent resident, your A-Number is a mandatory piece of information for this form.
Applying for a Social Security Number (SSN): Before the Social Security Administration can issue you an SSN, they'll use your A-Number to cross-reference your immigration status with USCIS.
Getting a Driver's License or State ID: Headed to the DMV? They will ask for your A-Number to confirm you are lawfully present in the country before issuing you any state identification.
Tracking USCIS Applications: If you have any pending petitions or applications, you can often use your A-Number to check the case status online through the official USCIS portal.
An Expert Tip: One of the most common and frustrating mistakes we see is with formatting. Most online government systems require a 9-digit A-Number. If your number has only 7 or 8 digits, you must add zeros at the beginning (for example, A1234567 becomes A001234567). Forgetting this simple step can cause system errors and unnecessary delays.
Your A-Number is the standard for long-term immigrants, including green card holders and DACA recipients. As you get settled and look toward the future, keeping all your documents organized becomes even more important. This is especially true when you begin gathering the required documents for a citizenship application.
Common Questions About Your Alien Number
As you move through the immigration system, a few key questions tend to pop up again and again. Let's tackle some of the most common ones so you can feel confident handling your paperwork.
What Happens to My Alien Number If I Lose My Green Card?
Don't worry—your A-Number is for life. Think of it like your Social Security Number; it’s a permanent identifier assigned only to you.
Even if you lose your physical green card, have it stolen, or it expires, your A-Number stays exactly the same. The replacement card you receive will have a new card number on it, but your core immigration identifier, the A-Number, remains constant.
Do I Get an Alien Number with a Temporary Visa?
Not usually. People visiting on temporary, non-immigrant visas—like tourists (B-2) or students (F-1)—are not typically given an A-Number.
An A-Number is generally created for you when you take the first steps toward becoming a permanent resident (getting a green card) or apply for other long-term immigration statuses.
Is It Possible for My Alien Number to Change?
In almost every case, no. Your A-Number is the one constant USCIS uses to link your entire immigration file together from start to finish.
The only time this might happen is in the very rare situation where a clerical error leads to two different numbers being assigned to you. In that case, USCIS would have to step in to merge your files under a single, correct A-Number. But for 99.9% of people, it's set in stone.
What if I Need to Translate Foreign Documents for USCIS?
This is a big one. When you submit official documents from your home country, like civil certificates (birth or marriage certificates), USCIS insists on a certified translation. This isn't just the translated text; it must be accompanied by a signed statement from the translator or translation company certifying that the translation is both complete and accurate.
Crucial Tip: Always make sure the certificate of translation references your A-Number. This creates a solid, unbreakable link between the translated document and your main application file, which is your best defense against processing delays or a dreaded Request for Evidence (RFE).
Getting this small detail right from the beginning can save you a world of headaches down the road. Using a professional service ensures every translation is properly formatted and certified to meet USCIS standards.
Need to submit foreign documents to USCIS? Don't risk delays. Request a certified translation for USCIS today and ensure your application keeps moving forward.
