Welcome to this comprehensive guide on the Alien Registration Number, also known as the A-number. This unique identification number is assigned to non-citizens by the [U.S. government](https://travel.state.gov/content/travel/en/us-visas/immigrate/the-immigrant-visa-process/step-1-submit-a-petition.html^) and plays a crucial role in the immigration process. 

The purpose of this article is to educate you about what an A-number is, who gets it, when and where you can find it, and how it differs from [USCIS case number](/immigration-resources/uscis-processing-times-guide)s. Whether you're a non-U.S. citizen applying for a green card or other immigration benefits, an [immigration lawyer](/immigration-resources/immigration-parole-guide), advisor, or simply someone interested in understanding the U.S. immigration system, this guide is for you.

In the following sections, we will delve into the specifics of the A-number, its assignment process, and its presence on various immigration documents. We will also address some frequently asked questions about the A-number. By the end of this article, you should have a clear understanding of the A-number and its significance in the U.S. immigration process. Let's get started.

The Alien Registration Number, or A-number, is a unique seven to nine-digit number assigned by the U.S. government to non-citizens. This number serves as a key identifier in your immigration journey, helping the U.S. Citizenship and Immigration Services (USCIS) track your case and keep your records organized.

If you're applying for a green card or other immigration benefits, you will be assigned an A-number. This includes immigrants who are applying based on family ties, employment, or other eligibility criteria. However, if you're in the U.S. on a temporary basis, such as on a business or tourist visa, you typically will not receive an A-number. 

There is an exception to this rule. If you're on an F-1 student visa and have received work authorization, you will be assigned an A-number. This is because the work authorization moves you from a temporary status to a more permanent one, necessitating the assignment of an A-number.

It's important to note that the A-number is different from the USCIS case number. While the A-number is a unique identifier for you as an individual, the USCIS case number is used to track specific applications. This means that your A-number will remain the same even if you apply for different immigration benefits at different times, but each application you submit will have a different USCIS case number. Understanding this distinction can help you navigate the immigration process more effectively.

As we've mentioned, the A-number is assigned to every immigrant who applies for a green card, regardless of their eligibility criteria. This means that whether you're applying for a green card based on family ties, employment, or other reasons, you will be assigned an A-number.

However, if you're in the U.S. on a temporary basis, such as on a business or tourist visa, you typically will not receive an A-number. This is because these types of visas are meant for short-term stays and do not lead to permanent residency.

It's important to understand these distinctions to know whether you should expect to receive an A-number as part of your immigration process. If you're unsure, it's always a good idea to consult with an immigration professional.

The A-number is usually assigned when you apply for a green card. This means that as soon as you submit your [green card application](/immigration-resources/green-card-immigration-guide), you can expect to receive your A-number.

However, the A-number can also be assigned to those who have previously gained work authorization while on an F-1 student visa. In this case, the A-number is assigned when the work authorization is granted.

If you're applying for a marriage green card from within the U.S., the A-number is included on the receipt notice from USCIS after filing the green card application form. This receipt notice is an important document that confirms USCIS has received your application and is processing it.

For those applying for a green card from outside the U.S., the A-number is assigned during the [consular interview](/immigration-resources/us-visa-interview-process) at the U.S. consulate. This is a key step in the green card application process for those applying from abroad, and the A-number is a crucial part of this process.

Remember, the A-number is a unique identifier that will stay with you throughout your immigration journey. It's important to keep track of it and include it in all correspondence with USCIS.

Your A-number can be found on all documents sent by USCIS. This includes the green card application receipt notice, approval notices, and all other correspondence. It's typically labeled as "A#" or "USCIS#" on these documents.

It's crucial to understand that the A-number is different from the USCIS case number. The USCIS case number is used to track specific applications. Each application you submit will have a different USCIS case number. However, your A-number remains the same for you as an individual, even if you apply for different immigration benefits at different times.

Knowing where to find your A-number is essential for your immigration process. It's the key identifier that USCIS uses to track your case and keep your records organized. Always make sure to include it in all correspondence with USCIS and keep it safe for future reference.

Frequently Asked Questions about the A-Number

Understanding the Alien Registration Number, or A-number, is a crucial part of navigating the U.S. immigration process. This unique identifier is assigned to non-citizens who apply for a green card or other immigration benefits, and it plays a key role in tracking your case and keeping your records organized.

Remember, your A-number is typically assigned when you apply for a green card or gain work authorization on an F-1 student visa. It can be found on all documents sent by USCIS, and it's different from the USCIS case number, which is used to track specific applications.

We hope this guide has helped clarify what the A-number is, who gets it, when and where it's assigned, and how it differs from other identifiers. As you continue your immigration journey, keep this information in mind and refer back to it as needed.

If you have more questions or need further assistance, don't hesitate to consult with an immigration professional. They can provide expert guidance and help ensure you're on the right track. Good luck with your immigration process!

The Alien Registration Number, or A-Number, is a unique ID assigned by the U.S. government to non-citizens for tracking immigration cases and maintaining records. It is used in applications for green cards and other immigration benefits. It differs from the USCIS case number and remains constant throughout your immigration process. It should be included in all USCIS correspondence and kept secure.

Alien Registration Number (A-Number): A Guide for Non-Citizens

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