This article was last updated and fact checked on April 28, 2025 by Mani Karthik.
Ever been asked for your “green card number” on a form or application and spent 15 minutes examining your card wondering which of the many numbers is the right one?
I had this same frustrating experience when applying for my driver’s license after getting my green card.
After years of helping family members navigate their green card journeys, I can tell you exactly where to find your green card number, what it means, and when you’ll need to use it for various services and applications in the United States.
In this article...
Quick Overview: What Is a Green Card Number?
A green card number (or USCIS number) is a 13 digit identifier found on your permanent resident card. It starts with three letters followed by 10 numbers.
This unique identifier is different from your A-Number and is used specifically to identify your physical green card rather than your immigration file.
Different from your Alien Registration Number (A-Number), the green card number is primarily used when you need to replace a lost, stolen, or expired card, while the A-Number is used for most immigration processes.
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Where to Find Your Green Card Number
Your green card contains several different numbers, which can be confusing. Here’s exactly where to find your green card number:
- Look at the front of your permanent resident card
- Find the 13 character identifier at the top right corner
- It starts with three letters (typically C1 or C2) followed by 10 numbers
- Example format: C1X1234567890
💡 Pro Tip: Take a clear photo of both sides of your green card and store it securely in your phone or password protected cloud storage. While this digital copy isn’t legally valid for identification, it provides quick access to all your important numbers when filling out forms or applications.
Green Card Number vs. A-Number: Know the Difference
Many people confuse these two important numbers:
Green Card Number (USCIS Number)
- 13 characters (3 letters + 10 numbers)
- Located at the top right corner of the card front
- Identifies the physical card itself
- Used primarily for card replacement requests
A-Number (Alien Registration Number)
- 8 or 9 digits with leading zero if 8 digits
- Preceded by “A” on the card (e.g., A012 345 678)
- Located on the back of newer cards
- Your permanent identifier in the immigration system
- Used for most USCIS forms and processes
| Number Type | Format | Location on Card | Main Purpose |
|---|---|---|---|
| Green Card Number | 3 letters + 10 digits | Front, top right | Card identification |
| A-Number | 8 or 9 digits | Back of card | Immigration file ID |
| Card Expiration Date | MM/DD/YYYY | Front of card | Renewal timing |
When You’ll Need to Use Your Green Card Number
You’ll need your green card number in these specific situations:
1. Replacing a Lost or Stolen Card
- Required on Form I-90 when requesting a replacement
- Helps USCIS identify which card needs replacement
- Links the replacement request to your original card
2. Renewing an Expiring Green Card
- Needed on renewal applications
- Verifies the card that needs renewal
- Helps process your new card more efficiently
3. Card Related USCIS Inquiries
- When checking status of card production
- For case inquiries about your physical card
- When reporting card errors or problems
4. Certain Government Services
- Some government agencies may request this number
- Some financial institutions may ask for it
- Certain employment verification systems might request it
When to Use Your A-Number Instead
For most immigration matters, you’ll actually need your A-Number, not your green card number:
- Filing most USCIS forms (adjustment of status, naturalization, etc.)
- Communication with USCIS about your case
- Checking case status online
- Employment eligibility verification (Form I-9)
- Tax filings with the IRS
The History and Evolution of Green Cards
Over the years, green cards have undergone several design changes:
- Pre 2004: The older style green cards (Resident Alien Cards)
- 2004 to 2010: Permanent Resident Cards with some security features
- 2010 to 2017: Enhanced security features and changed card material
- 2017 to Present: Current version with advanced security features
With each redesign, the location of numbers may have shifted slightly, but the core identifiers remain consistent.
Common Mistakes People Make With Green Card Numbers
1. Confusing the Green Card Number with the A-Number
These are completely different identifiers with different purposes. Using the wrong number on forms can cause processing delays.
2. Forgetting to Update Records After Receiving a New Card
When you renew or replace your green card, you receive a new green card number, though your A-Number stays the same. Update your records accordingly.
3. Not Securing This Sensitive Information
Your green card number is a sensitive identifier that should be protected from identity theft. Don’t share it unnecessarily or keep unsecured photos of your card.
4. Using Expired Green Card Numbers
An expired green card number is no longer valid for identification purposes, even though your permanent resident status continues.
FAQs About Green Card Numbers
Is my green card number the same as my A-Number?
No, they are different. Your green card number is a 13 character identifier specific to your physical card, while your A-Number (Alien Registration Number) is your permanent identifier in the immigration system. The A-Number stays with you even when you get a new green card.
Does my green card number change when I renew my card?
Yes, you’ll receive a new green card number when you renew or replace your card. However, your A-Number remains the same throughout your immigration journey, even after naturalization.
Can I find my green card number on any other documents?
Typically, your green card number appears only on the physical card itself. It’s not usually included on USCIS notices or approval letters. This is why keeping a secure copy of your card information is important.
What should I do if I can’t read my green card number?
If your card is damaged making the number illegible, you should file Form I-90 to replace your card. You may need to provide additional documentation since you cannot provide the original green card number.
Is the green card number needed for traveling internationally?
When traveling, you’ll present your physical green card, so the number itself isn’t something you need to memorize for travel purposes. However, having a secure digital copy of your card with the number visible can be helpful if your card is lost while traveling.
Bonus Tips for Green Card Holders
Create a secure document with all your important numbers. Include your green card number, A-Number, card expiration date, and USCIS receipt numbers from your immigration journey.
Set calendar reminders for renewal. Green cards are typically valid for 10 years (or 2 years for conditional residents). Set a reminder 6 months before expiration to begin the renewal process.
Check your green card status online. Visit USCIS Case Status Online and enter your receipt number to track your green card application or renewal.
Update your address with USCIS when you move. Green card holders are legally required to report address changes within 10 days of moving by filing Form AR-11.
💡 Pro Tip: If you become eligible for naturalization, consider applying for US citizenship before renewing an expiring green card if timing permits. The naturalization application fee is higher than green card renewal, but becoming a citizen eliminates the need for future green card renewals and provides additional benefits like voting rights and protection from deportation.
Key Takeaways About Green Card Numbers
- Your green card number is a 13 character identifier on the front of your card
- It’s different from your A-Number, which is your permanent immigration identifier
- The green card number primarily identifies the physical card itself
- You’ll need it mainly for card replacement or renewal
- For most USCIS processes, you’ll use your A-Number instead
- Protect this sensitive information to prevent identity theft
- Keep a secure record of all your immigration numbers
Understanding the different numbers on your green card helps you navigate various systems in the US more efficiently.
While it might seem confusing at first, knowing which number to use when will save you time and prevent frustration with applications and forms.
I hope this guide helps clarify the sometimes confusing world of green card numbers! Having this knowledge makes your life as a permanent resident smoother and helps you focus on building your new life in the United States.
Wishing you a wonderful journey as a permanent resident! ✈️
