Numbers & Documents
Green Card Number: Which Number Is It, and Where Do You Find It?
"What's my green card number?" sounds like a simple question, but it has more than one right answer depending on context. A green card prints several identifiers, and the term "green card number" gets used loosely for at least three of them.
This guide gives you a clear decision rule: figure out who is asking and why, and the right number becomes obvious. We'll cover the card number, the USCIS#/A-Number, and how to tell them apart at a glance.
By the end you'll be able to look at your card—or a form—and know exactly which number belongs where.
Key takeaways
- ✓"Green card number" can refer to the card number, the USCIS#, or the A-Number.
- ✓The card number (back of card) identifies the physical card and changes with each issuance.
- ✓The USCIS#/A-Number (front) identifies you and never changes.
- ✓Document verification wants the card number; immigration filings want the A-Number.
- ✓When unlabeled, the nine-digit USCIS#/A-Number is the safer default for USCIS forms.
The three numbers people call a "green card number"
First, the card number: a 13-character serial (commonly three letters and ten digits) printed on the back of a current card. It identifies the physical card and changes whenever you get a new one.
Second, the USCIS#, which is your nine-digit A-Number shown on the front. This identifies you and never changes, no matter how many cards you're issued.
Third, in casual conversation people sometimes say "green card number" when they actually mean their A-Number. Because the front of the card labels that nine-digit value as "USCIS#," it's the one most immigration forms care about.
A simple rule for picking the right one
Ask what the requester is trying to do. If they are verifying the physical document—an employer completing Form I-9, or a border officer—they typically want the card number and expiration date. If they are connecting you to your immigration record—almost any USCIS application—they want your A-Number/USCIS#.
When a form spells out "Alien Registration Number" or "USCIS#," use the nine-digit number. When it says "card number" or "document number," use the 13-character serial from the back.
If a form just says "green card number" with no further label, the nine-digit USCIS#/A-Number is the safer default for immigration purposes—but read the surrounding instructions, which usually clarify.
Protecting and recording your numbers
Your green card numbers link to your identity and immigration history, so treat them as sensitive. Keep a photocopy or secure photo of both sides of the card somewhere safe, separate from the card itself.
If your card is lost or stolen, having the numbers recorded makes filing Form I-90 for a replacement far smoother, and it helps if you need to report the loss.
When we prepare any filing that references your green card, we transcribe each number directly from your card and confirm it field by field—because a single transposed digit can stall an otherwise perfect packet.
Verify the official details
Government fees, processing times, form editions, and rules change regularly. Before you rely on any figure, confirm the current information on the official government page.
Learn more about green cards on USCIS.govFrequently asked questions
What is my green card number?+
It depends on context. The 13-character serial on the back is the card number; the nine-digit "USCIS#" on the front is your A-Number. Immigration forms usually want the A-Number; document verification usually wants the card number.
Is the USCIS# the same as the A-Number?+
Yes. On current cards, the "USCIS#" on the front is your A-Number printed without the "A" prefix.
Which number changes when I renew my card?+
The card number changes with each new physical card. The USCIS#/A-Number stays the same for life.
A form just says "green card number." Which do I use?+
Read the surrounding instructions; they usually clarify. For USCIS immigration forms, the nine-digit USCIS#/A-Number is the safer default when no other label is given.
Where is each number on the card?+
The USCIS#/A-Number is on the front with your name and photo; the 13-character card number is on the back near the machine-readable zone.
What should I do if I can't read a digit on my worn card?+
Cross-check against your other immigration documents, which list your A-Number. If the physical card is damaged, you may need Form I-90 to replace it.
Related resources
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Asal Immigration Services is a document preparation service operated by Asal Multi-Services LLC. We are not attorneys and are not authorized to practice law. We do not provide legal advice, explanations, opinions, or recommendations about legal rights, remedies, defenses, options, or strategies. We assist with the preparation of immigration forms based on information you provide. For legal advice, consult a licensed immigration attorney.