Your Permanent Resident Card number is the 13-character code printed on the back of your Green Card, inside the machine-readable zone. It’s three letters followed by ten digits, and it identifies that specific physical card. The number on the front labeled “USCIS#” is something else — your Alien Registration Number — which is why so many people copy the wrong string onto a form.
Where the Card Number Sits on the Card
Turn the card over. The back carries two or three lines of tightly packed characters that make up the machine-readable zone. Your card number lives inside the first line: three letters (common prefixes include MSC, EAC, WAC, LIN, SRC, NBC, and IOE) followed by ten digits.1U.S. Citizenship and Immigration Services. Receipt Number Nothing on the card labels it “Card Number,” so you have to count into the string to isolate it. On cards issued since May 2010, the 13 characters typically occupy positions 16 through 28 of that first line.
The front of the card shows your photo, name, date of birth, country of birth, and a field marked “USCIS#.” That USCIS# is not your card number. It’s your A-Number, and the two do very different jobs.
Card Number vs. A-Number vs. Receipt Number
Your Green Card carries at least two distinct numbers, and a third number from USCIS may show up on your application paperwork. Mixing them up is the fastest way to delay a filing.
- Card number (document number). The 13-character code on the back. It identifies the physical card, so a replacement card gets a new card number.
- Alien Registration Number (A-Number). A unique number, usually eight or nine digits, preceded by “A.” It appears on the front under “USCIS#” and also on the back. It stays with you for life, no matter how many times your card is renewed or replaced. The “USCIS Number” on cards issued after May 10, 2010, is the same value as your A-Number.2U.S. Citizenship and Immigration Services. A-Number/Alien Registration Number/Alien Number (A-Number or A#)3U.S. Citizenship and Immigration Services. USCIS Number
- Receipt number. A 13-character identifier USCIS assigns to every application or petition it accepts. It uses the same three-letters-plus-ten-digits format as the card number, which is where much of the confusion starts. You’ll find it on Form I-797C, Notice of Action, and in your USCIS online account. It tracks a case, not a card. Same format, different value.1U.S. Citizenship and Immigration Services. Receipt Number
The short rule: when a form asks for your “Permanent Resident Card number,” “document number,” or “card number,” it wants the 13 characters from the back. When it asks for your A-Number, USCIS number, or Alien Registration Number, it wants the number from the front.
Which Number Common Forms Actually Want
A few situations trip people up regularly.
Form I-9 (employment verification). If you use your Green Card as proof of identity and work authorization, Section 1 asks for your USCIS number or A-Number, not the card number.4U.S. Citizenship and Immigration Services. Form I-9, Employment Eligibility Verification Your employer records details from the card itself in Section 2.
Form N-400 (naturalization) and Form I-130 (family petitions). These forms ask for your A-Number and generally require a photocopy of both sides of your Green Card, which is how the card number ends up in the file.5U.S. Citizenship and Immigration Services. M-477 Document Checklist
Social Security updates. After you receive your Green Card, you can update your status with the Social Security Administration by applying for a replacement Social Security card and bringing proof of identity and new status to your appointment.6Social Security Administration. Update Citizenship or Immigration Status
REAL ID and state driver’s licenses. A valid, unexpired Green Card satisfies the lawful status requirement for a REAL ID-compliant license, and the DMV verifies your information through the federal SAVE system.7Transportation Security Administration. REAL ID Frequently Asked Questions
Reentry to the United States. At the border, lawful permanent residents present the Green Card or a Reentry Permit; the officer reads the machine-readable zone directly.8U.S. Customs and Border Protection. Documents Needed for Lawful Permanent Residents (LPR)/Green Card Holders
Read the form instructions carefully before you fill in a field. Using the receipt number where the card number belongs, or the A-Number where the card number belongs, is the kind of mistake that draws a Request for Evidence and adds weeks to a case.
Finding the Number Without the Physical Card
If your card isn’t in front of you, a few backup routes can produce the number.
Check any photocopy of the card you kept with previous filings. If you copied both sides when you filed an earlier application, the card number is visible on the back-side scan.
Log in to your USCIS online account at my.uscis.gov. The account holds case updates, receipt numbers, and electronic copies of applications you filed online.9U.S. Citizenship and Immigration Services. Checking Your Case Status Online You can also check case status at egov.uscis.gov using a receipt number.10U.S. Citizenship and Immigration Services. Case Status Online – Case Status Search The account itself won’t display your card number, but it helps you gather what you need to contact USCIS.
Look at old Form I-797C notices. Any notice you received when USCIS accepted an application carries a receipt number. That receipt number isn’t your card number, but it lets you track your case and gives USCIS a reference point when you call.
Ask the attorney or accredited representative who handled a past case. If they filed anything on your behalf that required the card, they likely kept a copy.
If the Card Is Lost, Stolen, or Expired
If none of the backup methods work and you actually need the card itself replaced, file Form I-90, Application to Replace Permanent Resident Card.11U.S. Citizenship and Immigration Services. Form I-90, Instructions for Application to Replace Permanent Resident Card When USCIS accepts the application, it mails a Form I-797 receipt notice. For renewals of an expiring or expired card, that notice extends the validity of your old card for 36 months from the expiration date, and you can present the expired card together with the receipt notice as proof of status and work authorization during that window.12U.S. Citizenship and Immigration Services. USCIS Extends Green Card Validity Extension to 36 Months for Green Card Renewals
If you don’t have the card at all and need proof of status quickly, call the USCIS Contact Center and request an ADIT stamp (also called an I-551 stamp). USCIS can issue it as temporary evidence of lawful permanent resident status, valid for up to one year, and in some cases can mail it on a Form I-94 rather than requiring an in-person visit.13U.S. Citizenship and Immigration Services. USCIS Announces Additional Mail Delivery Process for Receiving ADIT Stamp The stamp is accepted for Form I-9, REAL ID, and reentry.
A Note on Conditional (Two-Year) Cards
If you got your Green Card through a marriage that was less than two years old at the time of approval, or through certain investor categories, your card is valid for only two years.14U.S. Citizenship and Immigration Services. Conditional Permanent Residence The card number is in the same place and works the same way, but you cannot renew it with Form I-90. You file Form I-751 or Form I-829 within the 90-day window before it expires.15U.S. Citizenship and Immigration Services. When to File Your Petition to Remove Conditions Missing that window can cost you your status, so calendar it early if you hold a two-year card.
Keep a Backup Copy
Your Green Card carries enough personal information to cause real damage if it’s misused: your A-Number, full legal name, date of birth, country of birth, and the card number. Photocopy both sides and keep the copy somewhere secure at home, separate from the card itself. That copy is the fastest way to recover the card number if the card ever goes missing, and it’s the documentation you’ll want if you have to report the card lost or stolen and file for a replacement.