Your naturalization certificate number is printed in red ink in the upper right-hand corner of your Certificate of Naturalization, next to the label “No.” On a modern certificate it’s an eight-digit serial number that identifies the physical document itself.1U.S. Citizenship and Immigration Services (USCIS). Form N-550 – Certificate of Naturalization Sample This is the number that passport applications, family petitions, and security clearance forms are asking for when they request a “certificate number.”
Where the Number Appears on the Certificate
Look at the top right of the document. The red “No.” field is deliberately styled to stand out from the black printing everywhere else on the page. On a Form N-550 (the original certificate handed to you at your naturalization ceremony) and on a Form N-570 (a replacement issued after a loss, damage, correction, or name change), the number sits in the same place. A replacement carries a new certificate number that supersedes the original.2U.S. Citizenship and Immigration Services. USCIS Redesigns Citizenship and Naturalization Certificates
Older certificates can look different. Before 1991, naturalization was handled by federal and state courts rather than a centralized agency, so layout and labeling varied. Certificates issued between 1906 and 1956 used a “C-File” numbering system in the format “C-1234567.”3U.S. Citizenship and Immigration Services. Sample File Numbers If you have one of these and can’t locate the number on the face of the document, the court name and naturalization date printed on the certificate are enough for USCIS to look up the record.
Certificate Number vs. A-Number
The certificate holds two separate identifiers, and people routinely confuse them.
The certificate number (the “No.” in red) identifies the physical document. Think of it like the serial number on a piece of currency. The Alien Registration Number, or A-Number, begins with the letter “A” followed by a string of digits and identifies your personal immigration file. USCIS assigned the A-Number when you first entered the immigration system, and it stays with your record permanently, even after you become a citizen. On a modern certificate the A-Number is labeled “USCIS Registration No.”1U.S. Citizenship and Immigration Services (USCIS). Form N-550 – Certificate of Naturalization Sample
When a form asks for your “certificate number” or “naturalization certificate number,” it wants the red serial. When a form asks for your “Alien Registration Number” or “USCIS number,” it wants the A-Number. Getting these crossed on a passport application or immigration petition can delay processing, so check which one the form is asking for before you write anything in.
When You’ll Need to Provide It
The certificate number comes up more often than most new citizens expect:
- First U.S. passport application on Form DS-11. You submit the naturalization certificate itself as evidence of citizenship and enter the certificate number on the application.4U.S. Department of State. Get Citizenship Evidence for a U.S. Passport
- Updating your citizenship status with the Social Security Administration and getting a replacement Social Security card. SSA specifically wants to see the N-550.5Social Security Administration. Learn What Documents You Will Need to Get a Social Security Card
- Sponsoring a relative on Form I-130, Petition for Alien Relative, where the certificate number establishes your citizenship.
- Standard Form 86 for national security positions. Section 9.2 asks naturalized citizens to “Provide your Certificate of Naturalization number (N550 or N570).”6Office of Personnel Management. Standard Form 86 – Questionnaire for National Security Positions
- Form I-9 employment verification. A Certificate of Naturalization is a List C document proving employment authorization; you’d still need a separate List B identity document, like a driver’s license.7U.S. Citizenship and Immigration Services. Form I-9 Acceptable Documents
- Federal or state benefit applications, where the agency may run your certificate number through the SAVE system to confirm citizenship electronically.8U.S. Citizenship and Immigration Services. Verification Process
If You Can’t Find Your Certificate
If the physical document isn’t in front of you and you need the number soon, try the shortcuts first. Any previous application that asked for it, a passport application, an SF-86, an I-130, will have the number on file. If you created a USCIS online account during your naturalization, your case history there may reference it.
If those don’t work, you can submit a Freedom of Information Act request to USCIS to obtain a copy of your immigration file (your “A-File”), which contains your naturalization record and certificate number.9National Archives. Naturalization Records FOIA requests are free but can take months. The faster route in most cases is filing for a replacement certificate, which gives you a new physical document with a new number.
Filing Form N-565 for a Replacement
When the certificate is lost, stolen, or damaged, you file Form N-565, Application for Replacement Naturalization/Citizenship Document. The replacement you receive is a Form N-570 with a new certificate number.10U.S. Citizenship and Immigration Services. Application for Replacement Naturalization/Citizenship Document
The filing fee is $505 online through your USCIS account, or $555 for a paper application.11U.S. Citizenship and Immigration Services. Frequently Asked Questions on the USCIS Fee Rule Include a copy of the original certificate if you still have it, a police report or sworn statement if it was stolen, and two passport-style photos if you live outside the United States. Processing times vary and waits of several months are common, so check current USCIS case processing times before filing.
If you can’t afford the fee, Form N-565 is eligible for a fee waiver through Form I-912. USCIS will waive the fee if you meet any one of three criteria: you or a household member currently receives a means-tested benefit like Medicaid, SNAP, or SSI; your household income is at or below 150 percent of the Federal Poverty Guidelines; or you can demonstrate extreme financial hardship.12U.S. Citizenship and Immigration Services. Chapter 4 – Fee Waivers and Fee Exemptions
Expedited processing exists but is narrow. USCIS considers expedite requests case by case and generally limits them to severe financial loss, humanitarian emergencies such as serious illness or a death in the family, a clear USCIS error, or a government interest such as national security.13U.S. Citizenship and Immigration Services. Chapter 5 – Expedite Requests Needing the certificate for a passport or upcoming travel isn’t enough on its own. If travel is the pressure, applying directly for an expedited passport with the State Department is often more practical than trying to speed up the N-565.
Fixing Errors and Name Changes
If your certificate has a misspelling, wrong date of birth, or other USCIS error, you can file Form N-565 to get it corrected at no cost. There’s no filing fee when the correction addresses a USCIS clerical error.14U.S. Citizenship and Immigration Services (USCIS). Chapter 4 – Application for Replacement of Naturalization/Citizenship Document
If you need to change the name on the certificate because of a marriage, divorce, or court order that happened after naturalization, you file the same Form N-565 with the standard fee and include a certified copy of the document that established the name change.15USCIS. Instructions for Application for Replacement Naturalization/Citizenship Document USCIS will only update the name if the change occurred after naturalization. If your name was already wrong before naturalization and wasn’t caught during the process, the fix is more complicated and may require going back through the courts first.
Keeping the Certificate Safe
The naturalization certificate is a document you rarely need day-to-day and cannot easily replace in a hurry. Store the original in a fireproof safe or a bank safe deposit box. Scan or photocopy it and keep the copy somewhere separate; many agencies accept copies for initial steps even when they’ll eventually need the original.
Do not laminate the certificate. Lamination can interfere with the security features embedded in the document and may cause problems when you submit it for a passport or other official purpose. If lamination damage renders it unreadable, the only fix is the full N-565 replacement process.