The N-400 Application for Naturalization requires more than just the form itself — USCIS expects a specific set of supporting documents with your application packet. Missing even one required document can trigger a Request for Evidence (RFE), adding months to an already lengthy process.
Here's the honest reality: there's no single universal document list. What you need depends on your specific eligibility basis and personal history. Someone applying based on five years of Lawful Permanent Resident (LPR) status with no absences, no criminal history, and no prior marriages submits a very different package than someone with extended absences, a criminal record, or prior citizenship claims.
This guide walks through the core required documents everyone submits, then the conditional documents based on your specific situation. Check N-400 eligibility requirements first to confirm which basis applies to you — that determines which document categories are relevant.
These documents go with every N-400 application regardless of your specific situation:
Form N-400 (completed and signed) — The application itself. Sign in blue or black ink. USCIS rejects unsigned applications without processing them.
Two passport-style photos — Taken within 30 days of filing. White background, 2×2 inches, full front view of face. Write your name and Alien Registration Number (A-Number) lightly in pencil on the back of each photo.
Copy of Permanent Resident Card (Green Card) — Front and back copy of your current, valid green card. If your green card is expired, you'll likely need to renew it before applying for naturalization — expired green cards complicate the application.
Filing fee payment — Currently $760 for most applicants ($640 form fee + $85 biometric services fee), or $320 for applicants 75 or older (no biometrics fee). The N-400 application fee guide covers fee waivers and reduced fees for qualifying low-income applicants.
Beyond the core documents, your specific situation determines what else you need:
If applying as a spouse of a US citizen: Evidence of your US citizen spouse's citizenship (passport, birth certificate, or naturalization certificate). Evidence of the bona fide marriage — joint financial accounts, lease agreements, utility bills, tax returns filed jointly, photos together over time. If your spouse was previously married, evidence that all prior marriages ended (divorce decrees, death certificates).
If you've been outside the US for extended periods: Any absence of 6+ months during a single trip requires explanation. Absences of 12+ months may break continuous residence entirely unless you filed Form N-470 in advance. You'll need documentation showing why you were abroad and evidence of maintained US residence (maintained lease or mortgage, US bank accounts, US employment, US tax filing).
If you have a criminal record: Certified court dispositions for every arrest, charge, or conviction — even if the case was dismissed, expunged, or resulted in no conviction. This is a common application-killer: applicants submit the N-400, list an arrest, and then fail to include the certified disposition. USCIS always requests it, turning a straightforward application into months of delay.
If you've ever been married — whether that marriage is ongoing, ended in divorce, or ended by death — you'll need documentation:
If any of these documents are from a foreign country, you'll need official translations into English. The translator doesn't need to be certified by a government agency, but must include a signed statement certifying their competency to translate and the accuracy of the translation.
If you served in the US military (or are currently serving), include:
Military members and veterans may qualify for expedited naturalization under INA Section 328 or 329 — different eligibility rules apply.
Male applicants who were required to register with Selective Service (US males who lived in the US between ages 18–26) must provide proof of registration. You can get a registration acknowledgment letter from the Selective Service System website. If you were required to register but didn't, you'll need to explain why — and this can be a significant obstacle to naturalization.
If your current name on your green card differs from the name you've used on other documents, or if you want to officially change your name at naturalization (which you can do through the N-400 process), include relevant documentation: marriage certificates showing name changes, court orders for name changes, or explanation of any discrepancy between document names.
USCIS doesn't want originals — they want copies. Keep your originals; submit photocopies. The exception is photos: submit the actual passport-style photographs, not copies of photos.
Organize your package logically: the N-400 form on top, photos clipped to the application, filing fee payment method (check or money order payable to "U.S. Department of Homeland Security"), then supporting documents in a logical order. Some applicants include a cover letter listing what's enclosed — this isn't required, but it can help if something gets separated or questioned.
Mail to the correct USCIS Lockbox based on your state and whether you're filing with expedited processing. The N-400 mailing address guide has current Lockbox addresses by state.
After submission, track your application status through myUSCIS. The typical N-400 processing time runs 8–24 months depending on the USCIS field office handling your case. Our N-400 status check guide explains how to monitor your application and what status updates mean.
A few mistakes that consistently slow down or derail applications:
Submitting expired green card copies — If your green card expired before filing, you're missing a valid copy. Renew or apply to replace it first.
Leaving out arrest dispositions — If you disclosed an arrest but didn't include certified court records, expect an RFE within weeks of filing. Get those records before you apply.
Untranslated foreign documents — Any document not in English must be accompanied by a certified English translation. No translation = USCIS returns the document.
Wrong photo format — Photos taken against a colored background, with glasses (no longer allowed per recent USCIS guidance), or at incorrect dimensions get rejected at biometrics. Use a photo service familiar with passport/visa photo standards.
Practice the N-400 civics and documentation process with our N-400 Civics Test Preparation practice questions. Understanding both the document requirements and the civics content you'll face at the interview is the most effective way to prepare. Check the N-400 Common Pitfalls practice test for the mistakes applicants most frequently make — and how to avoid them.
Submitting your N-400 with complete documentation is the first major hurdle. The second is the USCIS naturalization interview, where an officer reviews your application, tests your English proficiency, and administers the civics test.
The civics test consists of 20 questions drawn from a 128-question pool, of which you need to answer at least 12 correctly. It's not a hard test — but it requires actual preparation. Our N-400 Civics Test Preparation 2 practice tests cover the full question pool with the actual answers you need to know.
Our N-400 English Language Requirements test explains what the English proficiency component expects — and who qualifies for exemptions based on age and years of residency. Start both practice sets now so you're ready for every stage of the process, not just the paperwork.