How old a person should be to file Form N-400?
It should be noted that before you start the naturalization process (Form N-400) you need to check whether you are eligible to become a US citizen. There is a list of certain requirements which need to be met. Age is one of them, a person should be 18 years old to be able to file the form.
Application for Certificate of Citizenship (Form N-600) or Application for Citizenship and Issuance of a Certificate under Section 322 (Form N-600K) is applied to children younger than 18 years old who are about to become citizens.
Related
Form N-400 | Application for Naturalization
/form/form-n-400-or-application-for-naturalization/amp/
Form N-600K | Application for Citizenship and Issuance of Certificate Under Section 322
/form/form-n-600k-or-application-for-citizenship-and-isssuance-of-certificate-under-section-322/amp/
Should all the children be listed on N-400 form?
/faq/should-all-the-children-be-listed-on-n-400-form/amp/
Form N-600 | Application for Certificate of Citizenship
/form/form-n-600-or-application-for-certificate-of-citizenship/amp/
How should you list regular trips outside the U.S. on Form N-400?
/faq/how-should-you-list-regular-trips-outside-the-us-on-form-n400/amp/
Am I a US citizen if one of my parents is?
/faq/am-i-a-us-citizen-if-one-of-my-parents-is/amp/
Recent posts
128 U.S. Citizenship Test Questions and Answers (2025 Version)
Find out which USCIS civics test you will take, study all 128 questions by topic, and try a 20-question practice test with an answer key.
DV-2027 and DV-2028 Green Card Lottery: Is Registration Open? Court Status and Next Steps
The DV-2027 Green Card Lottery has not opened, and a federal appeals court has paused an order that would have forced it open. Here is what happened, what it means for DV-2028, and how to protect yourself from fake entry sites.
DV-2026 Deadline: What Diversity Visa Winners Must Do Before September 30
A time-sensitive, official-source checklist for DV-2026 selectees: confirm selection safely, understand Visa Bulletin cut-offs, prepare for the right process, and act before the fiscal-year deadline.
Form I-9 Update for August 2026: Which Version Employers Must Use Now
A practical August 2026 update for employers on the correct Form I-9 edition, where to check the expiration date, and how to update an onboarding workflow without confusing new hires or existing records.
August 2026 Visa Bulletin: EB-2 India Unavailable, Filing Charts, and DV-2026 Deadlines
A plain-English guide to the August 2026 Visa Bulletin, with the employment-based, family-based, and Diversity Visa details applicants should check before acting.
How to Change Your Address With USCIS After Moving: E-COA, AR-11, and Pending Cases
A practical, official-source guide to reporting a move to USCIS, including pending cases, sponsors, receipt numbers, and situations requiring special instructions.