Oct 28, 2025 · Naturalization is the process of becoming a U.S. citizen if you were born outside of the United States. Use this form to apply for naturalization if you meet the eligibility requirements.

Are you 50 years of age or older and have you lived in the United States as a lawful permanent resident for periods totaling at least 20 years at the time you file your Form N-400?

Find out if you are eligible to become a U.S. citizen, how to apply with USCIS Form N-400, and how to prepare for an interview and naturalization test.

Jul 22, 2025 · Get your U.S. citizenship application right. Follow this updated 2025 checklist to gather the right documents for Form N-400 and avoid USCIS delays.

Form N-400, Application for Naturalization, is an application to become a naturalized U.S. citizen. If your biological or legal adoptive mother or father is a U.S. citizen by birth, or was naturalized …

Please refer to the instructions for the form(s) you are filing for additional information or you may call the USCIS Contact Center at 800 -375-5283. For TTY (deaf or hard of hearing) 800767- …

Read this guide to Form N-400 for your U.S. citizenship application and understand the legal intricacies and requirements for a successful citizenship journey.