FillStride N-400 Application for Naturalization (Form N-400)

Issued by USCIS. This site is not the issuer. Checked against the issuer on 2026-11-03. Issuer's page · Instructions

Lawful permanent residents and qualifying individuals who want to become naturalized U.S. citizens fill out this application and submit it to U.S. Citizenship and Immigration Services (USCIS). You need your 9-digit A-Number, full legal name, any other names or dates of birth you have used, and the date you became a lawful permanent resident. If a physical, developmental, or mental impairment prevents you from meeting English or civics requirements, you must also have a completed Form N-648 to submit alongside it.

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