USCIS N-400 Form: US Citizenship application form (Naturalization)

Form N-400 – Application for Naturalization (Official USCIS n-400 Form)

The Form N-400 is the official application used to apply for United States citizenship through the U.S. Citizenship and Immigration Services (USCIS).

This form is intended for lawful permanent residents (Green Card holders) who meet the eligibility requirements to become U.S. citizens.

What is Form N-400 used for?

Form N-400 allows applicants to:

• formally apply for U.S. citizenship

• provide complete personal and biographical information

• declare family, employment, and travel history

• answer security and background questions

• begin the naturalization process, including the interview and civics test

Important information before completing the form

• The form must be completed accurately and truthfully

• Any errors, omissions, or inconsistencies may cause delays or denial

• All answers must reflect your current legal and personal situation

• Supporting documents may be required depending on your case

Official source

This is the official USCIS Form N-400, provided for informational and preparation purposes.
For filing instructions, fees, and the most recent updates, always refer to the official USCIS guidelines.

Who should use this form?

You may be eligible to file Form N-400 if you:

• have been a permanent resident for the required period

• meet continuous residence and physical presence requirements

• demonstrate good moral character

• can read, write, and speak basic English (with limited exceptions)

• have knowledge of U.S. history and government

⚠️ This document does not replace legal advice. If your situation is complex, consider consulting a qualified immigration professional before submitting your application.