Form details
USCIS Form N-400
Application for Naturalization
Agency: U.S. Citizenship and Immigration Services
Source checked 6 September 2026. Appears to be the current published version.
Form information
What this process is for
Used to apply to become a U.S. citizen through naturalization. AccessForce explains the process and the information requested; USCIS decides eligibility.
- Online application
- An online filing option is published by USCIS.
- Save and resume
- The AccessForce experience can be paused and resumed at any question.
- Where to ask for help
- AccessForce provides application guidance and does not determine legal eligibility. You may want to confirm with USCIS or an accredited representative.
- Official source
- uscis.gov