Form N-400, Application for Naturalization
Apply to become a naturalized US citizen.
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About USCIS Form N-400, Application for Naturalization
Form N-400 is the application a lawful permanent resident files to become a naturalized US citizen. It collects your history and eligibility details and leads to an interview and a decision.
This page is a general guide and helper only. It is not legal or immigration advice. Always download and file the current official form from USCIS, since some USCIS forms must be completed on the official version.
Who needs to complete it
- Lawful permanent residents who meet the required residence period.
- Permanent residents applying based on marriage to a US citizen.
- Eligible members of the military and their families.
- Green Card holders ready to take the next step to citizenship.
How to fill out USCIS Form N-400, Application for Naturalization
- 1Read the instructions to confirm you meet the eligibility rules for the category you are using.
- 2Enter your current legal name and any name changes you are requesting.
- 3Provide your permanent resident details, date of birth, and contact information.
- 4List your addresses, employment, and time spent outside the United States for the required period.
- 5Complete the sections on marital history, children, and family.
- 6Answer the eligibility and good moral character questions carefully and honestly.
- 7Review, sign, and date the application, and note any preparer or interpreter.
- 8Assemble the supporting documents and file per the current instructions, then prepare for the interview and tests.
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Frequently asked questions
Who can apply with Form N-400?
Lawful permanent residents who meet the residence, physical presence, and other eligibility rules explained in the instructions can apply for naturalization.
Is there an interview?
Most applicants attend an interview and take the English and civics tests unless an exception applies. The instructions and USCIS materials explain what to expect.
Can I change my name through this form?
The form includes a place to request a legal name change, which may be granted as part of the naturalization process in many cases.
Is this the official form?
This page is a helper and general guide, not legal or immigration advice. Always download and file the current official form from USCIS at the link provided.