Forms Guide
All USCIS forms related to U.S. citizenship applications
📋 Quick Reference
Most applicants only need Form N-400 (naturalization) or Form N-600 (proof of existing citizenship). All forms are available for free download from USCIS.gov.
Naturalization
Applications for becoming a U.S. citizen through naturalization
Application for Naturalization
Standard naturalization application
Some fee exemptions apply (military, certain low-income applicants)
Application to Preserve Residence for Naturalization Purposes
For LPRs who need to be absent from U.S. for 1+ year for qualifying employment
Citizenship Proof
Applications to document existing citizenship (birth abroad or derivative)
Application for Certificate of Citizenship
Form N-600 is used by permanent residents to obtain a Certificate of Citizenship if they automatically became a U.S. citizen through birth abroad to U.S. citizen parents or through derivation after a parent naturalized.
Application for Citizenship and Issuance of Certificate Under Section 322
Form N-600K is used for children residing outside the United States to apply for citizenship based on their U.S. citizen parent or grandparent.
Supporting Forms
Fee waivers, disability accommodations, and other supporting documentation
Medical Certification for Disability Exceptions
To request waiver of English and/or civics requirement due to disability
No fee (submitted with N-400)
Request for Fee Waiver
Request exemption from USCIS filing fees based on income or hardship
No fee to submit
Filing Tips
- •Always use the latest version of each form. USCIS rejects outdated editions. Check the edition date in the bottom-left corner.
- •File online when available. N-400 can be filed online at myUSCIS, which is faster and allows tracking.
- •Fee waivers (I-912) are available for applicants receiving means-tested benefits or with income below 150% of the Federal Poverty Guidelines.
- •Military applicants pay no filing fee for N-400 when filing under INA § 328 or § 329.
- •Keep copies of everything you submit. Send by certified mail or use online filing for delivery confirmation.
Disclaimer: Forms and fees are subject to change. Always verify current requirements on USCIS.gov. This is general information, not legal advice.