Fill out N-600 (Application for Certificate of Citizenship) online
Form N-600 is used to obtain a Certificate of Citizenship from USCIS. It is filed by individuals who claim to have acquired or derived U.S. citizenship through birth abroad to a U.S. citizen parent, or through the naturalization of a parent while the individual was a child and a permanent resident.
How to fill out N-600 (Application for Certificate of Citizenship)
Determine your basis for citizenship
Identify whether you acquired citizenship at birth (born abroad to a U.S. citizen parent) or derived citizenship (through a parent naturalization). The requirements differ based on the applicable law at the time of birth or derivation.
Enter applicant and parent information
Provide the applicant full legal name, date of birth, place of birth, and current address. Enter the U.S. citizen parent's information including date and place of birth, citizenship status, and periods of physical presence in the U.S.
Gather evidence of citizenship
Include the applicant's birth certificate, the U.S. citizen parent birth certificate or naturalization certificate, marriage certificate of the parents, evidence of the parent physical presence in the U.S., and proof of lawful permanent residence if claiming derived citizenship.
Submit the application
File online or by mail with the filing fee, all supporting evidence, and passport-style photographs. If the applicant is under 18, the U.S. citizen parent or legal guardian signs the application.
About N-600 (Application for Certificate of Citizenship)
Who needs this form
Individuals who acquired U.S. citizenship at birth through a U.S. citizen parent (born outside the U.S.) or who derived citizenship automatically through a parent naturalization while the child was under 18 and a lawful permanent resident. The applicant must already be a citizen; the N-600 documents existing citizenship rather than granting it.
Where to submit
File with USCIS online at uscis.gov or by mail to the appropriate lockbox facility. If the applicant is under 18, a U.S. citizen parent or legal guardian files on their behalf.
Source and content freshness
- Reviewed: 2026-02-16
- Filing deadlines may shift for weekends and holidays. Verify due dates with official instructions.
Common mistakes to avoid
- Applying when the person is not actually a U.S. citizen (the N-600 documents existing citizenship, it does not naturalize)
- Not providing sufficient evidence of the parent U.S. citizenship and physical presence in the U.S.
- Confusing N-600 with N-400 (N-400 is for naturalization; N-600 is for documenting existing citizenship)
- Not including the child full birth certificate with both parents names
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What is the difference between N-600 and N-400?
N-600 is used to document U.S. citizenship that was already acquired or derived automatically (through a U.S. citizen parent). N-400 is used to apply for naturalization (becoming a U.S. citizen through the legal process). If you already have citizenship through your parent, you file N-600. If you are a permanent resident seeking to become a citizen, you file N-400.
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