Form N-600 Instructions
Certificate of Citizenship · citizenship at birth · automatic citizenship after birth · Form N-600
Source reviewed 2026-10-01Do not apply to become a citizen until you check whether citizenship already happened by law.
N-600 or N-400? Some People Are Already Citizens Before They Ever Think About Naturalization
How Form N-600 fits people born abroad who acquired citizenship at birth or automatically after birth through a U.S.-citizen parent, and why that is fundamentally different from naturalization on Form N-400.
Direct answer
Short answer
Form N-600 is used to request a Certificate of Citizenship for certain people who already acquired U.S. citizenship at birth or automatically after birth. It is not the naturalization application. USCIS explains that a person who already became a citizen through a parent may document that citizenship through N-600 or, in appropriate cases, a U.S. passport rather than filing N-400 to naturalize.
On this page
N-600 documents citizenship that already exists
For a qualifying person, the legal event creating citizenship occurred under the citizenship statute. N-600 is evidence of that status, not the event that naturalizes the person.
Automatic citizenship after birth has its own statutory conditions
USCIS policy for INA 320 includes conditions involving a U.S.-citizen parent, lawful permanent residence, age, and legal and physical custody. The applicable law depends on when the conditions were met.
Citizenship at birth uses a different historical rule set
For a child born abroad to a U.S.-citizen parent, the law in effect on the date of birth can control, including parentage and physical-presence requirements. Do not use today’s rule for a person born decades ago.
Certificate of Citizenship and U.S. passport can both matter as proof
USCIS and Department of State have different roles in documenting citizenship. A person may need to decide which evidence is appropriate for the immediate problem and long-term record.
Questions people actually ask
Frequently asked questions
Should someone who automatically became a citizen file N-400?
Generally, N-400 is for naturalization, while N-600 documents citizenship already acquired. The person’s citizenship history should be resolved before choosing a form.
Can an adult file N-600 for citizenship acquired as a child?
Yes, if the person already acquired citizenship under the applicable law and can prove the required facts. USCIS instructions allow adults to file on their own behalf.
Is a U.S. passport enough evidence of citizenship?
A valid U.S. passport is recognized as primary citizenship evidence in Department of State guidance, but some people also choose to obtain a Certificate of Citizenship for a durable USCIS record.
Authority and current-source review
Official sources supporting this page
These links identify primary or official materials used to control material legal and procedural statements. They are not a substitute for advice about a particular matter.
Policy Manual: Automatic Acquisition of Citizenship After Birth
INA 320 · automatic citizenship · child of U.S. citizen · N-600
Source reviewed 2026-10-01Citizenship Evidence
CRBA · U.S. passport · citizenship evidence · foreign birth
Source reviewed 2026-10-01The next useful move
Start with the exact ground, not the label someone gave it
Waivers, citizenship claims, labor certification, and returning-resident cases all turn on precise statutory facts. Bring the notices, applications, travel history, family records, court records where relevant, and the actual government finding before choosing a form.
Important legal and service limitations
General U.S. immigration and citizenship information only. This page is not legal advice, does not create an attorney-client relationship, and does not guarantee eligibility, waiver approval, visa issuance, admission, citizenship, permanent residence, or any other result.