The N-600 form is the application for Certificate of Citizenship it is filed by an individual to claim U.S. citizenship either by action of law while in the U.S. or born outside of the United States to U.S. citizen parent(s) who would like to document their U.S. citizenship status based on U.S. citizen parentage.
Biological or adopted child of a U.S. citizen born outside the United States can claim U.S. citizenship by action of law if the following applies:
• one parent is a U.S. citizen either by birth or naturalization;
• applicant generally resides in United States with legal and physical custody of your U.S. Citizen parent;
• applicant entered the U.S. lawfully for permanent residence. (Note: If an individual entered the U.S. as an adopted child, you should have been admitted as IR-3 (child adopted outside the U.S.). If admittance to the U.S. was based on an IR-4 (child entering U.S. to be adopted), the final adoption must take place for this section of law to apply to you);
• applicant has not reached the age of 18 years old
• applicant is the biological child; you were legitimate, or you were legitimated while in the legal custody of your legitimating parent(s) prior to your 16th birthday; or
• applicant is a biological child born out of wedlock and you have not been legitimated and your mother naturalized as a U.S. citizen.
Note: If the applicant is now 18 years of age, and all the above criteria applied to you before you reached the age of 18, and you were under the age of 18 on February 27, 2001 (date law took effect), you may file form N-600 to obtain Certificate of Citizenship.