The purpose of Form N-600K is for a child who is a child of a United States citizen and live outside the United States to claim citizenship based upon parentage. A U.S. Citizen parent claiming citizenship on behalf of a minor child, biological or adopted, and whose child regularly resides outside the United States file Form N-600K. If a U.S. Citizen parent of a child who would meet the eligibility requirements but has died, a U.S. Citizen parent of the deceased U.S. Citizen parent may file Form N-600K on behalf of the child. Otherwise, a legal guardian of the child may also file Form N-600K.

Form N-600K should be filed if the child:

1. In the case of minor children under the age of 18 years, the Form N-600K must be filed by the United States citizen parent with legal and physical custody of the minor child.
2. In the case of Form N-600K application filed by a U.S. Citizen parent of a deceased citizen parent or an application filed by a U.S. Citizen legal guardian, the child does not have to residing in the legal and physical custody of the applicant;
3. Will not have reached an eighteenth birthday at the time of fulfilling the requirements for citizenship, pursuant to Form N-600K, including the required interview of the United States citizen parent and the child, and
4. Is a biological child or a child who was legitimated while in the custody of the legitimating parent before reaching sixteen years of age; or
5. Is an adopted child who has a full and final adoption and the child is the beneficiary of an approved Form I-600 or fulfilled the two year legal custody and two year joint residence requirements of INA section 101(b)(1)(E).