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If you have adopted, or plan to adopt, a child from another country, one of your first questions is probably whether that child is already a U.S. citizen or has to become one. The answer depends on the law in effect when the child turned 18, on the child's immigration status, and on where the child actually lives. This page explains how the two paths to citizenship for adopted children work, which one is likely to apply to your family, and how to get a document proving your child's citizenship.
Most adopted children of U.S. citizens acquire citizenship automatically, by operation of law, without ever filing a naturalization application. There is no test, no oath, and no discretion involved: either the conditions in the statute are met, or they are not.
The Child Citizenship Act of 2000 took effect on February 27, 2001. It rewrote INA section 320 and repealed the old INA section 321, replacing a complicated set of rules with the simpler automatic scheme described below.
The Child Citizenship Act of 2000 took effect on February 27, 2001. It rewrote INA section 320 and repealed former INA section 321, replacing a complicated set of rules with the simpler automatic scheme described below.
The Act is not retroactive. A child had to be under 18 on February 27, 2001 to benefit from it. In practical terms, a person born before February 27, 1983 was already 18 when the Act took effect and therefore cannot acquire citizenship under the amended version of INA section 320. Whether that person is already a U.S. citizen depends on the citizenship laws that applied before that date. Some adopted persons acquired citizenship under former INA sections 320 or 321 or other earlier provisions, while others did not. Those who never acquired citizenship generally must naturalize, if eligible. This surprises people, sometimes decades later, when they apply for a passport or a government job. If this may describe someone in your family, have the situation reviewed rather than assuming.
Conversely, anyone who did acquire citizenship under former INA section 320 or former INA section 321 remains a U.S. citizen. That status does not expire, and a Certificate of Citizenship may be requested at any age.
A child acquires U.S. citizenship automatically when all of the following are true at the same time, before the child's 18th birthday:
An adopted child must also fit the immigration law definition of "child," which for adoptees means an orphan or Hague adoptee immigrating through the intercountry adoption process, or a child adopted before age 16 who has lived with the adoptive parent in the parent's legal custody for at least two years.
Because all four conditions must line up before the 18th birthday, timing is the usual problem. A child who becomes a permanent resident at 17 and a half has very little margin.
This is the condition families most often misread. It is not satisfied by holding a green card, owning a home here, or paying U.S. taxes. The child must have his or her actual principal dwelling place in the United States, in the citizen parent's legal and physical custody. A child who is issued an immigrant visa but continues to live abroad with the family does not acquire citizenship under section 320 while that remains true, and if the 18th birthday arrives first, the section 320 path closes permanently. Families in that situation should look at section 322 instead.
The visa class on the child's immigrant visa is a reliable shortcut for figuring out what happens next.
| Visa class | What it means | What happens on arrival |
|---|---|---|
| IH-3 or IR-3 | A full and final adoption was completed abroad | The child becomes a citizen on admission to the United States. USCIS mails a Certificate of Citizenship; no application is needed. |
| IH-4 or IR-4 | The adoption will be completed in the United States | The child is admitted as a permanent resident. Citizenship follows automatically once the adoption is final and the four conditions above are met. Proof requires Form N-600. |
| IR-2 | Child of a U.S. citizen who met the two-year custody and residence requirement | Admitted as a permanent resident; citizenship follows automatically once the four conditions are met. |
The Hague Adoption Convention entered into force for the United States on April 1, 2008, and it determines which forms you file.
Which route is available is not a matter of preference. It depends on the child's country of origin and on when the process began.
When the child lives outside the United States, the citizen parent applies on Form N-600K. The main requirements are:
Adopted children must also meet the definition of child discussed above.
The Citizenship for Children of Military Members and Civil Servants Act, effective March 26, 2020, restored access to this path for children residing abroad with a U.S. citizen parent who is a member of the armed forces or a U.S. government employee stationed outside the United States.
Automatic citizenship does not automatically produce a document. Depending on the situation:
A U.S. passport is also evidence of citizenship and is often faster and cheaper to obtain. Many families get both, since a passport expires and a certificate does not.
A stepchild does not qualify for citizenship through a stepparent under these provisions. Only a legal adoption, meeting the definition of child described above, creates the relationship these sections require.
Reviewed July 31, 2026. This page is general information about U.S. immigration and nationality law, not legal advice, and it is not a substitute for advice about your own family's circumstances. Requirements and forms change; verify current details with USCIS before filing.