People often search for this issue as Certificate of Citizenship, USCIS Certificate of Citizenship, Form N-600, or proof of U.S. citizenship. A Certificate of Citizenship is USCIS-issued proof that a person is already a U.S. citizen (often through citizenship at birth or citizenship through parents), and Form N-600 is the common application used to obtain the certificate.
Certificate of Citizenship (Form N-600) — Proof of U.S. Citizenship
Certificate of Citizenship (Form N-600) — Proof of U.S. Citizenship
Certificate of Citizenship vs U.S. passport vs Certificate of Naturalization
A Certificate of Citizenship is USCIS-issued proof that a person is already a U.S. citizen (often through citizenship at birth or citizenship through parents). It is different from a U.S. passport, which is travel/documentation issued by the Department of State, and different from a Certificate of Naturalization, which is issued to people who became U.S. citizens by completing the naturalization process.
Many people use a U.S. passport as proof of citizenship for most everyday purposes, but some situations (including certain USCIS filings and record-correction situations) may require or strongly benefit from a Certificate of Citizenship. If a person is already a citizen through a parent, Form N-600 is commonly used to request the USCIS certificate.
Certificate of Citizenship Details
A certificate of citizenship is a document issued by US Citizenship and Immigration Service (USCIS) as proof of a person having obtained US citizenship through derivation or acquisition at birth (when born outside of the United States).
For Whom Is a Certificate of Citizenship Appropriate?
Individuals born outside the US that have a claim to US Citizenship.
Certificate of Citizenship Requirements
You can obtain a certificate of citizenship if you fall into one of the following categories.
- US Citizenship through Birth
Any child born in the US automatically acquires US citizenship, even if the child’s mother was in the US illegally. Unless the child was born to a foreign diplomat at the time of birth.
- US Citizenship through Parents
Even though a child is born outside the US, the child can automatically acquire US citizenship if at least one parent was a US citizen at the time of the child’s birth.
- US Citizenship through Adoption
Children under 18 years of age holding green cards may be naturalized if petitioned for by a US citizen parent.
- US Citizenship Retention
Individuals born and raised outside the US, being unaware of having acquired US citizenship through their parents or grandparents and have therefore failed to fulfill US residency requirements may claim US citizenship through the Doctrine of Constructive Retention.
Who should file Form N-600 (citizenship through parents)?
Form N-600 is commonly used by people who are already U.S. citizens but need USCIS-issued proof of that citizenship. Many cases involve citizenship through parents, including:
- Children who automatically became U.S. citizens after a parent naturalized and the child met the legal requirements (often discussed as “derivative citizenship”)
- People who were U.S. citizens at birth through a U.S. citizen parent (often discussed as “acquired citizenship”), but want USCIS documentation
- Certain adoption-based situations where the child may have obtained citizenship through a parent and needs documentation
Because eligibility depends on dates, parent citizenship status, custody/residence facts, and supporting records, the best first step is building a clear family and residence timeline and matching it to the applicable citizenship rule.
Frequently asked questions about the Certificate of Citizenship (Form N-600)
What is a Certificate of Citizenship?
A Certificate of Citizenship is USCIS-issued proof that a person is already a U.S. citizen, often through citizenship at birth or citizenship through parents.
What is Form N-600?
Form N-600 is the USCIS application commonly used to request a Certificate of Citizenship.
Do I need Form N-600 if I already have a U.S. passport?
Not always. A U.S. passport is widely accepted as proof of citizenship, but some situations may require or strongly benefit from having a Certificate of Citizenship, especially for record clarity and certain USCIS-related purposes.
What is the difference between a Certificate of Citizenship and a Certificate of Naturalization?
A Certificate of Citizenship documents that the person was already a U.S. citizen through a parent or birth-related rule. A Certificate of Naturalization is issued after a person becomes a U.S. citizen through the naturalization process.
Who qualifies for a Certificate of Citizenship?
Many applicants qualify through citizenship through parents (derivative citizenship) or citizenship at birth through a U.S. citizen parent (acquired citizenship). Eligibility depends on the family timeline and supporting records.
What documents are commonly needed for an N-600 application?
Common documents include proof of the parent’s U.S. citizenship, the child’s birth certificate, proof of the parent-child relationship, legal custody/physical custody evidence where relevant, and proof of the child’s residence in the U.S. with the U.S. citizen parent.
How long does Form N-600 take?
Processing times vary. Submitting a complete, well-organized package with clear evidence can help avoid delays and requests for evidence.
