What is the difference between naturalizing, obtaining a citizenship certificate and applying for a passport?
N-400 asks USCIS to naturalize an eligible applicant. N-600 seeks a Certificate of Citizenship for a citizenship claim through a parent, while a passport application asks the Department of State to issue a travel and identity document supported by citizenship evidence. Replacing a certificate is another task and does not create citizenship again.
Sources: N-400: Naturalization · N-600: Certificate of Citizenship · Form N-565: replacement citizenship and naturalization documents · All 5 sources · Checked October 25, 2026
What this guide covers
- Start with whether citizenship is being acquired or documented
- USCIS certificates document different citizenship foundations
- The Department of State has a separate passport evidence process
At a glance
- Naturalization and documentation of an existing citizenship claim are different tasks.
- USCIS certificates and State passports have different application owners.
- Losing a certificate does not itself require becoming a citizen again.
Start with whether citizenship is being acquired or documented
Naturalization is a process for becoming a citizen when the applicable requirements are met. A person who already acquired citizenship at birth or later through a parent is asking a different question: how to establish and document that existing citizenship. The existence of a Green Card or absence of a certificate does not settle that distinction by itself.
USCIS certificates document different citizenship foundations
A Certificate of Naturalization follows the naturalization process. A Certificate of Citizenship can document citizenship derived or acquired through a parent under the applicable law. N-600 is not an alternative adult naturalization application selected merely because it sounds like a shorter document process. The claimed citizenship event and relevant history determine the question to be examined.
The Department of State has a separate passport evidence process
State lists a qualifying full-validity undamaged passport, CRBA, Certificate of Naturalization and Certificate of Citizenship among primary evidence for people born outside the United States. Where primary evidence is unavailable, the source describes secondary-evidence routes tied to the person's circumstances. The passport agency assesses its own application; a passport request is not submitted to USCIS using N-600.
Replacement follows the owner of the missing document
USCIS's N-565 process concerns specified citizenship or naturalization documents, while passport replacement and CRBA replacement belong to State's separate procedures. Losing evidence is not, by itself, losing the underlying citizenship. A photocopy or scan can help identify a prior record without automatically satisfying the current evidence requirement of the receiving institution.
Read document and translation instructions in the actual context
State's current citizenship-evidence page has passport-specific original-copy, photocopy and translation instructions. They should not be replaced with a generic USCIS evidence rule. Keep a birth or parentage record distinguishable from a document proving citizenship, and seek individual review if the claimed event is uncertain. This comparison does not decide citizenship or tell a reader which application to file.
| Item or stage | Meaning | Owner or next source |
|---|---|---|
| N-400 | Application to become a citizen through naturalization | USCIS |
| N-600 | Certificate documenting a citizenship claim through a parent | USCIS |
| N-565 | Replacement of specified citizenship or naturalization evidence | USCIS |
| U.S. passport or CRBA | State document with its own evidence and replacement process | Department of State |
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Sources & verification
Follow the institution that owns the requirement and check its current instructions.
Common questions
Is N-600 another way to apply for adult naturalization?
No. N-600 concerns a Certificate of Citizenship for the applicable citizenship-through-parent claim. N-400 is the naturalization application; the underlying facts must be understood before selecting a task.
Sources: N-400: Naturalization · N-600: Certificate of Citizenship · Form N-565: replacement citizenship and naturalization documents · All 5 sources
Does losing a naturalization certificate mean losing citizenship?
Loss of the physical evidence does not itself recreate or undo the citizenship event. The appropriate replacement process depends on the document and issuing agency.
Sources: N-400: Naturalization · N-600: Certificate of Citizenship · Form N-565: replacement citizenship and naturalization documents · All 5 sources
Does USCIS issue U.S. passports?
The Department of State handles U.S. passport applications and applies its current evidence requirements. USCIS certificate applications are a separate process.
Sources: N-400: Naturalization · N-600: Certificate of Citizenship · Form N-565: replacement citizenship and naturalization documents · All 5 sources
Can one generic translation rule be used for every certificate and passport request?
No. Check the receiving authority's actual instructions. State's passport citizenship-evidence guidance includes requirements that should not be silently substituted with a USCIS rule.
Sources: N-400: Naturalization · N-600: Certificate of Citizenship · Form N-565: replacement citizenship and naturalization documents · All 5 sources
About this guide
By Immigrant Insider editorial desk. Updated .
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