N-400 Case Tracker & Status Guide
From receipt to the oath ceremony — every N-400 milestone and what it really means.
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What is Form N-400?
Form N-400, Application for Naturalization, is the application lawful permanent residents file to become U.S. citizens after meeting the residence, physical-presence, and good-moral-character requirements.
The process runs from filing through biometrics, the interview and civics test, and finally the oath ceremony where citizenship is granted.
The N-400 milestone sequence
Behind each plain-English status the public site shows, USCIS records an internal event code. Here is the typical N-400 ladder and the codes that drive it:
How long does N-400 take?
Timelines vary heavily by field office. The interview and oath steps are the longest waits, and the public tracker often lags the internal record by weeks.
Common N-400 questions
How long after the N-400 interview is the oath ceremony?
It ranges from same-day to several weeks depending on the field office. The internal API often shows the oath being scheduled before any public notice arrives.
What does "Interview Was Scheduled" mean on my N-400?
USCIS has set your naturalization interview and civics test (event code FJ). Watch for the appointment notice by mail and in your online account.
See your own case, explained.
See every step USCIS has recorded for your case, in plain English: your timeline, silent updates, and what usually comes next for cases like yours.
Check my case freeWe are immigration applicants and technologists who built CaseStatusAPI to help others navigate the USCIS process with transparency. Our guides are informed by firsthand experience, community feedback, and deep analysis of USCIS internal API data.
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