N-400 at St. Louis Field Office
Form N-400, Application for Naturalization, is filed with USCIS to apply for US citizenship.
Verified from USCIS on 2026-06-05
How N-400 compares to other forms at the St. Louis Field Office
St. Louis processes N-600 (certificate of citizenship), N-600K (citizenship under section 322), and I-485 (adjustment of status) in addition to N-400. N-600 sits at 8.0 to 10.0 months, N-600K at 8.5 to 9.0, and I-485 at 10.0 to 16.0. I-485 has the widest range. N-400 sits at 9.5 to 11.5 months, a 2-month band in the middle of the office's range. The combined sibling spread of 8.5 months runs about 4.2 times the N-400 band.
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Frequently Asked Questions
How long does N-400 take at St. Louis Field Office?
Current processing time for N-400 at St. Louis Field Office is 10.5 months to 11.5 months, based on the latest data from USCIS.
When was N-400 processing time data last updated?
The data was last updated on 2026-06-05, sourced from USCIS.
What factors affect N-400 processing time?
Processing times vary based on application volume, case complexity, security checks, and the completeness of submitted documentation. Times shown are estimates and individual cases may differ.