Naturalization Hit Its Fastest Pace Since 2016 — Then a Filing Surge Pushed the N-400 Backlog Past 640,000
N-400 naturalization processing hit a median 5.7 months in FY2025 — the fastest since 2016 — but a fall 2025 filing surge pushed the backlog above 640,000 cases and lengthened average times to 7.9 months.