The USCIS uses different methods for calculating the processing times, but all calculations are based on completed cases. For some types of application forms, the agency uses the following format:
- Naturalization (N-400): 17.5 to 21 months
- Certificate of Citizenship (N-600): 6.5 to 14.5 months
- Citizenship and Issuance of Certificate Under Section 322 (N-600K): 10 to 22.5 months
These are the times at the Seattle field office. To explain further, let’s consider the example of the N-600 application. The 14.5 months indicates the time for completing the majority (93%) of the cases.
Note that in some cases your office will ask another office to process your case. If this happens to you, you may receive documents and notices from the new location. However, the USCIS still arranges your biometrics at the center that’s nearest to your provided location.
Another noteworthy thing here is that you should be quick in informing the federal agency about any change of addresses. You can do so online from the e-request section.