- Certificate of Citizenship (N-600): 7.5 months to 16 months
- Citizenship and Issuance of Certificate Under Section 322 (N-600K): 8 months to 23.5 months
- Naturalization (N-400): 12.5 months to 17.5 months
Case processing is done in the order the applications are received. The USCIS is doing a pilot in which they are giving a time range for the processing time for many application forms. For forms that are not part of the pilot, the old method is still in use.
An important thing to remember about case processing is that part of the processing work may be forwarded to another office. The purpose of this transfer is that applications may be processed faster by doing this transfer. If this is the case with your application, you may receive a notification for an interview from another office.