Customers Must Mail Form I-290B for Form N-600 or Form N-600K to the Chicago Lockbox
Starting January 1, 2016, customers who wish to file Form I-290B, Notice of Motion or Appeal, in response to a decision on their Form N-600 or N-600K must mail their Form I-290B to the Chicago Lockbox. USCIS will no longer accept these forms at local field offices.
Customers should mail their Form I-290B for Form N-600 or N-600K to: