Where do I mail the AOS Package ?
A. You will need to mail your application to: U.S. Citizenship and Immigration Services P.O. Box 805887 Chicago, IL 60680-4120 Or, for non-United States Postal Service (USPS) deliveries (e.g. private couriers) U.S. Citizenship and Immigration Services Attn: FBASI 427 S. LaSalle 3rd Floor Chicago, IL 60605-1098 A. The mail receiving station for the National Benefits Center, located in Lees Summit MO, is a lockbox facility in Chicago. The mail is opened in Chicago, applications are screened for completeness (nothing obviously missing), and then sent on to Lees Summit for processing. I-765 will be processed to completion at the NBC. I-485 will receive some processing and then will be sent for completion to either the appropriate District Office for interview or to the California Service Center if it’s felt that an interview may not be required.
