What is usps isc chicago?

The USPS ISC (International Service Center) Chicago is a mail processing center located in Chicago, Illinois. It serves as a sorting and processing facility for international mail and packages being sent to and from the United States. This center handles a large volume of mail and packages daily from all over the world including letters, flats, parcels, and express mail. It also provides custom clearance services for incoming international parcels. The center is equipped with advanced technology and automated systems to provide timely and efficient processing and delivery of international mail. ISC Chicago is one of the busiest international mail processing facilities in the United States.