KALAMAZOO, Mich. — The United States Postal Service (USPS) is ramping up its efficiency in Kalamazoo with the installation of a new sorting machine capable of processing up to 5,000 packages per hour.

The newly upgraded USPS facility in Avondale can process 1 million packages daily with its new sorting machine. This upgrade is part of a $40 billion investment to improve delivery speeds and service ...