track and trace us post The USPS Track and Trace service allows customers to monitor the status of their shipments in real-time. By entering the tracking number provided when the package was shipped, customers can access detailed information about their parcel’s location, expected delivery date, and any delays. USPS Track and Trace is available for most USPS services, including Priority Mail, First-Class Mail, and International shipments. This service provides peace of mind for buyers and sellers, offering transparency throughout the shipping process.