To track a USPS shipment, enter the tracking number into the tool on the USPS website. A tracking number is given to the customer when the package is shipped.
Tracking is available for services such as Priority Mail Express, Registered Mail and Certified Mail. Once the shipment is made from the retailer or online, the tracking number will appear on the receipt. When the number is input into the online tracking tool, details about the packager are provided. With Priority Mail Express, customers are given step-by-step details from the exact time it was received to the exact time it was delivered. With other services, customers can see when the package or letter is out for delivery. In most cases, the USPS offers tracking as a free service with a paid shipment.