where do i find the usps tracking number The USPS tracking number can be found on your receipt, in the shipping confirmation email, or on the package itself if you’ve shipped or received a package via USPS. This unique number allows you to track the status of your shipment online, ensuring you stay updated on its progress from the sender to the destination. If you’re receiving a package, the tracking number is typically provided by the sender or seller, giving you direct access to shipping updates.