What is the primary way mail carriers track packages?

The primary way mail carriers track packages is through the use of tracking numbers and barcode scanners. Each package is assigned a unique tracking number that allows for the identification and monitoring of its progress as it moves through the postal system. When a package is scanned at various points during transit—such as when it is picked up, sorted, or delivered—the system updates the package's status in real-time. This provides both the carrier and the customer with the ability to see the current location and anticipated delivery time of their package.

Using tracking numbers and barcode scanners is an efficient and reliable method that enhances the accuracy of tracking and helps to ensure that packages reach their intended destinations promptly.