What is the purpose of the USPS ZIP Code system?

The USPS ZIP Code system is designed primarily to simplify and expedite the process of mail sorting. ZIP Codes allow for quick identification of specific geographic areas, which facilitates efficient routing of mail through the postal system. By assigning unique codes to different regions, postal workers can quickly determine where to send mail, reducing the time it takes to get letters and packages to their destinations. This streamlining is crucial for maintaining a reliable and timely mail delivery service.

While elements such as verifying mailing addresses and potentially restricting mail delivery areas may be secondary benefits of the system, the main objective revolves around improving the efficiency of sorting and delivering mail. This is why the choice highlighting the simplification and acceleration of mail sorting is the correct answer.