Ace the Postal Challenge 2026: Elevate Your Skills with the PSE Window Clerk Test!

The primary responsibility of the United States Postal Service (USPS) is processing and delivering mail and packages. This encompasses a wide range of essential functions, including the collection, sorting, and transportation of mail, as well as the final delivery to recipients across the country and internationally. The USPS has a long history of providing reliable mail services, ensuring that communication and goods are delivered in a timely manner to every address, regardless of its location.

While managing online shipments, collecting taxes on packages, and providing insurance on packages may be relevant services or functions within the postal ecosystem, they do not represent the core mission of the USPS. The agency’s main role is centered on mail delivery, making option C the most accurate and relevant choice.