Mail' and personal letterboxes in the U.S., but has to compete against private package delivery services, such as United Parcel Service, FedEx, and DHL.

The Post Office has exclusive access to letter boxes marked 'U.S. and operates under a universal service obligation (USO), both of which are defined across a broad set of legal mandates, which obligate it to provide uniform price and quality across the entirety of its service area. The USPS has a monopoly on traditional letter delivery within the U.S. The USPS, as of 2021, has 516,636 career employees and 136,531 non-career employees. It is one of the few government agencies explicitly authorized by the Constitution of the United States. Mail, or Postal Service, is an independent agency of the executive branch of the United States federal government responsible for providing postal service in the U.S., including its insular areas and associated states. The United States Postal Service ( USPS), also known as the Post Office, U.S. The full eagle logo, used in various versions from 1970 to 1993

Postal Clause of the United States Constitution.

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