is the us post office a private company
United States Postal Service The United States Postal Service (USPS; also known as the Post Office, U.S. Mail, or Postal Service) is an independent agency of the United States federal government responsible for providing postal service in the United States. It is one of the few government agencies explicitly authorized by the United States Constitution.
Public company For many years, newly created companies were privately held but held initial public offering to become publicly traded company or to be acquired by another company if they became larger and more profitable or had promising prospects. More infrequently, some companies — such as investment banking firm Goldman Sachs and logistics services provider United Parcel Service (UPS) — chose to remain privately held for a long period of time after maturity into a profitable company.