The United States Postal Service, also known as the Post Office, U.S. Mail, or Postal Service, is an independent agency of the executive branch of the United States federal gove Customer service: 1 (800) 275-8777 Founder: United States Congress Founded: July 1, 1971, Washington, D.C. Headquarters: Washington, D.C. Agency executives: Louis DeJoy, Postmaster General; Douglas Tulino, Deputy Postmaster General; Employees: 653,167 (516,636 career personnel, 136,561 non-career personnel) as of 2021