United States Post Office Department

The Post Office Department (1792–1971) was the name of the United States Postal Service when it was a Cabinet department. It was headed by the Postmaster General. The Postal Service Act signed by President George Washington on February 20, 1792, established the Department. Postmaster General John McLean was the first to call it the Post Office Department rather than just the "Post Office." The organization received a boost in prestige when Presid... More

Successor agency:

Ceased Operations:

  • Jul 1, 1971

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