“In June 1788, the ninth state ratified the Constitution, which gave Congress the power ‘To establish Post Offices and post Roads’ in Article I, Section 8. A year later, the Act of September 22, 1789 (1 Stat. 70), continued the Post Office and made the Postmaster General subject to the direction of the President. Four days later, President Washington appointed Samuel Osgood as the first Postmaster General under the Constitution. A population of almost four million was served by 75 Post Offices and about 2,400 miles of post roads.”
The Postal Service delivers more mail to more addresses in a larger geographical area than any other post in the world. We deliver to millions of addresses in every state, city and town in the country. Everyone living in the United States and its territories has access to postal products and services and pays the same for a First-Class postage stamp regardless of their location.
Today there are 687,188 civilian employees in the US Postal Service (392,070 male and 295,118 female), many of them members of the American Postal Workers Union (APWU), National Association of Letter Carriers (NALC), or the National Rural Letter Carriers’ Association (NRLCA). The US Post Office is the number two employer of veterans in the United States behind only the US Department of Defense.
In 2017, the Post Office handled 149.5 billion pieces of mail, 58.7 billion of those pieces were sent by First Class mail. There were 30,825 Post Offices across the country mailing 157.3 million mailing stops (delivery points).
Source: 2017 American Community Survey 1-Year Estimates, US Post Office Facts & Figures