About National Thank a Mailman Day
Six days a week, 52 weeks a year, in all weather conditions, the mail carrier brings the post... on February 4th each year, we say "thank you" to our local mail carrier.
Also known as Mail Carrier Day.
From the United States Postal Service: An American History, page 4:
The Constitution and the Post Office
“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, 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.”