Thank a Mailman Day or Mail Carrier Day in USA
Thank a Mailman Day or Mail Carrier Day in USA is held on February 4. This event in the first decade of the month February is annual. 
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American newspapers largely owe their existence to the post office. Postal employees regularly go above and beyond their job description to protect the lives of customers, especially older and disabled customers, through the Carrier Alert Program.
The postal service delivers more than 200 billion pieces of mail each year. The U.S. has more than 40,000 post offices today, and they deliver 212 billion pieces of mail each year to more than 144 million homes and businesses in the U.S., as well as Puerto Rico, Guam, the American Virgin Islands, and American Samoa.
The first post office, established in 1639 in colonial America, was in Boston, in a tavern that sold "stronge water" A man named Richard Fairbanks had established it.
Similar holidays and events, festivals and interesting facts
National Women Physicians Day in US on February 3 (is celebrated annually on the birthday of Elizabeth Blackwell, the first female clinician in the United States);
Dump Your Significant Jerk Day on February 3
The Day the Music Died on February 3 (On February 3, 1959, American rock and roll musicians Buddy Holly, Ritchie Valens, and "The Big Bopper" J. P. Richardson were killed in a plane crash near Clear Lake, Iowa, together with pilot Roger Peterson);
International Day Against Swearing on February 3
World Oncologist Day on February 4
Create a Vacuum Day on February 4
National Weatherman’s Day in US on February 5
Western Monarch Day on February 5
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