Before there were airplanes and trucks that delivered the mail there was the "Pony Express". Founded in 1858 by John Butterfield, the first Pony Express were stagecoaches that ran from St. Louis, MO to San Fracisco, CA in just 24 days. These guys would carry up to 750 pounds of mail! Later, single Pony Express riders regularly traveled over a central route, 2000 miles between St. Joseph, MO to Sacramento, CA in just 10 days! Those guys weren't horsing around!
The ZIP (Zone Improvement Plan) code was started in 1963. People started using a 5 digit number at the end of the address when they mailed letters. The first 3 numbers stands for which part of the country your in, and the last two numbers stand for which post office. Big cities have many, many post offices.
The largest postal system in the world is the United States Postal Service. With over 780,000 people working for them, they handle about half of all the mail in the world.
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