When your mail carrier shows up Tuesday, make sure to pop your head out and thank them.
It's National Thank a Mail Carrier Day!
And for good reason -- our mail carriers work six days a week, 52 weeks a year to get our mail to us.
In honor of the day, here are a few fun facts for you:
The first organized mail service in America was established in 1775.
Benjamin Franklin was the first Postmaster General.
Stamps were invented in 1847.
Zip codes have been around since 1963.