I believe it is to let the postman know that he should collect mail from it, but I am not sure. I am surprised nobody seems to know this, as they seem to have them by almost every house.
The address of the American Flag Foundation Inc is: Po Box 435, Riderwood, MD 21139-0435
The American flag has red horizontal lines and in one box there is full of stars in the blue background
The only party that can place mail in a mail box is a United States Postal employee and you. Using a mail box for unpaid unpostaged flyers is against the law. Notice they don't let you place any flyers on the community bulletin board either. Buy a stamp! The US Postal Service regulates the type of boxes allowed. In rural area's, the placement and height of the box for accessability by the rural carrier's car is dictated by the local office. I don't know if it's illegal to place a flyer on the outside of the mail box but the inside contents are reserved for you and the mail carrier only. The flag on the box is designed to alert the mail carrier you have outgoing mail so sticking a flyer and moving the flag to secure it is tampering with the mail.
American flag is correct.
The American Flag.
American flag
mailbox
what is the design of the American flag
There is no such thing as the south American flag, the north American flag or the American flag. Countries have flags, not continents.
13 Stripes on the American Flag
The significance of American flag is to show that were the best.
No you may not iron the American flag.