The exterior of the post office is made of metal and has many visible screws shown around it. It is tan and has blue circular windows along with a blue door that leads to the inside of the building. It has an arrow at the side of the building, pointing to the roof that contains many shapes to represent envelopes. It has the post office's name written on it in blue and red lettering. Lastly, the entire building is shaped like a box.
Role in series
SpongeBob, after watching an ad for Mr. Magic's Magical Kit, mails money via the Bikini Bottom Post Office in order to get it delivered to him. He mails himself with the money and is delivered back to his home in four to six weeks.
SpongeBob writes a letter to the Vikings, but a mailfish grabs it and leaves it in a bin. Soon after, a Viking who works as a garbage man in Bikini Bottom finds the letter and brings it to the King of all Vikings.