A post office is a public facility and a retailer that provides mail services, such as accepting letters and parcels, providing post office boxes, and selling postage stamps, packaging, and stationery. Post offices may offer additional services, which vary by country. These include providing and accepting government forms, and processing government services and fees. The chief administrator of a post office is called a postmaster.
A post office building in Edithburgh, Australia
The West Toledo Branch Post Office in Toledo, Ohio, in 1912
The old General Post Office on Lombard Street, London, in 1803
A Canadian sorting office in 2006
A post office box is a uniquely addressable lockable box located on the premises of a post office.
An American post office box full of mail
PO boxes of various sizes in a German post office, with their number range and postcodes written above them
Post office boxes next to the S-market supermarket in Klaukkala, Finland
Outdoor Post Office Boxes (as common in Switzerland) numbers one to six at 9054 Haslen, Switzerland