The World’s Southernmost Post Office

At the very bottom of the world, the southernmost post office operates at the Amundsen-Scott South Pole Station, right at the South Pole.

Run by the United States, it serves a small, ever-changing community—around 150 people in summer and about 50 during the harsh winter months.

Mail from here follows a long and unusual journey. It is routed through Christchurch, New Zealand, and can take weeks to arrive. Despite the extreme location, it operates under standard USPS rules, complete with its own ZIP code: 96598.

Deliveries depend on ski-equipped aircraft flying in during a short seasonal window, making every letter that leaves the South Pole a small logistical achievement.