Supai Village – located in the Grand Canyon National Park, Arizona, USA is the only place in the world with mail delivered by mules.
In 2010, the population here was about 208 pp.
To get inside the village, people would need to walk, get on a helicopter or riding on mules.
For delivery here, the only way is by mule.
Every year, there are around 20,000 travelers who come here to experience the life of the village. As a result, tourism becomes the main income of the people there.