<Tr> <Th> FIPS code </Th> <Td> 04 - 71230 </Td> </Tr> <Tr> <Th> GNIS feature ID </Th> <Td> 0012003 </Td> </Tr> <P> Supai (Havasupai: Havasuuw) is a census - designated place (CDP) in Coconino County, Arizona, United States, within the Grand Canyon . </P> <P> As of the 2010 census, the CDP had a population of 208 . The capital of the Havasupai Indian Reservation, Supai is the only place in the United States where mail is still carried out by mules . </P>

Town at the bottom of the grand canyon