Sells is an unincorporated community and census-designated place in Pima County, Arizona, United States. The population was 2,799 at the 2000 census. It is the capital of the Tohono O'odham Nation and the home of several of their tribal businesses, such as Tohono O'Odham Ki:Ki Association. Originally named Indian Oasis, by cattle-ranchers/businessmen brothers, Joseph and Louis Ménager in 1912. The Ménager brothers also built and ran the Indian Oasis Mercantile Store.