Pocatello is the county seat and largest city of Bannock County, with a small portion on the Fort Hall Indian Reservation in neighboring Power County, in the southeastern part of the U.S. state of Idaho. It is the principal city of the Pocatello metropolitan area, which encompasses all of Bannock County. As of the 2020 census, the population of Pocatello was 56,326. Pocatello is the 6th most populous city in the state, just behind Caldwell.