Bannock County is a county located in the southeastern part of the U.S. state of Idaho. It was established in 1893 and named after the local Bannock tribe. It is part of the Pocatello, Idaho Metropolitan Statistical Area, which encompasses all of Bannock and Power counties. As of the 2000 Census the county had a population of 75,565 (2008 estimate: 80,812). The county seat and largest city is Pocatello.