McCammon is a city in Bannock County, Idaho, United States. It is part of the Pocatello, Idaho Metropolitan Statistical Area'. The population wa…McCammon is a city in Bannock County, Idaho, United States. It is part of the Pocatello, Idaho Metropolitan Statistical Area'. The population was 825 at the 2020 census. In 1892, McCammon became the junction point between the Oregon Short Line Railroad and Utah and Northern Railway, and city gained the nickname Junction City.