 The Caribou precinct with 342 residents also contained residents within present-day Caribou County, but also included territory now in Bonneville county.Bannock County was established on March 6, 1893.Bancroft, Chesterfield, Chubb Springs (now Henry), Gentile Valley (now Thatcher), Salt River (now Freedom), and Soda Springs were in existence at the 1900 census with a combined population of 3,430.