Established February 11, 1919 with its county seat at Soda Springs, the last county in Idaho to be created.
Named for the Caribou Mountains, in the Caribou National Forest, which in turn is named for Jesse "Carriboo" Fairchild, who had taken part in the gold rush in the Caribou region of British Columbia in the late 1860s. Subsequently, he discovered gold in this region which began a gold rush that lasted twenty years. The area was on the routes of the earliest explorers, fur trappers and Oregon Trail emigrants. Thousands of emigrants passed through the present site of Soda Springs, so named for the many effervescent natural springs in the area.
Land Area: 1,799 square miles.
There are 25 populated areas in the County