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Established February 1, 1919 with its county seat at Dubois. Named for Sam K. Clark, early settler on Medicine Lodge Creek who became the first state senator from Clark County. The city of Dubois was named for U.S. Senator Fred Dubois, a prominent Idaho political figure in early history. 

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Established January 22, 1864 with its county seat at Soda Springs. In 1866 it was moved to Malad City, because of its growth and its location on the stagecoach line and freight road between Corinne, Utah, and the mines in Butte, Montana. 

Established in February 27, 1911 with its county seat at Orofino. Named for the Clearwater River whose name was translated from the Nez Perce term Koos-Koos-Kai-Kai, describing clear water. 

Established January 8, 1881 with its county seat at Challis. Named for the General Custer mine, which was named in honor of General George Custer who died at the Battle of Little Bighorn.