Custer County is a rural mountain county in the center of the U.S. state of Idaho. As of the 2020 census, the population was 4,275, making it the fifth-least populous county in Idaho. The county seat
Mill used to process gold and silver ore at Yankee Fork mining operations.
Leatherman Peak, 12,228 feet (3,727 m), second highest in Idaho, in the Lost River Range in eastern Custer County