Land for sale in Idaho's Custer County recently totaled around $84 million and nearly 2,000 acres. Custer County ranks 33rd in the state for the total number of acres of land currently advertised for sale. Of all locations in Custer County with ranches, farms, hunting land and other rural land and acreage for sale, Challis featured the most land for sale. Mining and mineral extraction-related services are the main economic drivers in this part of Idaho. Custer County is one of the ten biggest counties in Idaho (4,938 square miles). It's located in the Central Idaho region of Idaho.