Of 44 counties in the Gem State, 4,938-square-mile Custer County ranks third by size. Custer County is in the Central Idaho region. Idaho's Custer County includes nearly 1,000 acres of residential land and property for sale based on recent Land Network data. The combined market value of farms, ranches, hunting land and other land for sale here was nearly $31 million. The average price of residential acreage for sale in Custer County was $3 million. Browse all residential land and rural property for sale in Idaho to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.