Custer County is in Southeast Montana. Of the 56 counties in the Treasure State, 3,793-square-mile Custer County ranks 11th by size. There is about 8,000 acres of residential land for sale in Montana's Custer County based on recent Land Network data. The combined market value of farms, ranches, hunting land and other land for sale here is approximately $19 million. The average price of residential land for sale in Custer County was $1 million. Browse all residential land and rural property for sale in Montana 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.