Custer County is in Southeast Montana. Of the 56 counties in the Treasure State, Custer County ranks 11th in terms of size (2 million acres). Montana's Custer County includes 8,000 acres of residential land for sale based on recent Land Network data. The combined market value of farms, ranches, hunting land and other land for sale here was around $18 million. The average price of residential acreage 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.