Custer County is in Southeast Montana. Of the 56 counties in the Treasure State, 3,793-square-mile Custer County ranks 11th by size. The total value of around 8,000 acres of residential land recently listed for sale in Custer County, Montana, was roughly $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.