Of 56 counties in Big Sky Country, Treasure County is 53rd in terms of its size (984 square miles). Treasure County is in Southeast Montana. Recent Land Network data totals approximately 1,000 acres of ranches for sale in Montana's Treasure County, which is valued at a combined $2 million. Browse all Treasure County ranches for sale on the Land Network to find the ranch that's right for your business or commercial needs, from the sprawling legacy ranch to unbelievable residential ranch for your second home, investment property or retirement nest egg. The most common type of land for sale by combined acreage in Treasure County is undeveloped land.