Of 56 counties in the Treasure State, Treasure County ranks 53rd by size (984 square miles). Treasure County is in Southeast Montana. The total value of around 1,000 acres of ranches recently listed for sale in Treasure County, Montana, was almost $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.