Land for sale in Powder River County, Montana, recently totaled $30 million and around 100,000 acres. Powder River County ranks 47th in Montana based on the total acres of land for sale of the 56 counties in the Treasure State. Among cities in Powder River County with land for sale, Broadus had the most land for sale. Based on its natural assets, Powder River County's economy is dependent on tourism and recreation. Powder River County is Montana's 16th biggest county (3,298 square miles). It's located in the Southeast Montana region of the state.