Land for sale in Montana's Powder River County recently totaled nearly $30 million and nearly 100,000 acres. Powder River County ranks 46th based on the total amount of acres of land for sale of the 56 counties in the Treasure State. Broadus featured the most land for sale. Based on its natural assets, tourism and recreation are important factors in the Powder River County economy. Powder River County is Montana's 16th biggest county (3,298 square miles). It's located in the Southeast Montana region of Montana.