The value of all farms, ranches, and rural real estate for sale in Montana's Yellowstone County recently was nearly $386 million, representing a total of 64,076 acres of land for sale in Yellowstone County. Yellowstone County ranks third in Big Sky Country based on the total acres of land for sale of all the counties in the Treasure State. Among cities in Yellowstone County with farms, ranches, and rural real estate for sale, Billings featured the most land for sale. Yellowstone County is the 23rd biggest county (2,648 square miles) in Montana. It's located in the Southeast Montana region of Montana.