There was a total of $11 million of land and rural real estate for sale in Fallon County recently on Land.com. The total acreage of all Fallon County farms, ranches, hunting land and other land for sale was almost 100,000 acres. Fallon County ranks 34th in the state for the total acreage of land currently advertised for sale. Among cities in Fallon County with land for sale, Baker featured the most land for sale. Fallon County is the 46th largest county (1,622 square miles) in Montana. It's located in the Southeast Montana region of Montana.