A combined nearly 100,000 acres were listed for sale in Fallon County recently; the overall value of all Fallon County farms, ranches, and rural real estate for sale was approximately $11 million. Fallon County ranks 34th in the state for the combined amount of land currently advertised for sale. Baker featured the most land for sale. Fallon County is the 46th biggest county (1,622 square miles) in Montana. It's located in the Southeast Montana region of Montana.