The overall value of ranches, farms, hunting land and other rural land and acreage for sale in Roosevelt County recently on Land.com was almost $27 million. This represents 100,000 acres of farms, ranches, and rural real estate for sale in Roosevelt County. Roosevelt County ranks 40th in the state for the total acreage of land currently advertised for sale. Bainville had the most land for sale. Roosevelt County is the 29th biggest county (2,369 square miles) in Montana. It's located in the Missouri River Country Montana region of Montana.