The combined value of land for sale in Montana's Valley County recently on Land.com was approximately $15 million. This represents nearly 100,000 acres of land for sale in Valley County. Valley County ranks 45th in Montana for the combined amount of land currently advertised for sale. Glasgow featured the most land for sale. Valley County has a large agricultural economy, with 654 farms recorded in the county during the latest U.S. Census. Farming activities in Valley County generate annual revenues of $7 million, most of which is from crops. Valley County is one of the ten largest counties in Montana (5,061 square miles). It's located in the Missouri River Country Montana region of Montana.