Land for sale in Valley County recently totaled almost $23 million and nearly 100,000 acres. Valley County ranks 36th based on the combined acreage of land for sale of all the counties in the Treasure State. Nashua featured the most land for sale. Its economy is defined as agricultural, with 654 farms recorded in the county during the most recent 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 biggest counties in Montana (5,061 square miles). It's located in the Missouri River Country Montana region of the state.