Land for sale in Montana's Garfield County recently totaled almost $5 million and approximately 4,000 acres. Garfield County ranks 41st in the Treasure State for the total acreage of land currently advertised for sale. Of all locations in Garfield County with land and rural real estate for sale, Mosby had the most land for sale. Its economy is defined as agricultural, with 297 farms recorded in the county during the most recent U.S. Census. Farming activities in Garfield County generate annual revenues of $4 million, the majority of which comes from livestock products. Garfield County is one of the ten largest counties in Montana (4,849 square miles). It's located in the Missouri River Country Montana region of the state.