A total of 100,000 acres were listed for sale in Gallatin County, Montana, recently, representing a combined nearly $1 billion in Gallatin County farms, ranches, hunting land and other land for sale. Gallatin County ranks second out of 56 counties in the Treasure State for the combined amount of land currently advertised for sale. Bozeman featured the most land for sale. Government and state-level services are the main economic drivers in Gallatin County. Gallatin County is Montana's 24th largest county (2,633 square miles). It's located in the Yellowstone Country Montana region of Montana.