The combined value of farms, ranches, and rural real estate for sale in Flathead County recently on Land.com was almost $1 billion. This represents almost 100,000 acres of land for sale in Flathead County. Flathead County ranks first in Montana for the total acreage of land currently advertised for sale. Of all farms, ranches, and rural real estate for sale in Flathead County, Kalispell had the most land for sale. Based on its natural assets, Flathead County's economy is dependent on tourism and recreation. Flathead County is one of the ten largest counties in Montana (5,255 square miles). It's located in the Glacier Country Montana region of Montana.