Of 56 counties in Big Sky Country, Flathead County ranks second by size (5,255 square miles). Flathead County is in Glacier Country Montana. Montana's Flathead County includes almost 3,000 acres of riverfront homes and property for sale based on recent Land Network data. The combined market value of farms and ranches for sale here was about $30 million. Browse all waterfront property for sale in Flathead County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits! The most common type of land for sale by combined acreage in Flathead County is residential property.