Of 56 counties in the Treasure State, Flathead County ranks second by size (5,255 square miles). Flathead County is in Glacier Country Montana. Recent listings of riverfront land for sale in Montana's Flathead County totals nearly 1,000 acres and a combined market value of about $6 million. The most common type of land for sale by combined acreage in Flathead County is residential property. 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.