Boise County is in Southwestern Idaho. Of the 44 counties in the Gem State, 1,906-square-mile Boise County ranks 15th by size. The most common type of land for sale by combined acreage in Boise County is undeveloped land. Browse all waterfront property for sale in Boise 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!