Jefferson County is in Eastern Idaho. Of the 44 counties in the Gem State, Jefferson County ranks 28th in terms of size (707,657 acres). The most common type of land for sale by combined acreage in Jefferson County is house. Browse all waterfront property for sale in Jefferson 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!