Of 44 counties in the Gem State, Jefferson County ranks 28th by size (1,105 square miles). Jefferson County is in Eastern Idaho. A recent survey of Land Network data includes roughly 1,000 acres of riverfront land and property for sale in Idaho's Jefferson County, which is valued at a combined $2 million. 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! The most common type of land for sale by combined acreage in Jefferson County is undeveloped land.