Of 44 counties in the Gem State, Adams County ranks 22nd in terms of size (1,369 square miles). Adams County is in Southwestern Idaho. A recent survey of Land Network data includes nearly 6,000 acres of riverfront land for sale in Idaho's Adams County, which is valued at a combined $17 million. Browse all waterfront property for sale in Adams 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 Adams County is undeveloped land.