Stephenson County is in Northern Illinois. Of the 102 counties in the Land of Lincoln, Stephenson County is 45th in terms of its size (565 square miles). The most common type of land for sale by combined acreage in Stephenson County is undeveloped land. Browse all waterfront property for sale in Stephenson 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!