Of 102 counties in the Land of Lincoln, Warren County ranks 49th in terms of size (543 square miles). Warren County is in Western Illinois. Warren County, Illinois, includes about 1,000 acres of lakefront property for sale based on recent Land Network data. The combined market value of farms, rural land, hunting land and other land for sale here was about $400,000. Browse all waterfront property for sale in Warren 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 Warren County is residential property.