Of 102 counties in the Prairie State, Warren County is 49th in terms of its size (543 square miles). Warren County is in Western Illinois. There is roughly 1,000 acres of lakefront land and property for sale in Warren County, Illinois, based on recent Land Network data. The combined market value of farms, hunting land and other rural land and acreage for sale here is 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.