Of 102 counties in the Land of Lincoln, Clark County is 54th in terms of its size (504 square miles). Clark County is in Central Illinois. Clark County, Illinois, includes approximately 1,000 acres of riverfront property for sale based on recent Land Network data. The combined market value of land and rural real estate for sale here was almost $1 million. Browse all waterfront property for sale in Clark 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 Clark County is residential property.