The overall value of land and rural real estate for sale in Clark County recently on Land.com was $9 million. This represents nearly 1,000 acres of land for sale in Clark County. Clark County ranks 61st out of 102 counties in the Land of Lincoln for the combined amount of land currently advertised for sale. There were four properties listed as sold in Clark County through the Land Network Comparable Sales Program. This represented a total value of $1,231,400. Casey had the most land for sale. Manufacturing and related services are the largest economic sectors in Clark County. Clark County is Illinois's 54th largest county (504 square miles). It's located in the Central Illinois region of the state.