Land for sale in Illinois's Clark County recently totaled nearly $10 million and nearly 1,000 acres. Clark County ranks 60th out of 102 counties in the state for the total number of acres of land currently advertised for sale. There were two properties listed as sold in Clark County through the Land Network Comparable Sales Program. This represented a total value of $755,000. Among cities in Clark County with farms, rural land, hunting land and other land for sale, 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 Illinois.