The combined value of farms, hunting land and other rural land and acreage for sale in Champaign County, Illinois, recently on Land.com was around $96 million. This represents approximately 100,000 acres of farms, hunting land and other rural land and acreage for sale in Champaign County. Based on the combined acreage of land and rural property for sale here, Champaign County has the most land for sale of the 102 counties in the Land of Lincoln. Urbana had the most land for sale. From an economic perspective, government and state-level services contribute most to Champaign County's overall GDP. Champaign County is one of the ten biggest counties in Illinois (998 square miles). It's located in the Central Illinois region of the state.