There was a combined $33 million of farms, hunting land and other rural land and acreage for sale in Jackson County, Illinois, recently on Land.com. The total acreage of all Jackson County land for sale was approximately 1,000 acres. Jackson County ranks 23rd in the state for the total acreage of land currently advertised for sale. Carbondale had the most land for sale. From an economic perspective, government and state-level services contribute most to Jackson County's overall GDP. Jackson County is Illinois's 37th biggest county (602 square miles). It's located in the Southern Illinois region of Illinois.