There was a total of around $89 million of land and rural real estate for sale in DeKalb County recently on Land.com. The total of all DeKalb County farms, rural land, hunting land and other land for sale was approximately 3,000 acres. DeKalb County ranks 19th out of 102 counties in the Prairie State for the total acreage of land currently advertised for sale. Among cities in DeKalb County with farms, hunting land and other rural land and acreage for sale, Sycamore featured the most land for sale. From an economic perspective, government and state-level services contribute most to DeKalb County's overall GDP. DeKalb County is the 31st largest county (634 square miles) in Illinois. It's located in the Northern Illinois region of the state.