The value of all land and rural real estate for sale in Illinois's DeKalb County recently was $100 million, representing a combined 2,688 acres of land for sale in DeKalb County. DeKalb County ranks 17th out of 102 counties in the state for the combined amount of land currently advertised for sale. There were five properties listed as sold in DeKalb County through the Land Network Comparable Sales Program. This represented a total value of $5,750,000. Of all farms, hunting land and other rural land and acreage for sale in DeKalb County, 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.