The value of all farms, hunting land and other rural land and acreage for sale in Illinois's DeKalb County recently was almost $106 million, representing a total of 2,755 acres of land for sale in DeKalb County. DeKalb County ranks 16th in Illinois 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. Dekalb had the most land for sale. Government and state-level services are the main economic drivers in DeKalb County. DeKalb County is the 31st largest county (634 square miles) in Illinois. It's located in the Northern Illinois region of Illinois.