 In 1839 a log structure was built and called the county courthouse; the log building stood across the street from the current courthouse.Ten years later, in 1850, the second DeKalb County Courthouse was erected.From December 13, 1902 until April 17, 1924, DeKalb-Sycamore Electric Traction Company operated a trolley route between the two cities (DeKalb and Sycamore), which ended at the DeKalb County Courthouse.