DeKalb County is a county located in the U.S. state of Illinois. As of the 2020 United States census, the population was 100,420. Its county seat is Sycamore. DeKalb County is part of the Chicago–Nape
DeKalb County Court House, Sycamore, Illinois
The Ogle County Judicial Center, across the street from the Old Ogle County Courthouse in Oregon, Illinois