The county of DeKalb is located in Illinois and was founded in 4 March 1837. There are 105,160 residents in DeKalb who have access to courthouses in Sycamore. In general, each county has a full set of courts, from traffic court to superior and appellate court; supreme courts are usually located in the state capital. Illinois is part of the 7th federal circuit court as well.
There are 17,519 residents in Sycamore, which is 9.7 square miles.