It is named for Johann de Kalb, a German hero in the American Revolution. The seat is Sycamore, while the largest city is DeKalb.
It borders Boone, McHenry, Kane, Kendall, LaSalle, Lee, Ogle and Winnebago Counties.
Main highways include I-88, US-30, US-34, IL-23, IL-38, IL-64 and IL-72.
Cities
Cortland
DeKalb
Genoa
Kingston
Kirkland
Malta
New Lebannon
Somonauk