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-Naperville-Elgin, IL-IN-WI Metropolitan Statistical Area. DeKalb County was formed on 4 March 1837, out of Kane County, Illinois. The county was named for Johann de Kalb, a German (Bavarian) hero of the American Revolutionary War. DeKalb County's area is approximately 632.7 square miles, and is located 63 miles west of Chicago. There are 19 townships in the county with the county seat at Sycamore. More information...
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