DeKalb County, Illinois

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DeKalb County is a county located in the U.S. state of Illinois. In 2000, the population was 88,969. As of 2007, the population is estimated at 103,729. Its county seat is Sycamore, Illinois.[1] DeKalb County is part of the Chicago metropolitan statistical area.



DeKalb County was formed in 1837 out of Kane County, Illinois. The County was named in honor of Johann de Kalb, a German (Bavarian) hero of the American Revolutionary War. Kalb was with Gen. Washington at Valley Forge. He was killed at the Battle of Camden.


Unlike similarly spelled locations, such as DeKalb County, Georgia, DeKalb denizens from Illinois pronounce the county name /dɨˈkælb/ "di-KALB", with an L sound, as opposed to a silent "L."


According to the U.S. Census Bureau, the county has a total area of 635 square miles (1,644.6 km2), of which 634 square miles (1,642.1 km2) is land and 1 square mile (2.6 km2) (0.13%) is water.

Adjacent counties

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