DeKalb County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 105,160. Its county seat is Sycamore. DeKalb County is part of the Chicago-Naperville-Elgin, IL-IN-WI Metropolitan Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 635 square miles (1,640 km²), of which 631 square miles (1,630 km²) is land and 3.4 square miles (8.8 km²) (0.5%) is water.
As of the 2010 United States Census, there were 105,160 people, 38,484 households, and 23,781 families residing in the county. The population density was 166.6 inhabitants per square mile (64.3/km²). There were 41,079 housing units at an average density of 65.1 per square mile (25.1/km²). The racial makeup of the county was 85.1% white, 6.4% black or African American, 2.3% Asian, 0.3% American Indian, 3.9% from other races, and 2.0% from two or more races. Those of Hispanic or Latino origin made up 10.1% of the population. In terms of ancestry, 32.6% were German, 17.5% were Irish, 8.7% were English, 7.0% were Polish, 6.4% were Italian, 6.3% were Swedish, and 3.8% were American.
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