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DeKalb County, Illinois
County in Illinois, United States / From Wikipedia, the free encyclopedia
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.[1] Its county seat is Sycamore.[2] DeKalb County is part of the Chicago–Naperville–Elgin, IL–IN–WI Metropolitan Statistical Area.
Quick Facts Country, State ...
DeKalb County | |
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![]() DeKalb County Court House, Sycamore, Illinois | |
![]() Location within the U.S. state of Illinois | |
![]() Illinois's location within the U.S. | |
Coordinates: 41°53′N 88°46′W | |
Country | ![]() |
State | ![]() |
Founded | March 4, 1837 |
Named for | Johann de Kalb |
Seat | Sycamore |
Largest city | DeKalb |
Area | |
• Total | 635 sq mi (1,640 km2) |
• Land | 631 sq mi (1,630 km2) |
• Water | 3.4 sq mi (9 km2) 0.5% |
Population (2020) | |
• Total | 100,420 |
• Estimate (2023) | 100,288 ![]() |
• Density | 160/sq mi (61/km2) |
Time zone | UTC−6 (Central) |
• Summer (DST) | UTC−5 (CDT) |
Congressional districts | 11th, 14th, 16th |
Website | www |
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