DeKalb County, Illinois

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
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 United States
State Illinois
Founded4 March 1837
Named forJohann de Kalb
SeatSycamore
Largest cityDeKalb
Area
  Total635 sq mi (1,640 km2)
  Land631 sq mi (1,630 km2)
  Water3.4 sq mi (9 km2)  0.5%
Population
 (2020)
  Total100,420
  Density160/sq mi (61/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional districts11th, 14th, 16th
Websitewww.dekalbcounty.org

DeKalb County is part of the Chicago–Naperville–Elgin, IL–IN–WI Metropolitan Statistical Area.

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