DeKalb County, Illinois
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 / 41.89°N 88.77°W | |
| Country | United States |
| State | Illinois |
| Founded | March 4, 1837 |
| Named after | 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 |
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.