| Name | DeKalb County |
| State | Illinois |
| FIPS Code | 17037 |
| County Seat | Sycamore |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 100,661 |
| Population Growth Rate(2020-2024) | 0.15% |
| Majority Ethnicity | White 75.78% |
| Public School Majority Ethnicity | White 60% |
| Partisan Voting Index | Democratic:+1 |
| Unemployment Rate (May 2026) | 5.4% |
| Sales Tax Rate (2025) | 8% |
| Area Code(s) | 815 / 779 / 224 / 847 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 75.78% |
| African American | 7.72% |
| Hispanic | 13.91% |
| Asian | 2.11% |
| Native American | 0.43% |
| Hawaiin/Pacific Islander | 0.03% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 59.62% |
| African American | 13.06% |
| Hispanic | 21.29% |
| Asian | 1.13% |
| Native American | 0.24% |
| Hawaiin/Pacific Islander | 0.06% |