| Name | Whiteside County |
| State | Illinois |
| FIPS Code | 17195 |
| County Seat | Morrison |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 54,582 |
| Population Growth Rate(2020-2024) | -2.05% |
| Majority Ethnicity | White 85.52% |
| Public School Majority Ethnicity | White 72% |
| Partisan Voting Index | Republican:+6 |
| Unemployment Rate (May 2026) | 5.5% |
| Sales Tax Rate (2025) | 7.75% |
| Area Code(s) | 815 / 779 / 309 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 85.52% |
| African American | 1.04% |
| Hispanic | 12.72% |
| Asian | 0.49% |
| Native American | 0.22% |
| Hawaiin/Pacific Islander | 0.01% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 71.57% |
| African American | 1.59% |
| Hispanic | 21.08% |
| Asian | 0.5% |
| Native American | 0.26% |
| Hawaiin/Pacific Islander | 0.08% |