| Place Name | Rock Falls |
| Place Type | City |
| ZIP Code(s) | 61071 |
| County | Whiteside County |
| Area Code(s) | 815,779 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 9,075 |
| Population Growth Rate (2010-19) | -5.15% |
| Majority Ethnicity | White 79.52% |
| Metro/Micro Stats Area | Sterling, IL |
| US Congressional District(s) | Illinois 17th |
| State House Districts | 71 |
| State Senate Districts | 36 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 79.52% |
| African American | 0.39% |
| Hispanic | 0.4% |
| Asian | 0.22% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 19.48% |