| Place Name | South Ottawa Township |
| Place Type | Township |
| ZIP Code(s) | 61350 |
| County | LaSalle County |
| Area Code(s) | 815,779 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 8,355 |
| Majority Ethnicity | White 93.52% |
| Metro/Micro Stats Area | Ottawa, IL |
| US Congressional District(s) | Illinois 16th |
| State House Districts | 76 |
| State Senate Districts | 38 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 93.52% |
| African American | 1.37% |
| Hispanic | 0% |
| Asian | 0.31% |
| Native American | 0.05% |
| Hawaiin/Pacific Islander | 4.76% |