| Place Name | Ottawa |
| Place Type | City |
| ZIP Code(s) | 61350 |
| County | LaSalle County |
| Area Code(s) | 815,779 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 19,258 |
| Population Growth Rate (2010-19) | 0.38% |
| Majority Ethnicity | White 86.19% |
| 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 | 86.19% |
| African American | 4.42% |
| Hispanic | 0.06% |
| Asian | 0.98% |
| Native American | 0.02% |
| Hawaiin/Pacific Islander | 8.33% |