| Place Name | Onarga Township |
| Place Type | Township |
| ZIP Code(s) | 60938 60955 60968 |
| County | Iroquois County |
| Area Code(s) | 815,779 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 1,522 |
| Majority Ethnicity | White 57.36% |
| US Congressional District(s) | Illinois 16th |
| State House Districts | 106 |
| State Senate Districts | 53 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 57.36% |
| African American | 0.8% |
| Hispanic | 0.63% |
| Asian | 0.06% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 41.16% |