| Place Name | Illinois Township (Washington County) |
| Place Type | Township |
| ZIP Code(s) | 72744 72761 72769 |
| County | Washington County |
| Area Code(s) | 479 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 689 |
| Majority Ethnicity | White 77.89% |
| Metro/Micro Stats Area | Fayetteville-Springdale-Rogers, AR |
| US Congressional District(s) | Arkansas 3rd |
| State House Districts | 80 |
| State Senate Districts | 2 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 77.89% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 19.34% |
| Native American | 0.17% |
| Hawaiin/Pacific Islander | 2.59% |