O'Fallon Township Illinois Profile
| Place Name | O'Fallon Township |
| Place Type | Township |
| ZIP Code(s) | 62234 62254 62269 62294 |
| County | Saint Clair County |
| Area Code(s) | 618 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 26,403 |
| Majority Ethnicity | White 77.57% |
| Metro/Micro Stats Area | St. Louis, MO-IL |
| US Congressional District(s) | Illinois 12th |
| State House Districts | 108,114 |
| State Senate Districts | 54,57 |
O'Fallon Township Race/Ethnicity Data
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 77.57% |
| African American | 15.18% |
| Hispanic | 0% |
| Asian | 2.84% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 4.41% |