| Place Name | St. Jacob Township |
| Place Type | Township |
| ZIP Code(s) | 62061 62249 62281 62293 |
| County | Madison County |
| Area Code(s) | 618 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 2,885 |
| Majority Ethnicity | White 98.06% |
| Metro/Micro Stats Area | St. Louis, MO-IL |
| US Congressional District(s) | Illinois 15th |
| State House Districts | 108 |
| State Senate Districts | 54 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 98.06% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0.17% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1.77% |