| Place Name | St. John Township |
| Place Type | Township |
| ZIP Code(s) | 51555 |
| County | Harrison County |
| Area Code(s) | 712 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 4,065 |
| Majority Ethnicity | White 98.95% |
| Metro/Micro Stats Area | Omaha-Council Bluffs, NE-IA |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 17 |
| State Senate Districts | 9 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 98.95% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1.05% |