| Place Name | St. John Township |
| Place Type | Township |
| County | Lake County |
| Area Code(s) | 219 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 68,519 |
| Majority Ethnicity | White 80.3% |
| Metro/Micro Stats Area | Chicago-Naperville-Elgin, IL-IN-WI |
| US Congressional District(s) | Indiana 1st |
| State House Districts | 11,15 |
| State Senate Districts | 1,6 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 80.3% |
| African American | 5.2% |
| Hispanic | 0.18% |
| Asian | 2.26% |
| Native American | 0.01% |
| Hawaiin/Pacific Islander | 12.05% |