| Place Name | St. John |
| Place Type | Town |
| ZIP Code(s) | 46303 46307 46311 46373 46375 |
| County | Lake County |
| Area Code(s) | 219 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 14,753 |
| Population Growth Rate (2010-19) | 36.72% |
| Majority Ethnicity | White 84.39% |
| Metro/Micro Stats Area | Chicago-Naperville-Elgin, IL-IN-WI |
| US Congressional District(s) | Indiana 1st |
| State House Districts | 11,15 |
| State Senate Districts | 6 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 84.39% |
| African American | 2.54% |
| Hispanic | 0.16% |
| Asian | 2.11% |
| Native American | 0.07% |
| Hawaiin/Pacific Islander | 10.73% |