| Place Name | St. Johns |
| Place Type | Village |
| ZIP Code(s) | 62832 |
| County | Perry County |
| Area Code(s) | 618 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 164 |
| Population Growth Rate (2010-19) | -25.57% |
| Majority Ethnicity | White 92.05% |
| US Congressional District(s) | Illinois 12th |
| State House Districts | 115 |
| State Senate Districts | 58 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 92.05% |
| African American | 3.97% |
| Hispanic | 0.66% |
| Asian | 3.31% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |