| Place Name | St. Elmo |
| Place Type | City |
| ZIP Code(s) | 62458 |
| County | Fayette County |
| Area Code(s) | 618 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 1,558 |
| Population Growth Rate (2010-19) | -12.06% |
| Majority Ethnicity | White 99.17% |
| US Congressional District(s) | Illinois 15th |
| State House Districts | 107 |
| State Senate Districts | 54 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 99.17% |
| African American | 0.39% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.45% |