| Place Name | Vandalia |
| Place Type | City |
| ZIP Code(s) | 62471 |
| County | Fayette County |
| Area Code(s) | 618 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 6,096 |
| Population Growth Rate (2010-19) | 5.91% |
| Majority Ethnicity | White 80.72% |
| US Congressional District(s) | Illinois 15th |
| State House Districts | 107 |
| State Senate Districts | 54 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 80.72% |
| African American | 13.45% |
| Hispanic | 0.31% |
| Asian | 0.04% |
| Native American | 0.18% |
| Hawaiin/Pacific Islander | 5.28% |