| Place Name | Mount Vernon |
| Place Type | City |
| ZIP Code(s) | 62864 |
| County | Jefferson County |
| Area Code(s) | 618 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 15,051 |
| Population Growth Rate (2010-19) | -4.43% |
| Majority Ethnicity | White 77.59% |
| Metro/Micro Stats Area | Mount Vernon, IL |
| US Congressional District(s) | Illinois 12th |
| State House Districts | 115 |
| State Senate Districts | 58 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 77.59% |
| African American | 16.62% |
| Hispanic | 0.24% |
| Asian | 1.6% |
| Native American | 0.06% |
| Hawaiin/Pacific Islander | 3.9% |