| Name | Marion County |
| State | Illinois |
| FIPS Code | 17121 |
| County Seat | Salem |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 39,319 |
| Population Growth Rate(2000-2022) | -4.33% |
| Majority Ethnicity | White 94.73% |
| Public School Majority Ethnicity | White 83% |
| Partisan Voting Index | Strongly Republican:+21 |
| Unemployment Rate (November 2024) | 4.9% |
| Area Code(s) | 618 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 94.73% |
| African American | 4.51% |
| Hispanic | 0.04% |
| Asian | 0.7% |
| Native American | 0.01% |
| Hawaiin/Pacific Islander | 0.01% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 83.42% |
| African American | 5.56% |
| Hispanic | 3.22% |
| Asian | 0.31% |
| Native American | 0.19% |
| Hawaiin/Pacific Islander | 0.11% |