| Name | Marion County |
| State | Illinois |
| FIPS Code | 17121 |
| County Seat | Salem |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 36,640 |
| Population Growth Rate(2020-2024) | -3% |
| Majority Ethnicity | White 92.75% |
| Public School Majority Ethnicity | White 83% |
| Partisan Voting Index | Strongly Republican:+25 |
| Unemployment Rate (May 2026) | 5.5% |
| Sales Tax Rate (2025) | 7.5% |
| Area Code(s) | 618 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 92.75% |
| African American | 4.32% |
| Hispanic | 2.2% |
| Asian | 0.69% |
| Native American | 0.02% |
| Hawaiin/Pacific Islander | 0.02% |
| 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% |