| Name | Saint Clair County |
| State | Illinois |
| FIPS Code | 17163 |
| County Seat | Belleville |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 268,873 |
| Population Growth Rate(2000-2022) | -4.69% |
| Majority Ethnicity | White 67.14% |
| Public School Majority Ethnicity | White 46% |
| Partisan Voting Index | Democratic:+5 |
| Unemployment Rate (November 2024) | 4.7% |
| Area Code(s) | 618 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 67.14% |
| African American | 30.72% |
| Hispanic | 0.39% |
| Asian | 1.7% |
| Native American | 0.03% |
| Hawaiin/Pacific Islander | 0.03% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 45.56% |
| African American | 41.08% |
| Hispanic | 5.35% |
| Asian | 1.21% |
| Native American | 0.15% |
| Hawaiin/Pacific Islander | 0.16% |