| Name | Saint Louis County |
| State | Missouri |
| FIPS Code | 29189 |
| County Seat | Clayton |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 999,147 |
| Population Growth Rate(2020-2022) | 0.52% |
| Majority Ethnicity | White 65.81% |
| Public School Majority Ethnicity | White 49% |
| Partisan Voting Index | Democratic:+11 |
| Unemployment Rate (May 2026) | 4.4% |
| Area Code(s) | 314 / 557 / 636 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 65.81% |
| African American | 25.24% |
| Hispanic | 3.9% |
| Asian | 4.91% |
| Native American | 0.11% |
| Hawaiin/Pacific Islander | 0.02% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 48.61% |
| African American | 34.23% |
| Hispanic | 5.78% |
| Asian | 5.47% |
| Native American | 0.2% |
| Hawaiin/Pacific Islander | 0.07% |