| Place Name | Jennings |
| Place Type | City |
| ZIP Code(s) | 63121 63135 63136 63137 |
| County | Saint Louis County |
| Area Code(s) | 314 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 14,741 |
| Population Growth Rate (2010-19) | -12.35% |
| Majority Ethnicity | African American 91.26% |
| Metro/Micro Stats Area | St. Louis, MO-IL |
| US Congressional District(s) | Missouri 1st |
| State House Districts | 74,75 |
| State Senate Districts | 14 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 7.53% |
| African American | 91.26% |
| Hispanic | 0.42% |
| Asian | 0.19% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.61% |