| Place Name | Eureka |
| Place Type | City |
| ZIP Code(s) | 63025 |
| County | Saint Louis County Jefferson County |
| Area Code(s) | 636 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 10,122 |
| Population Growth Rate (2010-19) | 14.30% |
| Majority Ethnicity | White 95.42% |
| Metro/Micro Stats Area | St. Louis, MO-IL |
| US Congressional District(s) | Missouri 2ndMissouri 3rd |
| State House Districts | 110,111 |
| State Senate Districts | 22,26 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 95.42% |
| African American | 0.71% |
| Hispanic | 0.01% |
| Asian | 2.78% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1.08% |