| Place Name | Eureka |
| Place Type | City |
| ZIP Code(s) | 67045 |
| County | Greenwood County |
| Area Code(s) | 620 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 2,608 |
| Population Growth Rate (2010-19) | -11.43% |
| Majority Ethnicity | White 91.7% |
| US Congressional District(s) | Kansas 4th |
| State House Districts | 13 |
| State Senate Districts | 14 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 91.7% |
| African American | 0.91% |
| Hispanic | 1.52% |
| Asian | 0.52% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 5.35% |