| Place Name | Eureka |
| Place Type | Census Designated Place |
| ZIP Code(s) | 54923 54963 |
| County | Winnebago County |
| Area Code(s) | 274,920 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 157 |
| Population Growth Rate (2010-19) | 12.27% |
| Majority Ethnicity | White 92.31% |
| Metro/Micro Stats Area | Oshkosh-Neenah, WI |
| US Congressional District(s) | Wisconsin 6th |
| State Assembly Districts | 53 |
| State Senate Districts | 18 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 92.31% |
| African American | 3.3% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 4.4% |