- Latitude: 38°30'09" N (+38.5025)
- Longitude: 90°37'40" W (-90.6278)
- Land area: 10.1 square miles
- Water area: 0.06 square miles (39.0 acres)
As the crow flies, Eureka is...
| Year | Population | Percent change |
|---|
| 1960 | 1,134 | -- |
| 1970 | 2,384 | +110.2% |
| 1980 | 3,862 | +62.0% |
| 1990 | 4,683 | +21.3% |
| 2000 | 7,676 | +63.9% |