| Official Name: | Eureka, Perry County, Missouri |
| Settlement Type: | unincorporated community |
| Mapsize: | 250x200px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Missouri |
| Subdivision Type2: | County |
| Subdivision Name2: | Perry |
| Subdivision Type3: | Township |
| Subdivision Name3: | Cinque Hommes |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 640 |
| Coordinates: | 37.6789°N -89.7369°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 63775 |
| Area Code: | 573 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 736426 |
Eureka is an unincorporated community in Cinque Hommes Township in Perry County, Missouri, United States.[1] Eureka lies approximately eight miles east of Perryville, and about one mile east of Longtown.[2] Eureka was named after the nearby school.