| Official Name: | Eureka Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Kansas |
| Subdivision Type2: | County |
| Subdivision Name2: | Barton |
| Area Total Km2: | 93.49 |
| Area Land Km2: | 93.27 |
| Area Water Km2: | 0.22 |
| Area Total Sq Mi: | 36.1 |
| Area Land Sq Mi: | 36.01 |
| Area Water Sq Mi: | 0.09 |
| Area Water Percent: | 0.24 |
| Population As Of: | 2010 |
| Population Total: | 82 |
| Population Density Km2: | auto |
| Elevation M: | 586 |
| Elevation Ft: | 1923 |
| Coordinates: | 38.4778°N -98.8669°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0475642 |
Eureka Township is a township in Barton County, Kansas, USA. As of the 2010 census, its population was 82.[1]
Eureka Township was organized in 1878.[2]
Eureka Township covers an area of 36.1sqmi and contains no incorporated settlements. According to the USGS, it contains one cemetery, Walnut Valley.