This was 17.3 percent lower than the state average of 31.4 percent. In 2020 the total municipality population reached 1,852.
94.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Killian for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 85 | 5.2 |
| Regular high school diploma | 597 | 36.8 |
| GED or alternative credential | 56 | 3.5 |
| Some college, less than 1 year | 40 | 2.5 |
| Some college, 1 or more years, no degree | 615 | 37.9 |
| Associate's degree | 45 | 2.8 |
| Bachelor's degree | 114 | 7 |
| Master's degree | 51 | 3.1 |
| Professional school degree | 9 | 0.6 |
| Doctorate degree | 9 | 0.6 |

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