This was 10.6 percent lower than the state average of 41.1 percent. In 2020 the total municipality population reached 2,599.
87.7 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Sibley for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 213 | 12.3 |
| Regular high school diploma | 529 | 30.6 |
| GED or alternative credential | 101 | 5.8 |
| Some college, less than 1 year | 129 | 7.5 |
| Some college, 1 or more years, no degree | 229 | 13.2 |
| Associate's degree | 264 | 15.3 |
| Bachelor's degree | 170 | 9.8 |
| Master's degree | 50 | 2.9 |
| Professional school degree | 33 | 1.9 |
| Doctorate degree | 11 | 0.6 |

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