This was 38.2 percent lower than the state average of 41.9 percent. In 2020 the total municipality population reached 545.
55.2 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Old Hundred for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 145 | 44.8 |
| Regular high school diploma | 36 | 11.1 |
| GED or alternative credential | 0 | 0 |
| Some college, less than 1 year | 23 | 7.1 |
| Some college, 1 or more years, no degree | 108 | 33.3 |
| Associate's degree | 12 | 3.7 |
| Bachelor's degree | 0 | 0 |
| Master's degree | 0 | 0 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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