This was 21.9 percent lower than the state average of 43.7 percent. In 2020 the total municipality population reached 501.
92.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Cullom for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 26 | 7.2 |
| Regular high school diploma | 129 | 35.5 |
| GED or alternative credential | 20 | 5.5 |
| Some college, less than 1 year | 56 | 15.4 |
| Some college, 1 or more years, no degree | 53 | 14.6 |
| Associate's degree | 30 | 8.3 |
| Bachelor's degree | 23 | 6.3 |
| Master's degree | 22 | 6.1 |
| Professional school degree | 2 | 0.6 |
| Doctorate degree | 2 | 0.6 |
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