This was 2.7 percent lower than the state average of 43.7 percent. In 2020 the total municipality population reached 8,545.
91.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Manteno for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 486 | 8.2 |
| Regular high school diploma | 1,433 | 24.1 |
| GED or alternative credential | 150 | 2.5 |
| Some college, less than 1 year | 630 | 10.6 |
| Some college, 1 or more years, no degree | 811 | 13.6 |
| Associate's degree | 886 | 14.9 |
| Bachelor's degree | 1,061 | 17.8 |
| Master's degree | 369 | 6.2 |
| Professional school degree | 114 | 1.9 |
| Doctorate degree | 12 | 0.2 |
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