This was 23.1 percent lower than the state average of 48.4 percent. In 2020 the total municipality population reached 719.
77.2 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Walnut Grove for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 100 | 22.8 |
| Regular high school diploma | 99 | 22.6 |
| GED or alternative credential | 12 | 2.7 |
| Some college, less than 1 year | 30 | 6.8 |
| Some college, 1 or more years, no degree | 87 | 19.8 |
| Associate's degree | 47 | 10.7 |
| Bachelor's degree | 52 | 11.8 |
| Master's degree | 11 | 2.5 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 1 | 0.2 |

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