This was 2.9 percent lower than the state average of 43.2 percent. In 2020 the total municipality population reached 881.
95.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Arnold for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 23 | 4.2 |
| Regular high school diploma | 142 | 25.8 |
| GED or alternative credential | 13 | 2.4 |
| Some college, less than 1 year | 75 | 13.6 |
| Some college, 1 or more years, no degree | 76 | 13.8 |
| Associate's degree | 73 | 13.2 |
| Bachelor's degree | 109 | 19.8 |
| Master's degree | 26 | 4.7 |
| Professional school degree | 5 | 0.9 |
| Doctorate degree | 9 | 1.6 |

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