This was 6.8 percent lower than the state average of 39.2 percent. In 2020 the total municipality population reached 667.
87.9 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Yarnell CDP for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 79 | 12.1 |
| Regular high school diploma | 109 | 16.7 |
| GED or alternative credential | 23 | 3.5 |
| Some college, less than 1 year | 73 | 11.2 |
| Some college, 1 or more years, no degree | 157 | 24.1 |
| Associate's degree | 69 | 10.6 |
| Bachelor's degree | 85 | 13 |
| Master's degree | 32 | 4.9 |
| Professional school degree | 5 | 0.8 |
| Doctorate degree | 20 | 3.1 |
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