This was 11.9 percent lower than the state average of 38 percent. In 2020 the total municipality population reached 1,481.
87.2 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Tarkio for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 133 | 12.8 |
| Regular high school diploma | 360 | 34.5 |
| GED or alternative credential | 68 | 6.5 |
| Some college, less than 1 year | 102 | 9.8 |
| Some college, 1 or more years, no degree | 107 | 10.3 |
| Associate's degree | 38 | 3.6 |
| Bachelor's degree | 173 | 16.6 |
| Master's degree | 42 | 4 |
| Professional school degree | 15 | 1.4 |
| Doctorate degree | 4 | 0.4 |
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