This was 12.2 percent lower than the state average of 36 percent. In 2020 the total municipality population reached 230.
80.4 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Tennyson for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 28 | 19.6 |
| Regular high school diploma | 58 | 40.6 |
| GED or alternative credential | 11 | 7.7 |
| Some college, less than 1 year | 4 | 2.8 |
| Some college, 1 or more years, no degree | 8 | 5.6 |
| Associate's degree | 14 | 9.8 |
| Bachelor's degree | 20 | 14 |
| Master's degree | 0 | 0 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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