This was 6.1 percent higher than the state average of 47.7 percent. In 2020 the total municipality population reached 1,653.
91.5 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Spencerville for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 94 | 8.5 |
| Regular high school diploma | 139 | 12.6 |
| GED or alternative credential | 36 | 3.3 |
| Some college, less than 1 year | 49 | 4.4 |
| Some college, 1 or more years, no degree | 191 | 17.3 |
| Associate's degree | 87 | 7.9 |
| Bachelor's degree | 243 | 22.1 |
| Master's degree | 206 | 18.7 |
| Professional school degree | 27 | 2.5 |
| Doctorate degree | 30 | 2.7 |
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