This was 30.5 percent lower than the state average of 38.7 percent. In 2020 the total municipality population reached 190.
73.5 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Ruby city for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 26 | 26.5 |
| Regular high school diploma | 43 | 43.9 |
| GED or alternative credential | 2 | 2 |
| Some college, less than 1 year | 4 | 4.1 |
| Some college, 1 or more years, no degree | 15 | 15.3 |
| Associate's degree | 1 | 1 |
| Bachelor's degree | 2 | 2 |
| Master's degree | 5 | 5.1 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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