This was 11.2 percent lower than the state average of 42.7 percent. In 2020 the total municipality population reached 41,656.
87.9 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Oakley city for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 3,147 | 12.1 |
| Regular high school diploma | 6,251 | 24 |
| GED or alternative credential | 1,192 | 4.6 |
| Some college, less than 1 year | 2,485 | 9.6 |
| Some college, 1 or more years, no degree | 4,742 | 18.2 |
| Associate's degree | 2,958 | 11.4 |
| Bachelor's degree | 3,731 | 14.3 |
| Master's degree | 1,058 | 4.1 |
| Professional school degree | 394 | 1.5 |
| Doctorate degree | 55 | 0.2 |
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