This was 20.6 percent higher than the state average of 42.7 percent. In 2020 the total municipality population reached 29,764.
92.5 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Walnut city for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 1,654 | 7.5 |
| Regular high school diploma | 2,626 | 11.9 |
| GED or alternative credential | 292 | 1.3 |
| Some college, less than 1 year | 820 | 3.7 |
| Some college, 1 or more years, no degree | 2,702 | 12.2 |
| Associate's degree | 1,857 | 8.4 |
| Bachelor's degree | 8,474 | 38.4 |
| Master's degree | 2,421 | 11 |
| Professional school degree | 843 | 3.8 |
| Doctorate degree | 369 | 1.7 |

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