This was 19.1 percent higher than the state average of 42.7 percent. In 2020 the total municipality population reached 55,870.
93.6 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Diamond Bar city for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 2,612 | 6.4 |
| Regular high school diploma | 5,191 | 12.8 |
| GED or alternative credential | 694 | 1.7 |
| Some college, less than 1 year | 2,060 | 5.1 |
| Some college, 1 or more years, no degree | 4,963 | 12.2 |
| Associate's degree | 3,180 | 7.8 |
| Bachelor's degree | 14,401 | 35.4 |
| Master's degree | 5,145 | 12.7 |
| Professional school degree | 1,458 | 3.6 |
| Doctorate degree | 936 | 2.3 |
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