This number was 21.6 percent higher than the state average of 41.8 percent. In 2019 the total municipality population reached 56,211.
94.2 percent of the population had at least a high school diploma or the equivalent. The table below shows how many Diamond Bar city residents who were at least 25 years old in 2019 held each of the listed degrees.
Degree distribution in Diamond Bar city for 2019*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 2,369 | 5.8 |
| Regular high school diploma | 5,270 | 12.9 |
| GED or alternative credential | 659 | 1.6 |
| Some college, less than 1 year | 1,601 | 3.9 |
| Some college, 1 or more years, no degree | 5,018 | 12.3 |
| Associate's degree | 3,497 | 8.6 |
| Bachelor's degree | 14,612 | 35.8 |
| Master's degree | 5,182 | 12.7 |
| Professional school degree | 1,637 | 4 |
| Doctorate degree | 965 | 2.4 |
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