| Index | Diamond Bar | California | National |
| Average Test Scores | 60% | 38% | 49% |
| Student/Teacher ratio | 23:1 | 20:1 | 16:1 |
| Total public schools | 11 | 8,308 | 79,221 |
| Total private schools | 7 | 3,438 | 24,874 |
| Total post-secondary schools | n/a | 1,085 | 7,963 |
| Index | Diamond Bar | California | National |
| Completed 8th grade | 91.4% | 81.1% | 84.3% |
| Completed high school | 91.1% | 79.8% | 83.0% |
| Completed some college | 77.8% | 61.5% | 59.4% |
| Completed associate degree | 59.0% | 39.8% | 38.5% |
| Completed bachelors | 50.7% | 32.0% | 30.3% |
| Completed masters | 17.2% | 11.9% | 11.5% |
| Completed professional degree | 5.7% | 3.9% | 3.3% |
| Completed doctorate | 2.0% | 1.6% | 1.3% |
There are a total of 11 public schools, 7 private schools and n/a post-secondary schools in Diamond Bar. Using the proficiency score averages, the average test scores for Diamond Bar, CA schools is 60%. The average student to teacher ratio is 23:1. In Diamond Bar, CA, an average of 91.4% of students have completed 8th grade and an average of 91.1% have completed high school.
| City, State | Population | Avg. Test Scores | National Avg. |
| Rossmoor, CA | 10,933 | 79% | 61% |
| Arcadia, CA | 57,755 | 76% | 54% |
| Yorba Linda, CA | 67,362 | 67% | 37% |
| Cypress, CA | 48,978 | 67% | 36% |
| Walnut, CA | 30,026 | 66% | 35% |
| Diamond Bar, CA | 56,456 | 60% | 21% |
| City, State | Population | Avg. Test Scores | National Avg. |
| New Brunswick, NJ | 56,427 | 20% | 59% |
| Berwyn, IL | 56,414 | 22% | 56% |
| Taunton, MA | 56,504 | 51% | 3% |
| Dearborn Heights, MI | 56,329 | 40% | 19% |
| Lehi, UT | 56,314 | 50% | 1% |
| Diamond Bar, CA | 56,456 | 60% | 21% |
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