| Index | Diamond Bar | California | National |
| Average Test Scores | 67% | 43% | 48% |
| 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 67%. 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 | Population | Avg. Test Scores | National Avg. |
| Los Alamitos, CA | 11,521 | 82% | 70.1% |
| Arcadia, CA | 57,053 | 74% | 53.2% |
| Yorba Linda, CA | 68,103 | 72% | 50.3% |
| Cypress, CA | 49,137 | 71% | 47.5% |
| Walnut, CA | 29,764 | 70% | 44.9% |
| Diamond Bar, CA | 55,870 | 67% | 39.8% |
| City | Population | Avg. Test Scores | National Avg. |
| Commerce City, CO | 55,891 | 30% | 37.0% |
| New Brunswick, NJ | 55,992 | 27% | 43.7% |
| Pocatello, ID | 56,016 | 50% | 4.5% |
| Tinley Park, IL | 56,082 | 46% | 3.5% |
| Dearborn Heights, MI | 55,630 | 40% | 17.4% |
| Diamond Bar, CA | 55,870 | 67% | 39.8% |
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