| 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% |
Here are the best places to live in California
Check out the 10 most dangerous cities in California
See the best places to live in Diamond Bar
These are the 10 cheapest cities in California