| Index | Walnut | California | National |
| Average Test Scores | 70% | 43% | 48% |
| Student/Teacher ratio | 22:1 | 20:1 | 16:1 |
| Total public schools | 12 | 8,308 | 79,221 |
| Total private schools | 10 | 3,438 | 24,874 |
| Total post-secondary schools | 2 | 1,085 | 7,963 |
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| Index | Walnut | California | National |
| Completed 8th grade | 92.5% | 81.1% | 84.3% |
| Completed high school | 91.8% | 79.8% | 83.0% |
| Completed some college | 79.1% | 61.5% | 59.4% |
| Completed associate degree | 62.7% | 39.8% | 38.5% |
| Completed bachelors | 51.1% | 32.0% | 30.3% |
| Completed masters | 14.2% | 11.9% | 11.5% |
| Completed professional degree | 4.2% | 3.9% | 3.3% |
| Completed doctorate | 1.6% | 1.6% | 1.3% |
There are a total of 12 public schools, 10 private schools and 2 post-secondary schools in Walnut. Using the proficiency score averages, the average test scores for Walnut, CA schools is 70%. The average student to teacher ratio is 22:1. In Walnut, CA, an average of 92.5% of students have completed 8th grade and an average of 91.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| San Marino, CA | 13,535 | 88% | 84.1% |
| Arcadia, CA | 59,066 | 74% | 53.2% |
| Yorba Linda, CA | 70,241 | 72% | 50.3% |
| Diamond Bar, CA | 57,925 | 67% | 39.8% |
| La Verne, CA | 33,460 | 67% | 39.2% |
| Walnut, CA | 30,544 | 70% | 44.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Suisun City, CA | 30,544 | 33% | 31.8% |
| Chicago Heights, IL | 30,540 | 23% | 52.6% |
| East Palo Alto, CA | 30,529 | 22% | 53.9% |
| Highland Park, IL | 30,564 | 57% | 18.6% |
| Texarkana, AR | 30,581 | 40% | 15.9% |
| Walnut, CA | 30,544 | 70% | 44.9% |
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