| Index | San Marino | California | National |
| Average Test Scores | 88% | 43% | 48% |
| Student/Teacher ratio | 21:1 | 20:1 | 16:1 |
| Total public schools | 4 | 8,308 | 79,221 |
| Total private schools | 3 | 3,438 | 24,874 |
| Total post-secondary schools | n/a | 1,085 | 7,963 |
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| Index | San Marino | California | National |
| Completed 8th grade | 95.2% | 81.1% | 84.3% |
| Completed high school | 95.0% | 79.8% | 83.0% |
| Completed some college | 88.7% | 61.5% | 59.4% |
| Completed associate degree | 75.4% | 39.8% | 38.5% |
| Completed bachelors | 71.7% | 32.0% | 30.3% |
| Completed masters | 39.3% | 11.9% | 11.5% |
| Completed professional degree | 19.5% | 3.9% | 3.3% |
| Completed doctorate | 6.1% | 1.6% | 1.3% |
There are a total of 4 public schools, 3 private schools and n/a post-secondary schools in San Marino. Using the proficiency score averages, the average test scores for San Marino, CA schools is 88%. The average student to teacher ratio is 21:1. In San Marino, CA, an average of 95.2% of students have completed 8th grade and an average of 95.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| La Cañada Flintridge, CA | 20,543 | 87% | 82.0% |
| South Pasadena, CA | 26,308 | 82% | 70.2% |
| Arcadia, CA | 59,066 | 74% | 53.2% |
| La Crescenta-Montrose, CA | 20,963 | 72% | 49.2% |
| Walnut, CA | 30,544 | 70% | 44.9% |
| San Marino, CA | 13,535 | 88% | 84.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Glenn Heights, TX | 13,529 | 42% | 11.7% |
| Avenal, CA | 13,541 | 26% | 45.6% |
| Coatesville, PA | 13,546 | 33% | 31.7% |
| Harrison, AR | 13,520 | 62% | 29.6% |
| Worthington, MN | 13,520 | 38% | 21.9% |
| San Marino, CA | 13,535 | 88% | 84.1% |
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