| Index | San Marcos | California | National |
| Average Test Scores | 50% | 43% | 48% |
| Student/Teacher ratio | 24:1 | 20:1 | 16:1 |
| Total public schools | 14 | 8,308 | 79,221 |
| Total private schools | 5 | 3,438 | 24,874 |
| Total post-secondary schools | 6 | 1,085 | 7,963 |
| Index | San Marcos | California | National |
| Completed 8th grade | 83.4% | 81.1% | 84.3% |
| Completed high school | 82.3% | 79.8% | 83.0% |
| Completed some college | 65.1% | 61.5% | 59.4% |
| Completed associate degree | 45.4% | 39.8% | 38.5% |
| Completed bachelors | 32.3% | 32.0% | 30.3% |
| Completed masters | 10.4% | 11.9% | 11.5% |
| Completed professional degree | 2.4% | 3.9% | 3.3% |
| Completed doctorate | 0.9% | 1.6% | 1.3% |
There are a total of 14 public schools, 5 private schools and 6 post-secondary schools in San Marcos. Using the proficiency score averages, the average test scores for San Marcos, CA schools is 50%. The average student to teacher ratio is 24:1. In San Marcos, CA, an average of 83.4% of students have completed 8th grade and an average of 82.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Del Mar, CA | 4,331 | 86% | 79.2% |
| Rancho Santa Fe, CA | 2,657 | 85% | 76.7% |
| Solana Beach, CA | 13,301 | 71% | 48.7% |
| Carlsbad, CA | 114,411 | 70% | 46.5% |
| Encinitas, CA | 62,967 | 65% | 35.0% |
| San Marcos, CA | 96,219 | 50% | 3.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Sandy, UT | 96,137 | 58% | 19.8% |
| Flint, MI | 95,999 | 24% | 49.4% |
| Longmont, CO | 95,864 | 41% | 14.5% |
| Riverview, FL | 95,849 | 54% | 12.0% |
| Erie, PA | 96,616 | 47% | 1.2% |
| San Marcos, CA | 96,219 | 50% | 3.5% |
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