| 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% |
Here are the best places to live in California
Check out the 10 safest cities in California
See the best places to live in San Marcos
Most Dangerous Cities In The US