| Index | Lake San Marcos | California | National |
| Average Test Scores | n/a | 43% | 48% |
| Student/Teacher ratio | n/a | 20:1 | 16:1 |
| Total public schools | n/a | 8,308 | 79,221 |
| Total private schools | n/a | 3,438 | 24,874 |
| Total post-secondary schools | n/a | 1,085 | 7,963 |
| Index | Lake San Marcos | California | National |
| Completed 8th grade | 95.2% | 81.1% | 84.3% |
| Completed high school | 92.9% | 79.8% | 83.0% |
| Completed some college | 82.2% | 61.5% | 59.4% |
| Completed associate degree | 57.6% | 39.8% | 38.5% |
| Completed bachelors | 38.4% | 32.0% | 30.3% |
| Completed masters | 13.3% | 11.9% | 11.5% |
| Completed professional degree | 6.2% | 3.9% | 3.3% |
| Completed doctorate | 3.0% | 1.6% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Lake San Marcos. Using the proficiency score averages, the average test scores for Lake San Marcos, CA schools is n/a. The average student to teacher ratio is n/a. In Lake San Marcos, CA, an average of 95.2% of students have completed 8th grade and an average of 92.9% 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% |
| Lake San Marcos, CA | 3,957 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Southgate, KY | 3,957 | 47% | 2.1% |
| Plains, PA | 3,958 | 42% | 12.5% |
| Ashland, MO | 3,956 | 48% | = 100 |
| Weaverville, NC | 3,956 | 56% | 16.0% |
| Wonder Lake, IL | 3,955 | 23% | 53.1% |
| Lake San Marcos, CA | 3,957 | n/a |
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