| Index | San Marcos | Texas | National |
| Average Test Scores | 32% | 47% | 48% |
| Student/Teacher ratio | 15:1 | 14:1 | 16:1 |
| Total public schools | 13 | 7,418 | 79,221 |
| Total private schools | 6 | 1,267 | 24,874 |
| Total post-secondary schools | 1 | 463 | 7,963 |
| Index | San Marcos | Texas | National |
| Completed 8th grade | 81.5% | 79.3% | 84.3% |
| Completed high school | 80.8% | 77.8% | 83.0% |
| Completed some college | 60.1% | 57.3% | 59.4% |
| Completed associate degree | 37.7% | 34.9% | 38.5% |
| Completed bachelors | 32.0% | 28.1% | 30.3% |
| Completed masters | 11.0% | 9.6% | 11.5% |
| Completed professional degree | 3.4% | 2.6% | 3.3% |
| Completed doctorate | 2.1% | 1.1% | 1.3% |
There are a total of 13 public schools, 6 private schools and 1 post-secondary schools in San Marcos. Using the proficiency score averages, the average test scores for San Marcos, TX schools is 32%. The average student to teacher ratio is 15:1. In San Marcos, TX, an average of 81.5% of students have completed 8th grade and an average of 80.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| New Braunfels, TX | 84,622 | 56% | 16.1% |
| Buda, TX | 16,484 | 50% | 4.5% |
| Wimberley, TX | 3,168 | 49% | 2.1% |
| Kyle, TX | 45,828 | 41% | 13.7% |
| Niederwald, TX | 652 | 39% | 18.8% |
| San Marcos, TX | 64,053 | 32% | 33.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Cheyenne, WY | 64,099 | 47% | 1.5% |
| Bellevue, NE | 63,970 | 52% | 7.7% |
| Youngstown, OH | 64,152 | 44% | 7.4% |
| Lake Elsinore, CA | 64,201 | 34% | 28.7% |
| Dublin, CA | 63,856 | 72% | 49.3% |
| San Marcos, TX | 64,053 | 32% | 33.1% |
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