| Index | Marathon | Florida | National |
| Average Test Scores | 60% | 55% | 48% |
| Student/Teacher ratio | 16:1 | 17:1 | 16:1 |
| Total public schools | 2 | 3,388 | 79,221 |
| Total private schools | 1 | 1,640 | 24,874 |
| Total post-secondary schools | n/a | 466 | 7,963 |
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| Index | Marathon | Florida | National |
| Completed 8th grade | 87.6% | 84.0% | 84.3% |
| Completed high school | 87.2% | 83.0% | 83.0% |
| Completed some college | 57.8% | 58.0% | 59.4% |
| Completed associate degree | 33.9% | 37.4% | 38.5% |
| Completed bachelors | 24.8% | 27.9% | 30.3% |
| Completed masters | 7.5% | 10.0% | 11.5% |
| Completed professional degree | 3.0% | 3.1% | 3.3% |
| Completed doctorate | 1.3% | 1.1% | 1.3% |
There are a total of 2 public schools, 1 private schools and n/a post-secondary schools in Marathon. Using the proficiency score averages, the average test scores for Marathon, FL schools is 60%. The average student to teacher ratio is 16:1. In Marathon, FL, an average of 87.6% of students have completed 8th grade and an average of 87.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Marathon, FL | 8,934 | 60% | 24.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Stuttgart, AR | 8,933 | 37% | 23.7% |
| Graham, TX | 8,936 | 46% | 4.2% |
| Hanover, NH | 8,927 | 82% | 70.5% |
| Brigantine, NJ | 8,944 | 46% | 4.2% |
| Lapeer, MI | 8,922 | 45% | 5.7% |
| Marathon, FL | 8,934 | 60% | 24.0% |
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