| Index | Marathon | Iowa | National |
| Average Test Scores | n/a | 69% | 48% |
| Student/Teacher ratio | n/a | 13:1 | 16:1 |
| Total public schools | n/a | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | Marathon | Iowa | National |
| Completed 8th grade | 75.3% | 89.2% | 84.3% |
| Completed high school | 72.6% | 87.7% | 83.0% |
| Completed some college | 42.5% | 59.8% | 59.4% |
| Completed associate degree | 17.2% | 38.4% | 38.5% |
| Completed bachelors | 9.7% | 27.2% | 30.3% |
| Completed masters | 1.6% | 8.7% | 11.5% |
| Completed professional degree | 0.0% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Marathon. Using the proficiency score averages, the average test scores for Marathon, IA schools is n/a. The average student to teacher ratio is n/a. In Marathon, IA, an average of 75.3% of students have completed 8th grade and an average of 72.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Albert City, IA | 605 | 75% | 56.3% |
| Sioux Rapids, IA | 940 | 71% | 48.6% |
| Laurens, IA | 1,222 | 60% | 25.0% |
| Storm Lake, IA | 10,898 | 55% | 14.2% |
| Marathon, IA | 187 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Wimbledon, ND | 187 | 54% | 11.5% |
| Poneto, IN | 186 | 51% | 6.8% |
| Camptonville, CA | 186 | 65% | 35.4% |
| Litchfield, CA | 188 | 35% | 28.1% |
| Fort Apache, AZ | 188 | 5% | 89.6% |
| Marathon, IA | 187 | n/a |
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