| 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 |
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| 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 | 589 | 75% | 56.3% |
| Sioux Rapids, IA | 920 | 71% | 48.6% |
| Laurens, IA | 1,196 | 60% | 25.0% |
| Storm Lake, IA | 10,508 | 55% | 14.2% |
| Marathon, IA | 183 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Kelly, WY | 183 | 70% | 45.8% |
| Washta, IA | 183 | 67% | 39.6% |
| Litchfield, CA | 183 | 35% | 28.1% |
| Medicine Lake, MT | 183 | 50% | 4.2% |
| Hobson, MT | 183 | 53% | 11.1% |
| Marathon, IA | 183 | n/a |
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