| Index | Marion | Iowa | National |
| Average Test Scores | 77% | 69% | 48% |
| Student/Teacher ratio | 14:1 | 13:1 | 16:1 |
| Total public schools | 11 | 1,101 | 79,221 |
| Total private schools | 2 | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
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| Index | Marion | Iowa | National |
| Completed 8th grade | 92.7% | 89.2% | 84.3% |
| Completed high school | 92.3% | 87.7% | 83.0% |
| Completed some college | 69.3% | 59.8% | 59.4% |
| Completed associate degree | 47.3% | 38.4% | 38.5% |
| Completed bachelors | 34.2% | 27.2% | 30.3% |
| Completed masters | 10.1% | 8.7% | 11.5% |
| Completed professional degree | 1.6% | 2.7% | 3.3% |
| Completed doctorate | 0.7% | 1.1% | 1.3% |
There are a total of 11 public schools, 2 private schools and n/a post-secondary schools in Marion. Using the proficiency score averages, the average test scores for Marion, IA schools is 77%. The average student to teacher ratio is 14:1. In Marion, IA, an average of 92.7% of students have completed 8th grade and an average of 92.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Center Point, IA | 2,548 | 86% | 78.6% |
| Mount Vernon, IA | 4,487 | 82% | 71.5% |
| Shellsburg, IA | 806 | 82% | 70.8% |
| Robins, IA | 3,510 | 81% | 67.7% |
| Atkins, IA | 2,069 | 77% | 60.4% |
| Marion, IA | 39,910 | 77% | 59.8% |
| City | Population | Avg. Test Scores | National Avg. |
| Streamwood, IL | 39,917 | 26% | 46.6% |
| Friendswood, TX | 39,893 | 64% | 32.5% |
| Chelsea, MA | 39,878 | 37% | 23.6% |
| The Acreage, FL | 39,863 | 71% | 46.9% |
| Calexico, CA | 39,841 | 26% | 46.2% |
| Marion, IA | 39,910 | 77% | 59.8% |
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