| Index | Marion | Illinois | National |
| Average Test Scores | 33% | 33% | 48% |
| Student/Teacher ratio | 17:1 | 18:1 | 16:1 |
| Total public schools | 8 | 3,938 | 79,221 |
| Total private schools | 2 | 1,438 | 24,874 |
| Total post-secondary schools | 1 | 306 | 7,963 |
| Index | Marion | Illinois | National |
| Completed 8th grade | 87.5% | 86.2% | 84.3% |
| Completed high school | 85.5% | 84.7% | 83.0% |
| Completed some college | 61.6% | 61.8% | 59.4% |
| Completed associate degree | 33.6% | 40.7% | 38.5% |
| Completed bachelors | 24.1% | 32.9% | 30.3% |
| Completed masters | 11.2% | 12.7% | 11.5% |
| Completed professional degree | 2.0% | 3.4% | 3.3% |
| Completed doctorate | 1.0% | 1.2% | 1.3% |
There are a total of 8 public schools, 2 private schools and 1 post-secondary schools in Marion. Using the proficiency score averages, the average test scores for Marion, IL schools is 33%. The average student to teacher ratio is 17:1. In Marion, IL, an average of 87.5% of students have completed 8th grade and an average of 85.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Carterville, IL | 5,861 | 53% | 10.9% |
| Creal Springs, IL | 473 | 42% | 12.5% |
| Herrin, IL | 12,806 | 36% | 24.7% |
| Goreville, IL | 1,120 | 32% | 33.3% |
| Pittsburg, IL | 842 | 25% | 49.0% |
| Marion, IL | 17,539 | 33% | 30.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Godfrey, IL | 17,540 | 21% | 56.3% |
| Lithia Springs, GA | 17,545 | 36% | 25.5% |
| Wantagh, NY | 17,548 | 75% | 56.1% |
| Manassas Park, VA | 17,548 | 73% | 52.1% |
| Centerville, UT | 17,527 | 61% | 26.5% |
| Marion, IL | 17,539 | 33% | 30.9% |
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