| Index | Mark | Illinois | National |
| Average Test Scores | n/a | 33% | 48% |
| Student/Teacher ratio | n/a | 18:1 | 16:1 |
| Total public schools | n/a | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
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| Index | Mark | Illinois | National |
| Completed 8th grade | 91.9% | 86.2% | 84.3% |
| Completed high school | 91.4% | 84.7% | 83.0% |
| Completed some college | 54.9% | 61.8% | 59.4% |
| Completed associate degree | 21.1% | 40.7% | 38.5% |
| Completed bachelors | 12.0% | 32.9% | 30.3% |
| Completed masters | 3.7% | 12.7% | 11.5% |
| Completed professional degree | 1.5% | 3.4% | 3.3% |
| Completed doctorate | 0.5% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Mark. Using the proficiency score averages, the average test scores for Mark, IL schools is n/a. The average student to teacher ratio is n/a. In Mark, IL, an average of 91.9% of students have completed 8th grade and an average of 91.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Dalzell, IL | 628 | 55% | 14.6% |
| Cherry, IL | 479 | 50% | 4.2% |
| Lostant, IL | 463 | 45% | 6.3% |
| Peru, IL | 9,777 | 39% | 19.8% |
| Princeton, IL | 7,589 | 33% | 30.9% |
| Mark, IL | 534 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Truro, IA | 534 | 68% | 40.6% |
| Dix, IL | 534 | 22% | 54.2% |
| Picacho, AZ | 534 | 17% | 64.6% |
| St. Francis, SD | 533 | 3% | 93.8% |
| Kanopolis, KS | 533 | 52% | 8.3% |
| Mark, IL | 534 | n/a |
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