| Index | Markham | Illinois | National |
| Average Test Scores | 16% | 33% | 48% |
| Student/Teacher ratio | 16:1 | 18:1 | 16:1 |
| Total public schools | 5 | 3,938 | 79,221 |
| Total private schools | 1 | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |


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| Index | Markham | Illinois | National |
| Completed 8th grade | 80.3% | 86.2% | 84.3% |
| Completed high school | 79.5% | 84.7% | 83.0% |
| Completed some college | 48.6% | 61.8% | 59.4% |
| Completed associate degree | 21.1% | 40.7% | 38.5% |
| Completed bachelors | 12.9% | 32.9% | 30.3% |
| Completed masters | 4.7% | 12.7% | 11.5% |
| Completed professional degree | 0.7% | 3.4% | 3.3% |
| Completed doctorate | 0.3% | 1.2% | 1.3% |
There are a total of 5 public schools, 1 private schools and n/a post-secondary schools in Markham. Using the proficiency score averages, the average test scores for Markham, IL schools is 16%. The average student to teacher ratio is 16:1. In Markham, IL, an average of 80.3% of students have completed 8th grade and an average of 79.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Clarendon Hills, IL | 9,104 | 77% | 59.4% |
| Hinsdale, IL | 17,817 | 74% | 54.7% |
| Western Springs, IL | 13,775 | 74% | 54.4% |
| Munster, IN | 23,103 | 70% | 46.0% |
| Dyer, IN | 16,417 | 64% | 33.3% |
| Markham, IL | 12,759 | 16% | 66.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Fairfax Station, VA | 12,757 | 82% | 71.5% |
| Centralia, IL | 12,756 | 24% | 49.3% |
| Grenada, MS | 12,751 | 56% | 17.4% |
| Cambridge, MD | 12,776 | 24% | 49.4% |
| Mountain Home, AR | 12,739 | 50% | 4.4% |
| Markham, IL | 12,759 | 16% | 66.3% |