| Index | Harmon | 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 | Harmon | Illinois | National |
| Completed 8th grade | 83.8% | 86.2% | 84.3% |
| Completed high school | 82.9% | 84.7% | 83.0% |
| Completed some college | 34.2% | 61.8% | 59.4% |
| Completed associate degree | 10.3% | 40.7% | 38.5% |
| Completed bachelors | 2.6% | 32.9% | 30.3% |
| Completed masters | 0.0% | 12.7% | 11.5% |
| Completed professional degree | 0.0% | 3.4% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Harmon. Using the proficiency score averages, the average test scores for Harmon, IL schools is n/a. The average student to teacher ratio is n/a. In Harmon, IL, an average of 83.8% of students have completed 8th grade and an average of 82.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Ohio, IL | 509 | 48% | 1.0% |
| Tampico, IL | 771 | 35% | 28.1% |
| Rock Falls, IL | 8,914 | 30% | 37.1% |
| Amboy, IL | 2,453 | 30% | 37.2% |
| Sterling, IL | 14,774 | 28% | 41.7% |
| Harmon, IL | 146 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Downsville, LA | 146 | 69% | 43.8% |
| Crossnore, NC | 146 | 33% | 30.7% |
| Chinese Camp, CA | 146 | 60% | 25.0% |
| Cloverdale, OR | 146 | 42% | 12.5% |
| Laredo, MO | 147 | 70% | 45.8% |
| Harmon, IL | 146 | n/a |
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