| Index | Calhoun | 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 |
| Index | Calhoun | Illinois | National |
| Completed 8th grade | 72.4% | 86.2% | 84.3% |
| Completed high school | 71.1% | 84.7% | 83.0% |
| Completed some college | 58.6% | 61.8% | 59.4% |
| Completed associate degree | 40.1% | 40.7% | 38.5% |
| Completed bachelors | 5.3% | 32.9% | 30.3% |
| Completed masters | 0.7% | 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 Calhoun. Using the proficiency score averages, the average test scores for Calhoun, IL schools is n/a. The average student to teacher ratio is n/a. In Calhoun, IL, an average of 72.4% of students have completed 8th grade and an average of 71.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| West Salem, IL | 872 | 52% | 8.3% |
| Sumner, IL | 2,916 | 45% | 7.3% |
| Mount Erie, IL | 114 | 40% | 16.7% |
| Olney, IL | 8,872 | 29% | 40.6% |
| Calhoun, IL | 149 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Starr, SC | 149 | 57% | 18.8% |
| Boones Mill, VA | 149 | 87% | 81.3% |
| San Lorenzo, NM | 149 | 55% | 14.6% |
| Blairsburg, IA | 149 | 70% | 45.8% |
| Clearmont, WY | 148 | 65% | 35.4% |
| Calhoun, IL | 149 | n/a |
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