| Index | Hardin | Illinois | National |
| Average Test Scores | 44% | 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 | Hardin | Illinois | National |
| Completed 8th grade | 84.1% | 86.2% | 84.3% |
| Completed high school | 78.9% | 84.7% | 83.0% |
| Completed some college | 35.4% | 61.8% | 59.4% |
| Completed associate degree | 19.7% | 40.7% | 38.5% |
| Completed bachelors | 11.0% | 32.9% | 30.3% |
| Completed masters | 4.6% | 12.7% | 11.5% |
| Completed professional degree | 1.1% | 3.4% | 3.3% |
| Completed doctorate | 1.1% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Hardin. Using the proficiency score averages, the average test scores for Hardin, IL schools is 44%. The average student to teacher ratio is n/a. In Hardin, IL, an average of 84.1% of students have completed 8th grade and an average of 78.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Grafton, IL | 672 | 65% | 35.4% |
| Elsberry, MO | 2,024 | 39% | 19.8% |
| Brussels, IL | 113 | 35% | 27.1% |
| Winfield, MO | 1,954 | 33% | 31.6% |
| Carrollton, IL | 2,590 | 29% | 40.6% |
| Hardin, IL | 831 | 44% | 7.8% |
| City | Population | Avg. Test Scores | National Avg. |
| Tilghman Island, MD | 831 | 65% | 35.4% |
| Pearl City, IL | 831 | 41% | 15.6% |
| Lamberton, MN | 831 | 65% | 34.9% |
| Annville, KY | 831 | 50% | 4.2% |
| Hanna, WY | 830 | 51% | 6.3% |
| Hardin, IL | 831 | 44% | 7.8% |
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