| Index | Harrisburg | Illinois | National |
| Average Test Scores | 21% | 33% | 48% |
| Student/Teacher ratio | 14:1 | 18:1 | 16:1 |
| Total public schools | 6 | 3,938 | 79,221 |
| Total private schools | 1 | 1,438 | 24,874 |
| Total post-secondary schools | 1 | 306 | 7,963 |
| Index | Harrisburg | Illinois | National |
| Completed 8th grade | 81.3% | 86.2% | 84.3% |
| Completed high school | 79.4% | 84.7% | 83.0% |
| Completed some college | 53.9% | 61.8% | 59.4% |
| Completed associate degree | 28.5% | 40.7% | 38.5% |
| Completed bachelors | 16.1% | 32.9% | 30.3% |
| Completed masters | 6.6% | 12.7% | 11.5% |
| Completed professional degree | 0.8% | 3.4% | 3.3% |
| Completed doctorate | 0.3% | 1.2% | 1.3% |
There are a total of 6 public schools, 1 private schools and 1 post-secondary schools in Harrisburg. Using the proficiency score averages, the average test scores for Harrisburg, IL schools is 21%. The average student to teacher ratio is 14:1. In Harrisburg, IL, an average of 81.3% of students have completed 8th grade and an average of 79.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Galatia, IL | 1,095 | 26% | 45.8% |
| Eldorado, IL | 4,000 | 24% | 49.7% |
| Thompsonville, IL | 527 | 19% | 61.5% |
| Carrier Mills, IL | 1,819 | 15% | 69.3% |
| Harrisburg, IL | 8,578 | 21% | 57.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Hailey, ID | 8,575 | 50% | 3.1% |
| Richmond Heights, MO | 8,581 | 50% | 3.1% |
| Signal Mountain, TN | 8,574 | 73% | 52.1% |
| Berthoud, CO | 8,574 | 59% | 22.1% |
| Mount Pleasant, IA | 8,574 | 65% | 34.9% |
| Harrisburg, IL | 8,578 | 21% | 57.3% |
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