| Index | Sullivan | Illinois | National |
| Average Test Scores | 29% | 33% | 48% |
| Student/Teacher ratio | 16:1 | 18:1 | 16:1 |
| Total public schools | 4 | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Sullivan | Illinois | National |
| Completed 8th grade | 82.4% | 86.2% | 84.3% |
| Completed high school | 78.6% | 84.7% | 83.0% |
| Completed some college | 50.7% | 61.8% | 59.4% |
| Completed associate degree | 26.8% | 40.7% | 38.5% |
| Completed bachelors | 15.9% | 32.9% | 30.3% |
| Completed masters | 5.5% | 12.7% | 11.5% |
| Completed professional degree | 1.3% | 3.4% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of 4 public schools, n/a private schools and n/a post-secondary schools in Sullivan. Using the proficiency score averages, the average test scores for Sullivan, IL schools is 29%. The average student to teacher ratio is 16:1. In Sullivan, IL, an average of 82.4% of students have completed 8th grade and an average of 78.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Shelbyville, IL | 4,198 | 44% | 8.3% |
| Mount Zion, IL | 5,707 | 44% | 8.9% |
| Mattoon, IL | 17,273 | 30% | 37.2% |
| Atwood, IL | 1,126 | 30% | 38.5% |
| Arthur, IL | 2,180 | 29% | 39.1% |
| Sullivan, IL | 4,450 | 29% | 39.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Saukville, WI | 4,448 | 75% | 55.2% |
| Montoursville, PA | 4,452 | 70% | 45.6% |
| Millsboro, DE | 4,448 | 60% | 25.3% |
| Florence, MS | 4,446 | 50% | 5.0% |
| Orangeburg, NY | 4,454 | 98% | 103.1% |
| Sullivan, IL | 4,450 | 29% | 39.2% |
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