| Index | Gillespie | Illinois | National |
| Average Test Scores | 32% | 33% | 48% |
| Student/Teacher ratio | 17:1 | 18:1 | 16:1 |
| Total public schools | 3 | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Gillespie | Illinois | National |
| Completed 8th grade | 84.4% | 86.2% | 84.3% |
| Completed high school | 83.9% | 84.7% | 83.0% |
| Completed some college | 51.0% | 61.8% | 59.4% |
| Completed associate degree | 27.8% | 40.7% | 38.5% |
| Completed bachelors | 16.2% | 32.9% | 30.3% |
| Completed masters | 5.8% | 12.7% | 11.5% |
| Completed professional degree | 1.3% | 3.4% | 3.3% |
| Completed doctorate | 0.5% | 1.2% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in Gillespie. Using the proficiency score averages, the average test scores for Gillespie, IL schools is 32%. The average student to teacher ratio is 17:1. In Gillespie, IL, an average of 84.4% of students have completed 8th grade and an average of 83.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Worden, IL | 875 | 57% | 18.8% |
| Carlinville, IL | 5,645 | 45% | 7.0% |
| Sorento, IL | 499 | 37% | 22.9% |
| Shipman, IL | 616 | 37% | 22.9% |
| Mount Olive, IL | 2,052 | 34% | 30.2% |
| Gillespie, IL | 2,977 | 32% | 32.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Woodbury Heights, NJ | 2,977 | 46% | 5.2% |
| Smithsburg, MD | 2,977 | 55% | 14.6% |
| Stanton, TX | 2,978 | 41% | 14.2% |
| Windsor, MO | 2,976 | 28% | 42.2% |
| Delphi, IN | 2,979 | 50% | 3.5% |
| Gillespie, IL | 2,977 | 32% | 32.6% |
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