| 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 |


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| 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 | 908 | 57% | 18.8% |
| Carlinville, IL | 5,804 | 45% | 7.0% |
| Sorento, IL | 515 | 37% | 22.9% |
| Shipman, IL | 638 | 37% | 22.9% |
| Mount Olive, IL | 2,094 | 34% | 30.2% |
| Gillespie, IL | 3,043 | 32% | 32.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Cumberland Center, ME | 3,044 | 72% | 49.7% |
| Watkinsville, GA | 3,042 | 70% | 46.1% |
| Iuka, MS | 3,044 | 54% | 12.2% |
| Smithsburg, MD | 3,042 | 55% | 14.6% |
| Valley View, PA | 3,044 | 54% | 12.5% |
| Gillespie, IL | 3,043 | 32% | 32.6% |