| Index | Gillis | Louisiana | National |
| Average Test Scores | n/a | 66% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 1,334 | 79,221 |
| Total private schools | n/a | 395 | 24,874 |
| Total post-secondary schools | n/a | 175 | 7,963 |
| Index | Gillis | Louisiana | National |
| Completed 8th grade | 52.7% | 80.2% | 84.3% |
| Completed high school | 52.7% | 78.5% | 83.0% |
| Completed some college | 17.3% | 49.9% | 59.4% |
| Completed associate degree | 0.0% | 28.6% | 38.5% |
| Completed bachelors | 0.0% | 23.0% | 30.3% |
| Completed masters | 0.0% | 7.9% | 11.5% |
| Completed professional degree | 0.0% | 2.6% | 3.3% |
| Completed doctorate | 0.0% | 1.0% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Gillis. Using the proficiency score averages, the average test scores for Gillis, LA schools is n/a. The average student to teacher ratio is n/a. In Gillis, LA, an average of 52.7% of students have completed 8th grade and an average of 52.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Westlake, LA | 4,788 | 83% | 72.6% |
| Sulphur, LA | 20,122 | 81% | 68.2% |
| Reeves, LA | 171 | 77% | 60.4% |
| Iowa, LA | 3,209 | 75% | 55.7% |
| DeQuincy, LA | 3,087 | 69% | 44.1% |
| Gillis, LA | 587 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Hill City, SD | 587 | 62% | 29.5% |
| Georgetown, ID | 587 | 60% | 25.0% |
| Cherry Valley, NY | 586 | 47% | 2.1% |
| Irvington, IL | 588 | 35% | 27.1% |
| Garfield, WA | 586 | 68% | 40.6% |
| Gillis, LA | 587 | n/a |
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