| Index | Gilliam | 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 | Gilliam | Louisiana | National |
| Completed 8th grade | 87.7% | 80.2% | 84.3% |
| Completed high school | 87.7% | 78.5% | 83.0% |
| Completed some college | 60.5% | 49.9% | 59.4% |
| Completed associate degree | 38.3% | 28.6% | 38.5% |
| Completed bachelors | 37.0% | 23.0% | 30.3% |
| Completed masters | 7.4% | 7.9% | 11.5% |
| Completed professional degree | 1.2% | 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 Gilliam. Using the proficiency score averages, the average test scores for Gilliam, LA schools is n/a. The average student to teacher ratio is n/a. In Gilliam, LA, an average of 87.7% of students have completed 8th grade and an average of 87.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Belcher, LA | 296 | 94% | 95.8% |
| Benton, LA | 2,124 | 88% | 83.6% |
| Plain Dealing, LA | 1,003 | 65% | 34.4% |
| Vivian, LA | 3,531 | 60% | 25.0% |
| Mooringsport, LA | 522 | 60% | 24.0% |
| Gilliam, LA | 109 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Eagle, AK | 109 | 50% | 4.2% |
| New Middletown, IN | 109 | 65% | 34.4% |
| Thorp, WA | 109 | 60% | 24.0% |
| Vilas, CO | 109 | 50% | 4.2% |
| Roosevelt, WA | 108 | 50% | 4.2% |
| Gilliam, LA | 109 | n/a |
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