| Index | Gilliam | Missouri | National |
| Average Test Scores | 30% | 44% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 1,899 | 79,221 |
| Total private schools | n/a | 531 | 24,874 |
| Total post-secondary schools | n/a | 213 | 7,963 |
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| Index | Gilliam | Missouri | National |
| Completed 8th grade | 88.7% | 86.0% | 84.3% |
| Completed high school | 88.7% | 84.2% | 83.0% |
| Completed some college | 37.1% | 57.7% | 59.4% |
| Completed associate degree | 16.9% | 35.2% | 38.5% |
| Completed bachelors | 12.1% | 27.6% | 30.3% |
| Completed masters | 0.8% | 10.4% | 11.5% |
| Completed professional degree | 0.0% | 2.8% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 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, MO schools is 30%. The average student to teacher ratio is n/a. In Gilliam, MO, an average of 88.7% of students have completed 8th grade and an average of 88.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Brunswick, MO | 994 | 45% | 6.8% |
| Miami, MO | 105 | 40% | 16.7% |
| Salisbury, MO | 1,631 | 37% | 22.9% |
| Marshall, MO | 13,323 | 35% | 28.1% |
| Keytesville, MO | 337 | 30% | 37.5% |
| Gilliam, MO | 193 | 30% | 37.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Golden, MS | 193 | 52% | 8.3% |
| Milroy, MN | 193 | 50% | 4.2% |
| Adak, AK | 193 | 50% | 4.2% |
| Gildford, MT | 193 | 50% | 4.2% |
| Moore, MT | 192 | 38% | 21.9% |
| Gilliam, MO | 193 | 30% | 37.5% |
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