| Index | Decatur | Mississippi | National |
| Average Test Scores | 57% | 40% | 48% |
| Student/Teacher ratio | 18:1 | 16:1 | 16:1 |
| Total public schools | 4 | 893 | 79,221 |
| Total private schools | 1 | 206 | 24,874 |
| Total post-secondary schools | 1 | 68 | 7,963 |
| Index | Decatur | Mississippi | National |
| Completed 8th grade | 86.5% | 78.6% | 84.3% |
| Completed high school | 85.3% | 76.7% | 83.0% |
| Completed some college | 71.7% | 52.5% | 59.4% |
| Completed associate degree | 44.7% | 29.8% | 38.5% |
| Completed bachelors | 31.6% | 21.0% | 30.3% |
| Completed masters | 18.1% | 7.9% | 11.5% |
| Completed professional degree | 3.2% | 2.2% | 3.3% |
| Completed doctorate | 2.3% | 0.9% | 1.3% |
There are a total of 4 public schools, 1 private schools and 1 post-secondary schools in Decatur. Using the proficiency score averages, the average test scores for Decatur, MS schools is 57%. The average student to teacher ratio is 18:1. In Decatur, MS, an average of 86.5% of students have completed 8th grade and an average of 85.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Union, MS | 2,581 | 58% | 20.8% |
| Sebastopol, MS | 325 | 54% | 12.5% |
| Lake, MS | 507 | 39% | 19.1% |
| Newton, MS | 3,190 | 35% | 27.4% |
| Conehatta, MS | 1,239 | 17% | 64.6% |
| Decatur, MS | 1,755 | 57% | 17.7% |
| City | Population | Avg. Test Scores | National Avg. |
| Mercer, PA | 1,755 | 59% | 23.7% |
| Wallis, TX | 1,755 | 42% | 13.5% |
| Portola, CA | 1,755 | 36% | 25.0% |
| Corvallis, MT | 1,755 | 50% | 3.6% |
| Kaibito, AZ | 1,755 | 13% | 74.0% |
| Decatur, MS | 1,755 | 57% | 17.7% |
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