| 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 | 

				
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				| 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% |