| Index | Decatur | Alabama | National |
| Average Test Scores | n/a | n/a | 48% |
| Student/Teacher ratio | 14:1 | 15:1 | 16:1 |
| Total public schools | 21 | 1,307 | 79,221 |
| Total private schools | 4 | 353 | 24,874 |
| Total post-secondary schools | 1 | 102 | 7,963 |
| Index | Decatur | Alabama | National |
| Completed 8th grade | 78.6% | 80.7% | 84.3% |
| Completed high school | 77.7% | 79.2% | 83.0% |
| Completed some college | 56.8% | 53.8% | 59.4% |
| Completed associate degree | 34.0% | 31.9% | 38.5% |
| Completed bachelors | 25.2% | 24.0% | 30.3% |
| Completed masters | 7.5% | 8.9% | 11.5% |
| Completed professional degree | 1.6% | 2.5% | 3.3% |
| Completed doctorate | 0.3% | 1.0% | 1.3% |
There are a total of 21 public schools, 4 private schools and 1 post-secondary schools in Decatur. Using the proficiency score averages, the average test scores for Decatur, AL schools is n/a. The average student to teacher ratio is 14:1. In Decatur, AL, an average of 78.6% of students have completed 8th grade and an average of 77.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Decatur, AL | 55,419 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Hempstead, NY | 55,454 | 35% | 27.5% |
| Anderson, IN | 55,342 | 28% | 41.2% |
| Weymouth Town, MA | 55,601 | 52% | 8.0% |
| Pflugerville, TX | 55,712 | 53% | 10.8% |
| Kettering, OH | 55,720 | 80% | 65.3% |
| Decatur, AL | 55,419 | n/a |
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