| Index | Decatur | Georgia | National |
| Average Test Scores | 38% | 42% | 48% |
| Student/Teacher ratio | 14:1 | 16:1 | 16:1 |
| Total public schools | 48 | 2,164 | 79,221 |
| Total private schools | 24 | 515 | 24,874 |
| Total post-secondary schools | 9 | 192 | 7,963 |
| Index | Decatur | Georgia | National |
| Completed 8th grade | 94.1% | 82.3% | 84.3% |
| Completed high school | 93.8% | 81.0% | 83.0% |
| Completed some college | 85.9% | 57.8% | 59.4% |
| Completed associate degree | 75.7% | 36.8% | 38.5% |
| Completed bachelors | 72.3% | 29.4% | 30.3% |
| Completed masters | 37.7% | 11.1% | 11.5% |
| Completed professional degree | 17.1% | 3.2% | 3.3% |
| Completed doctorate | 7.4% | 1.3% | 1.3% |
There are a total of 48 public schools, 24 private schools and 9 post-secondary schools in Decatur. Using the proficiency score averages, the average test scores for Decatur, GA schools is 38%. The average student to teacher ratio is 14:1. In Decatur, GA, an average of 94.1% of students have completed 8th grade and an average of 93.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Dunwoody, GA | 49,466 | 68% | 42.4% |
| Scottdale, GA | 11,196 | 61% | 26.0% |
| Avondale Estates, GA | 3,142 | 58% | 20.1% |
| Marietta, GA | 60,687 | 58% | 19.8% |
| Berkeley Lake, GA | 2,324 | 57% | 17.7% |
| Decatur, GA | 24,814 | 38% | 20.8% |
| City | Population | Avg. Test Scores | National Avg. |
| Paris, TX | 24,814 | 50% | 3.3% |
| Hazleton, PA | 24,804 | 24% | 50.0% |
| Clinton, MS | 24,797 | 60% | 24.2% |
| Ardmore, OK | 24,834 | 32% | 33.4% |
| Rosemount, MN | 24,792 | 52% | 8.5% |
| Decatur, GA | 24,814 | 38% | 20.8% |
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