| Index | Decatur | Georgia | National |
| Average Test Scores | 38% | 35% | 49% |
| Student/Teacher ratio | 14:1 | 16:1 | 16:1 |
| Total public schools | 48 | 2,176 | 79,235 |
| Total private schools | 24 | 515 | 24,875 |
| Total post-secondary schools | 9 | 194 | 7,965 |
| Index | Decatur | Georgia | National |
| Completed 8th grade | 95.2% | 81.6% | 83.8% |
| Completed high school | 94.6% | 80.1% | 82.4% |
| Completed some college | 85.9% | 56.5% | 58.4% |
| Completed associate degree | 74.4% | 35.4% | 37.2% |
| Completed bachelors | 71.2% | 28.3% | 29.3% |
| Completed masters | 36.9% | 10.4% | 11.0% |
| Completed professional degree | 16.1% | 3.1% | 3.2% |
| Completed doctorate | 7.2% | 1.2% | 1.3% |
| City, State | Population | Avg. Test Scores | National Avg. |
| Dunwoody, GA | 47,182 | 60% | 23% |
| Avondale Estates, GA | 2,777 | 53% | 8% |
| Marietta, GA | 58,436 | 53% | 7% |
| Mountain Park CDP, GA | 12,510 | 49% | 1% |
| Berkeley Lake, GA | 1,739 | 46% | 7% |
| Decatur, GA | 19,888 | 38% | 22% |
| City, State | Population | Avg. Test Scores | National Avg. |
| East Massapequa, NY | 19,891 | 58% | 17% |
| Windsor, CO | 19,865 | 43% | 12% |
| Cartersville, GA | 19,858 | 38% | 22% |
| King of Prussia, PA | 19,919 | 62% | 25% |
| Dickinson, ND | 19,920 | 43% | 14% |
| Decatur, GA | 19,888 | 38% | 22% |