| Index | Derby | Connecticut | National |
| Average Test Scores | 37% | 53% | 48% |
| Student/Teacher ratio | 15:1 | 14:1 | 16:1 |
| Total public schools | 4 | 654 | 79,221 |
| Total private schools | 1 | 207 | 24,874 |
| Total post-secondary schools | n/a | 81 | 7,963 |
| Index | Derby | Connecticut | National |
| Completed 8th grade | 85.8% | 88.0% | 84.3% |
| Completed high school | 83.8% | 86.9% | 83.0% |
| Completed some college | 53.3% | 62.9% | 59.4% |
| Completed associate degree | 34.7% | 45.5% | 38.5% |
| Completed bachelors | 25.7% | 38.0% | 30.3% |
| Completed masters | 8.3% | 16.8% | 11.5% |
| Completed professional degree | 1.8% | 4.6% | 3.3% |
| Completed doctorate | 0.4% | 1.7% | 1.3% |
There are a total of 4 public schools, 1 private schools and n/a post-secondary schools in Derby. Using the proficiency score averages, the average test scores for Derby, CT schools is 37%. The average student to teacher ratio is 15:1. In Derby, CT, an average of 85.8% of students have completed 8th grade and an average of 83.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Westport, CT | 27,511 | 84% | 75.7% |
| Trumbull, CT | 36,477 | 79% | 64.0% |
| Cheshire Village, CT | 6,491 | 78% | 62.0% |
| Southport, CT | 1,710 | 77% | 60.4% |
| Orange, CT | 13,928 | 75% | 55.7% |
| Derby, CT | 12,420 | 37% | 24.0% |
| City | Population | Avg. Test Scores | National Avg. |
| North St. Paul, MN | 12,421 | 44% | 7.9% |
| West Monroe, LA | 12,431 | 77% | 60.5% |
| Markham, IL | 12,401 | 16% | 66.3% |
| Irmo, SC | 12,397 | 59% | 22.6% |
| Wilmington, OH | 12,444 | 56% | 16.1% |
| Derby, CT | 12,420 | 37% | 24.0% |
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