| 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 | 

 
				
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				| 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% |