| Index | Colchester | Connecticut | National |
| Average Test Scores | 65% | 53% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 654 | 79,221 |
| Total private schools | n/a | 207 | 24,874 |
| Total post-secondary schools | n/a | 81 | 7,963 |
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| Index | Colchester | Connecticut | National |
| Completed 8th grade | 93.7% | 88.0% | 84.3% |
| Completed high school | 92.5% | 86.9% | 83.0% |
| Completed some college | 59.9% | 62.9% | 59.4% |
| Completed associate degree | 36.8% | 45.5% | 38.5% |
| Completed bachelors | 29.5% | 38.0% | 30.3% |
| Completed masters | 7.4% | 16.8% | 11.5% |
| Completed professional degree | 0.9% | 4.6% | 3.3% |
| Completed doctorate | 0.4% | 1.7% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Colchester. Using the proficiency score averages, the average test scores for Colchester, CT schools is 65%. The average student to teacher ratio is n/a. In Colchester, CT, an average of 93.7% of students have completed 8th grade and an average of 92.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Chester Center, CT | 1,731 | 77% | 60.4% |
| Higganum, CT | 1,763 | 75% | 55.2% |
| South Coventry, CT | 1,413 | 73% | 51.4% |
| Mansfield Center, CT | 1,367 | 71% | 47.4% |
| Deep River Center, CT | 2,638 | 70% | 44.8% |
| Colchester, CT | 5,147 | 65% | 35.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Johnstown, OH | 5,149 | 69% | 44.3% |
| Sterling, AK | 5,150 | 37% | 22.9% |
| Philomath, OR | 5,143 | 52% | 9.1% |
| Granite Shoals, TX | 5,142 | 30% | 37.5% |
| Birdsboro, PA | 5,141 | 73% | 51.0% |
| Colchester, CT | 5,147 | 65% | 35.4% |
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