| Index | Colchester | Connecticut | National |
| Average Test Scores | 56% | 47% | 49% |
| 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 |
| 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 56%. 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, State | Population | Avg. Test Scores | National Avg. |
| Chester Center, CT | 1,986 | 77% | 56% |
| Mansfield Center, CT | 969 | 76% | 54% |
| Portland, CT | 5,607 | 66% | 34% |
| Higganum, CT | 1,745 | 65% | 31% |
| Glastonbury Center, CT | 7,523 | 64% | 31% |
| Colchester, CT | 4,475 | 56% | 13% |
| City, State | Population | Avg. Test Scores | National Avg. |
| Clintonville, WI | 4,475 | 36% | 28% |
| Oak View, CA | 4,472 | 42% | 15% |
| Elko New Market, MN | 4,472 | 83% | 68% |
| Tuscola, IL | 4,478 | 31% | 36% |
| Soldotna, AK | 4,471 | 38% | 23% |
| Colchester, CT | 4,475 | 56% | 13% |
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