| Index | Colchester | Illinois | National |
| Average Test Scores | 26% | 33% | 48% |
| Student/Teacher ratio | 19:1 | 18:1 | 16:1 |
| Total public schools | 5 | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |

| Index | Colchester | Illinois | National |
| Completed 8th grade | 86.9% | 86.2% | 84.3% |
| Completed high school | 86.0% | 84.7% | 83.0% |
| Completed some college | 46.3% | 61.8% | 59.4% |
| Completed associate degree | 20.6% | 40.7% | 38.5% |
| Completed bachelors | 12.8% | 32.9% | 30.3% |
| Completed masters | 5.5% | 12.7% | 11.5% |
| Completed professional degree | 2.1% | 3.4% | 3.3% |
| Completed doctorate | 2.1% | 1.2% | 1.3% |
There are a total of 5 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, IL schools is 26%. The average student to teacher ratio is 19:1. In Colchester, IL, an average of 86.9% of students have completed 8th grade and an average of 86.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Bowen, IL | 599 | 40% | 17.7% |
| Good Hope, IL | 419 | 35% | 27.1% |
| Macomb, IL | 18,071 | 30% | 37.0% |
| Augusta, IL | 628 | 30% | 38.5% |
| Sciota, IL | 88 | 25% | 47.9% |
| Colchester, IL | 1,383 | 26% | 46.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Des Arc, AR | 1,384 | 66% | 37.0% |
| Covelo, CA | 1,384 | 22% | 55.2% |
| Penhook, VA | 1,382 | 87% | 81.3% |
| Cannelton, IN | 1,384 | 27% | 43.8% |
| Rock Port, MO | 1,382 | 67% | 39.6% |
| Colchester, IL | 1,383 | 26% | 46.4% |