| Index | Crystal Lake | Connecticut | National |
| Average Test Scores | 60% | 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 |
| Index | Crystal Lake | Connecticut | National |
| Completed 8th grade | 91.9% | 88.0% | 84.3% |
| Completed high school | 91.9% | 86.9% | 83.0% |
| Completed some college | 65.9% | 62.9% | 59.4% |
| Completed associate degree | 42.5% | 45.5% | 38.5% |
| Completed bachelors | 38.5% | 38.0% | 30.3% |
| Completed masters | 12.8% | 16.8% | 11.5% |
| Completed professional degree | 2.8% | 4.6% | 3.3% |
| Completed doctorate | 0.8% | 1.7% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Crystal Lake. Using the proficiency score averages, the average test scores for Crystal Lake, CT schools is 60%. The average student to teacher ratio is n/a. In Crystal Lake, CT, an average of 91.9% of students have completed 8th grade and an average of 91.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Storrs, CT | 16,392 | 77% | 60.4% |
| South Coventry, CT | 1,413 | 73% | 51.4% |
| Mansfield Center, CT | 1,367 | 71% | 47.4% |
| Longmeadow, MA | 15,736 | 70% | 46.7% |
| Wilbraham, MA | 3,251 | 63% | 30.2% |
| Crystal Lake, CT | 2,567 | 60% | 24.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Mattawan, MI | 2,567 | 64% | 32.3% |
| Shelby, MI | 2,567 | 33% | 31.9% |
| Maynardville, TN | 2,567 | 30% | 37.2% |
| Henniker, NH | 2,566 | 53% | 9.4% |
| Graniteville, SC | 2,566 | 42% | 13.2% |
| Crystal Lake, CT | 2,567 | 60% | 24.0% |
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