| Index | Crystal Lake | Illinois | National |
| Average Test Scores | 46% | 33% | 48% |
| Student/Teacher ratio | 18:1 | 18:1 | 16:1 |
| Total public schools | 18 | 3,938 | 79,221 |
| Total private schools | 7 | 1,438 | 24,874 |
| Total post-secondary schools | 3 | 306 | 7,963 |
| Index | Crystal Lake | Illinois | National |
| Completed 8th grade | 91.8% | 86.2% | 84.3% |
| Completed high school | 90.3% | 84.7% | 83.0% |
| Completed some college | 71.2% | 61.8% | 59.4% |
| Completed associate degree | 48.1% | 40.7% | 38.5% |
| Completed bachelors | 40.4% | 32.9% | 30.3% |
| Completed masters | 13.5% | 12.7% | 11.5% |
| Completed professional degree | 2.6% | 3.4% | 3.3% |
| Completed doctorate | 1.0% | 1.2% | 1.3% |
There are a total of 18 public schools, 7 private schools and 3 post-secondary schools in Crystal Lake. Using the proficiency score averages, the average test scores for Crystal Lake, IL schools is 46%. The average student to teacher ratio is 18:1. In Crystal Lake, IL, an average of 91.8% of students have completed 8th grade and an average of 90.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| South Barrington, IL | 4,963 | 69% | 42.7% |
| North Barrington, IL | 2,789 | 64% | 33.3% |
| Barrington, IL | 10,442 | 61% | 26.2% |
| Schaumburg, IL | 73,392 | 56% | 17.6% |
| Lake Zurich, IL | 19,912 | 55% | 15.4% |
| Crystal Lake, IL | 39,685 | 46% | 3.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Marlborough, MA | 39,663 | 50% | 4.0% |
| Indian Trail, NC | 39,644 | 55% | 14.1% |
| Romeoville, IL | 39,644 | 36% | 24.1% |
| Royal Palm Beach, FL | 39,615 | 66% | 37.4% |
| Sumter, SC | 39,758 | 32% | 34.1% |
| Crystal Lake, IL | 39,685 | 46% | 3.9% |
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