| Index | McHenry | Illinois | National |
| Average Test Scores | 35% | 33% | 48% |
| Student/Teacher ratio | 19:1 | 18:1 | 16:1 |
| Total public schools | 10 | 3,938 | 79,221 |
| Total private schools | 5 | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | McHenry | Illinois | National |
| Completed 8th grade | 88.3% | 86.2% | 84.3% |
| Completed high school | 87.3% | 84.7% | 83.0% |
| Completed some college | 59.4% | 61.8% | 59.4% |
| Completed associate degree | 33.6% | 40.7% | 38.5% |
| Completed bachelors | 25.0% | 32.9% | 30.3% |
| Completed masters | 8.0% | 12.7% | 11.5% |
| Completed professional degree | 0.9% | 3.4% | 3.3% |
| Completed doctorate | 0.3% | 1.2% | 1.3% |
There are a total of 10 public schools, 5 private schools and n/a post-secondary schools in McHenry. Using the proficiency score averages, the average test scores for McHenry, IL schools is 35%. The average student to teacher ratio is 19:1. In McHenry, IL, an average of 88.3% of students have completed 8th grade and an average of 87.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Long Grove, IL | 7,907 | 70% | 46.5% |
| North Barrington, IL | 2,789 | 64% | 33.3% |
| Silver Lake, WI | 2,506 | 62% | 28.1% |
| Barrington, IL | 10,442 | 61% | 26.2% |
| Lake Zurich, IL | 19,912 | 55% | 15.4% |
| McHenry, IL | 26,889 | 35% | 26.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Lindenhurst, NY | 26,885 | 62% | 28.1% |
| Temple Terrace, FL | 26,901 | 43% | 11.0% |
| Carrollton, GA | 26,857 | 48% | 0.3% |
| Shoreview, MN | 26,922 | 60% | 24.8% |
| Eureka, CA | 26,938 | 39% | 18.8% |
| McHenry, IL | 26,889 | 35% | 26.1% |
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