| Index | Cary | Illinois | National |
| Average Test Scores | 43% | 33% | 48% |
| Student/Teacher ratio | 17:1 | 18:1 | 16:1 |
| Total public schools | 8 | 3,938 | 79,221 |
| Total private schools | 1 | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Cary | Illinois | National |
| Completed 8th grade | 93.1% | 86.2% | 84.3% |
| Completed high school | 92.6% | 84.7% | 83.0% |
| Completed some college | 77.9% | 61.8% | 59.4% |
| Completed associate degree | 54.0% | 40.7% | 38.5% |
| Completed bachelors | 45.1% | 32.9% | 30.3% |
| Completed masters | 13.9% | 12.7% | 11.5% |
| Completed professional degree | 2.9% | 3.4% | 3.3% |
| Completed doctorate | 0.7% | 1.2% | 1.3% |
There are a total of 8 public schools, 1 private schools and n/a post-secondary schools in Cary. Using the proficiency score averages, the average test scores for Cary, IL schools is 43%. The average student to teacher ratio is 17:1. In Cary, IL, an average of 93.1% of students have completed 8th grade and an average of 92.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Libertyville, IL | 20,300 | 71% | 48.7% |
| Long Grove, IL | 7,907 | 70% | 46.5% |
| South Barrington, IL | 4,963 | 69% | 42.7% |
| North Barrington, IL | 2,789 | 64% | 33.3% |
| Buffalo Grove, IL | 40,804 | 64% | 32.4% |
| Cary, IL | 17,926 | 43% | 9.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Arroyo Grande, CA | 17,924 | 49% | 1.9% |
| Beltsville, MD | 17,922 | 25% | 47.6% |
| Sheridan, WY | 17,938 | 64% | 33.1% |
| Lenoir, NC | 17,909 | 36% | 25.9% |
| Palestine, TX | 17,906 | 48% | 0.9% |
| Cary, IL | 17,926 | 43% | 9.6% |
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