| Index | Clarendon Hills | Illinois | National |
| Average Test Scores | 77% | 33% | 48% |
| Student/Teacher ratio | 18:1 | 18:1 | 16:1 |
| Total public schools | 4 | 3,938 | 79,221 |
| Total private schools | 2 | 1,438 | 24,874 |
| Total post-secondary schools | 1 | 306 | 7,963 |
| Index | Clarendon Hills | Illinois | National |
| Completed 8th grade | 97.8% | 86.2% | 84.3% |
| Completed high school | 97.7% | 84.7% | 83.0% |
| Completed some college | 92.6% | 61.8% | 59.4% |
| Completed associate degree | 82.0% | 40.7% | 38.5% |
| Completed bachelors | 77.8% | 32.9% | 30.3% |
| Completed masters | 33.6% | 12.7% | 11.5% |
| Completed professional degree | 9.9% | 3.4% | 3.3% |
| Completed doctorate | 2.3% | 1.2% | 1.3% |
There are a total of 4 public schools, 2 private schools and 1 post-secondary schools in Clarendon Hills. Using the proficiency score averages, the average test scores for Clarendon Hills, IL schools is 77%. The average student to teacher ratio is 18:1. In Clarendon Hills, IL, an average of 97.8% of students have completed 8th grade and an average of 97.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Oak Brook, IL | 8,377 | 79% | 64.6% |
| Hinsdale, IL | 17,817 | 74% | 54.7% |
| Western Springs, IL | 13,775 | 74% | 54.4% |
| River Forest, IL | 11,215 | 67% | 38.5% |
| Riverside, IL | 9,044 | 65% | 35.2% |
| Clarendon Hills, IL | 9,104 | 77% | 59.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Mahomet, IL | 9,102 | 52% | 7.6% |
| Riverside, CT | 9,108 | 86% | 78.6% |
| Whitestown, IN | 9,109 | 75% | 56.3% |
| Savoy, IL | 9,110 | 55% | 14.6% |
| Covington, TN | 9,113 | 28% | 40.8% |
| Clarendon Hills, IL | 9,104 | 77% | 59.4% |
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