| Index | Darien | Illinois | National |
| Average Test Scores | 48% | 33% | 48% |
| Student/Teacher ratio | 15:1 | 18:1 | 16:1 |
| Total public schools | 8 | 3,938 | 79,221 |
| Total private schools | 3 | 1,438 | 24,874 |
| Total post-secondary schools | 1 | 306 | 7,963 |
| Index | Darien | Illinois | National |
| Completed 8th grade | 94.8% | 86.2% | 84.3% |
| Completed high school | 94.4% | 84.7% | 83.0% |
| Completed some college | 77.3% | 61.8% | 59.4% |
| Completed associate degree | 56.8% | 40.7% | 38.5% |
| Completed bachelors | 48.6% | 32.9% | 30.3% |
| Completed masters | 18.7% | 12.7% | 11.5% |
| Completed professional degree | 4.8% | 3.4% | 3.3% |
| Completed doctorate | 1.9% | 1.2% | 1.3% |
There are a total of 8 public schools, 3 private schools and 1 post-secondary schools in Darien. Using the proficiency score averages, the average test scores for Darien, IL schools is 48%. The average student to teacher ratio is 15:1. In Darien, IL, an average of 94.8% of students have completed 8th grade and an average of 94.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Oak Brook, IL | 8,085 | 79% | 64.6% |
| Clarendon Hills, IL | 8,834 | 77% | 59.4% |
| Hinsdale, IL | 17,366 | 74% | 54.7% |
| Western Springs, IL | 13,247 | 74% | 54.4% |
| River Forest, IL | 10,883 | 67% | 38.5% |
| Darien, IL | 21,843 | 48% | 0.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Geneva, IL | 21,843 | 49% | 1.6% |
| Shelbyville, TN | 21,841 | 25% | 47.8% |
| Rose Hill, VA | 21,846 | 85% | 76.0% |
| Lexington, SC | 21,847 | 63% | 30.9% |
| Sunny Isles Beach, FL | 21,853 | 79% | 63.5% |
| Darien, IL | 21,843 | 48% | 0.2% |
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