| Index | Darien | Connecticut | National |
| Average Test Scores | 85% | 53% | 48% |
| Student/Teacher ratio | 13:1 | 14:1 | 16:1 |
| Total public schools | 8 | 654 | 79,221 |
| Total private schools | 1 | 207 | 24,874 |
| Total post-secondary schools | n/a | 81 | 7,963 |
| Index | Darien | Connecticut | National |
| Completed 8th grade | 97.4% | 88.0% | 84.3% |
| Completed high school | 97.3% | 86.9% | 83.0% |
| Completed some college | 89.3% | 62.9% | 59.4% |
| Completed associate degree | 82.6% | 45.5% | 38.5% |
| Completed bachelors | 79.5% | 38.0% | 30.3% |
| Completed masters | 34.5% | 16.8% | 11.5% |
| Completed professional degree | 7.8% | 4.6% | 3.3% |
| Completed doctorate | 1.5% | 1.7% | 1.3% |
There are a total of 8 public schools, 1 private schools and n/a post-secondary schools in Darien. Using the proficiency score averages, the average test scores for Darien, CT schools is 85%. The average student to teacher ratio is 13:1. In Darien, CT, an average of 97.4% of students have completed 8th grade and an average of 97.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Sea Cliff, NY | 5,045 | 92% | 91.7% |
| Glen Head, NY | 4,843 | 89% | 85.7% |
| Cold Spring Harbor, NY | 2,864 | 87% | 81.3% |
| Old Greenwich, CT | 6,980 | 87% | 80.2% |
| Chappaqua, NY | 2,628 | 86% | 79.0% |
| Darien, CT | 21,519 | 85% | 76.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Anniston, AL | 21,518 | 39% | 18.4% |
| Klamath Falls, OR | 21,509 | 41% | 15.6% |
| Massapequa, NY | 21,531 | 75% | 56.1% |
| Biddeford, ME | 21,502 | 37% | 22.4% |
| Kapolei, HI | 21,541 | 49% | 2.4% |
| Darien, CT | 21,519 | 85% | 76.9% |
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