| Index | Greenwich | Connecticut | National |
| Average Test Scores | 67% | 53% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 654 | 79,221 |
| Total private schools | n/a | 207 | 24,874 |
| Total post-secondary schools | n/a | 81 | 7,963 |
| Index | Greenwich | Connecticut | National |
| Completed 8th grade | 91.9% | 88.0% | 84.3% |
| Completed high school | 91.2% | 86.9% | 83.0% |
| Completed some college | 72.8% | 62.9% | 59.4% |
| Completed associate degree | 63.5% | 45.5% | 38.5% |
| Completed bachelors | 58.7% | 38.0% | 30.3% |
| Completed masters | 29.7% | 16.8% | 11.5% |
| Completed professional degree | 8.5% | 4.6% | 3.3% |
| Completed doctorate | 1.9% | 1.7% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Greenwich. Using the proficiency score averages, the average test scores for Greenwich, CT schools is 67%. The average student to teacher ratio is n/a. In Greenwich, CT, an average of 91.9% of students have completed 8th grade and an average of 91.2% 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% |
| Bronxville, NY | 6,450 | 88% | 82.3% |
| Scarsdale, NY | 17,890 | 87% | 81.8% |
| Alpine, NJ | 1,459 | 87% | 81.3% |
| Greenwich, CT | 12,967 | 67% | 40.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Lynnfield, MA | 12,968 | 77% | 60.4% |
| Claremont, NH | 12,969 | 38% | 20.2% |
| El Dorado, KS | 12,976 | 33% | 32.1% |
| Los Alamos, NM | 12,978 | 53% | 9.4% |
| Oakland, NJ | 12,953 | 68% | 42.5% |
| Greenwich, CT | 12,967 | 67% | 40.2% |
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