| Index | Greenwich | Ohio | National |
| Average Test Scores | 66% | 61% | 48% |
| Student/Teacher ratio | 16:1 | 17:1 | 16:1 |
| Total public schools | 2 | 3,650 | 79,221 |
| Total private schools | n/a | 1,000 | 24,874 |
| Total post-secondary schools | n/a | 393 | 7,963 |
| Index | Greenwich | Ohio | National |
| Completed 8th grade | 79.5% | 86.9% | 84.3% |
| Completed high school | 78.4% | 85.6% | 83.0% |
| Completed some college | 29.0% | 55.7% | 59.4% |
| Completed associate degree | 14.3% | 35.1% | 38.5% |
| Completed bachelors | 9.4% | 26.7% | 30.3% |
| Completed masters | 4.2% | 10.0% | 11.5% |
| Completed professional degree | 0.6% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of 2 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, OH schools is 66%. The average student to teacher ratio is 16:1. In Greenwich, OH, an average of 79.5% of students have completed 8th grade and an average of 78.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Shelby, OH | 8,282 | 70% | 45.6% |
| Norwalk, OH | 16,860 | 67% | 39.6% |
| New London, OH | 2,476 | 65% | 34.4% |
| Plymouth, OH | 1,607 | 64% | 33.0% |
| Ashland, OH | 20,304 | 63% | 31.3% |
| Greenwich, OH | 1,489 | 66% | 36.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Thompson Falls, MT | 1,489 | 41% | 13.9% |
| Ness City, KS | 1,489 | 16% | 66.7% |
| Herscher, IL | 1,489 | 30% | 38.0% |
| Montezuma, IA | 1,490 | 80% | 66.0% |
| Bement, IL | 1,490 | 39% | 18.8% |
| Greenwich, OH | 1,489 | 66% | 36.5% |
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