| Index | Northwest Harwinton | Connecticut | National |
| Average Test Scores | 77% | 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 | Northwest Harwinton | Connecticut | National |
| Completed 8th grade | 90.4% | 88.0% | 84.3% |
| Completed high school | 90.4% | 86.9% | 83.0% |
| Completed some college | 63.5% | 62.9% | 59.4% |
| Completed associate degree | 43.8% | 45.5% | 38.5% |
| Completed bachelors | 36.0% | 38.0% | 30.3% |
| Completed masters | 12.3% | 16.8% | 11.5% |
| Completed professional degree | 0.5% | 4.6% | 3.3% |
| Completed doctorate | 0.5% | 1.7% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Northwest Harwinton. Using the proficiency score averages, the average test scores for Northwest Harwinton, CT schools is 77%. The average student to teacher ratio is n/a. In Northwest Harwinton, CT, an average of 90.4% of students have completed 8th grade and an average of 90.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Simsbury Center, CT | 6,271 | 79% | 63.5% |
| West Simsbury, CT | 3,131 | 77% | 60.4% |
| Weatogue, CT | 2,396 | 72% | 49.0% |
| Collinsville, CT | 3,729 | 71% | 47.9% |
| Salmon Brook, CT | 2,348 | 71% | 47.4% |
| Northwest Harwinton, CT | 2,897 | 77% | 60.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Shenandoah, VA | 2,897 | 77% | 60.8% |
| Onalaska, TX | 2,898 | 54% | 12.5% |
| Stamford, TX | 2,898 | 46% | 5.2% |
| Sale Creek, TN | 2,899 | 48% | 0.5% |
| South Dennis, MA | 2,895 | 37% | 22.9% |
| Northwest Harwinton, CT | 2,897 | 77% | 60.4% |
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