| Index | South Dennis | Massachusetts | National |
| Average Test Scores | 37% | 52% | 48% |
| Student/Teacher ratio | 12:1 | 14:1 | 16:1 |
| Total public schools | 1 | 1,167 | 79,221 |
| Total private schools | n/a | 508 | 24,874 |
| Total post-secondary schools | n/a | 193 | 7,963 |
| Index | South Dennis | Massachusetts | National |
| Completed 8th grade | 92.3% | 88.3% | 84.3% |
| Completed high school | 92.0% | 87.2% | 83.0% |
| Completed some college | 62.9% | 65.0% | 59.4% |
| Completed associate degree | 38.3% | 49.0% | 38.5% |
| Completed bachelors | 29.2% | 41.2% | 30.3% |
| Completed masters | 9.3% | 18.2% | 11.5% |
| Completed professional degree | 1.8% | 5.4% | 3.3% |
| Completed doctorate | 1.2% | 2.6% | 1.3% |
There are a total of 1 public schools, n/a private schools and n/a post-secondary schools in South Dennis. Using the proficiency score averages, the average test scores for South Dennis, MA schools is 37%. The average student to teacher ratio is 12:1. In South Dennis, MA, an average of 92.3% of students have completed 8th grade and an average of 92.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| North Eastham, MA | 1,741 | 76% | 57.3% |
| Orleans, MA | 1,519 | 65% | 35.4% |
| Brewster, MA | 1,347 | 62% | 29.2% |
| East Sandwich, MA | 3,628 | 60% | 25.0% |
| Harwich Center, MA | 1,383 | 55% | 13.5% |
| South Dennis, MA | 2,895 | 37% | 22.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Milaca, MN | 2,894 | 45% | 5.5% |
| Deer Lodge, MT | 2,893 | 45% | 6.9% |
| Shenandoah, VA | 2,897 | 77% | 60.8% |
| Palo Cedro, CA | 2,893 | 56% | 16.1% |
| Northwest Harwinton, CT | 2,897 | 77% | 60.4% |
| South Dennis, MA | 2,895 | 37% | 22.9% |
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