| Index | Port Jefferson | New York | National |
| Average Test Scores | 77% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 4 | 4,060 | 79,221 |
| Total private schools | 2 | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Port Jefferson | New York | National |
| Completed 8th grade | 98.0% | 83.5% | 84.3% |
| Completed high school | 97.7% | 82.1% | 83.0% |
| Completed some college | 82.6% | 59.5% | 59.4% |
| Completed associate degree | 69.6% | 43.4% | 38.5% |
| Completed bachelors | 62.8% | 34.7% | 30.3% |
| Completed masters | 43.9% | 15.1% | 11.5% |
| Completed professional degree | 18.7% | 4.2% | 3.3% |
| Completed doctorate | 10.0% | 1.5% | 1.3% |
There are a total of 4 public schools, 2 private schools and n/a post-secondary schools in Port Jefferson. Using the proficiency score averages, the average test scores for Port Jefferson, NY schools is 77%. The average student to teacher ratio is n/a. In Port Jefferson, NY, an average of 98.0% of students have completed 8th grade and an average of 97.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Shoreham, NY | 375 | 82% | 69.8% |
| West Sayville, NY | 4,956 | 82% | 69.8% |
| Hauppauge, NY | 19,661 | 80% | 66.3% |
| Setauket-East Setauket, NY | 14,174 | 80% | 65.6% |
| Elwood, NY | 11,582 | 79% | 63.5% |
| Port Jefferson, NY | 8,016 | 77% | 60.8% |
| City | Population | Avg. Test Scores | National Avg. |
| Franklin, VA | 8,015 | 72% | 50.0% |
| Downingtown, PA | 8,012 | 79% | 63.9% |
| Jefferson, WI | 8,011 | 39% | 19.5% |
| New Prague, MN | 8,022 | 65% | 35.0% |
| Whitmore Lake, MI | 8,010 | 50% | 3.1% |
| Port Jefferson, NY | 8,016 | 77% | 60.8% |
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