| 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. |
| West Sayville, NY | 4,956 | 82% | 69.8% |
| Shoreham, NY | 375 | 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% |
Here are the best places to live in New York
See the best places to live in Port Jefferson
These are the largest cities in New York
Check out the 10 safest cities in New York