Port Jefferson
- County:
- Suffolk County
- County Seat:
- No
- Area (mi²):
- 3.063
- State:
- New York
Port Jefferson is a village located in Suffolk County, New York. Port Jefferson has a 2026 population of 8,189. Port Jefferson is currently growing at a rate of 0.33% annually and its population has increased by 2.76% since the most recent census, which recorded a population of 7,969 in 2020.