Friday Harbor
- County:
- San Juan County
- County Seat:
- Yes
- Area (mi²):
- 2.187
- State:
- Washington
Friday Harbor is a town located in San Juan County, Washington. Friday Harbor has a 2026 population of 2,744. It is also the county seat of San Juan County. Friday Harbor is currently growing at a rate of 0.11% annually and its population has increased by 4.29% since the most recent census, which recorded a population of 2,631 in 2020.