Oak Harbor
- County:
- Island County
- County Seat:
- No
- Area (mi²):
- 9.651
- State:
- Washington
Oak Harbor is a city located in Island County, Washington. Oak Harbor has a 2026 population of 24,163. Oak Harbor is currently growing at a rate of 0.36% annually but its population has decreased by -1.89% since the most recent census, which recorded a population of 24,628 in 2020.