
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 2025 population of 23,610. Oak Harbor is currently declining at a rate of -0.85% annually and its population has decreased by -4.12% since the most recent census, which recorded a population of 24,625 in 2020.
The average household income in Oak Harbor is $94,620 with a poverty rate of 8.33%. The median age in Oak Harbor is 31.8 years: 31.4 years for males, and 32.4 years for females.