7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Oak Harbor | 1 | 23,610 | 24,625 | -0.85% | 2,446 | 9.65 | City |
| Camano | 2 | 22,053 | 17,073 | 7.15% | 555 | 39.76 | CDP |
| Whidbey Island Station | 3 | 2,717 | 2,375 | 2.96% | 414 | 6.57 | CDP |
| Coupeville | 4 | 1,917 | 1,944 | -0.26% | 1,509 | 1.27 | Town |
| Freeland | 5 | 1,856 | 1,883 | -0.7% | 478 | 3.88 | CDP |
| Clinton | 6 | 1,224 | 1,123 | 1.66% | 1,209 | 1.01 | CDP |
| Langley | 7 | 1,143 | 1,150 | -0.09% | 1,134 | 1.01 | City |
Oak Harbor is the largest city in Island County, with a population of 23,610.
Langley is the smallest city in Island County.
There are 7 cities in Island County, Washington.