| City | County | 2026 Pop. ↓ |
|---|---|---|
| Federal Way | King County | 99,315 |
| Frederickson | Pierce County | 25,488 |
| Five Corners | Clark County | 22,202 |
| Fairwood | King County | 18,284 |
| Ferndale | Whatcom County | 17,944 |
| Fort Lewis | Pierce County | 14,661 |
| Felida | Clark County | 11,459 |
| Fife | King County | 11,059 |
| Fairwood | Spokane County | 11,024 |
| Fircrest | Pierce County | 6,911 |
| Finley | Benton County | 5,670 |
| Forks | Clallam County | 3,504 |
| Fox Island | Pierce County | 3,303 |
| Fairchild AFB | Spokane County | 3,071 |
| Friday Harbor | San Juan County | 2,752 |
| Fobes Hill | Snohomish County | 2,744 |
| Fern Prairie | Clark County | 2,189 |
| Freeland | Island County | 1,948 |
| Fords Prairie | Lewis County | 1,717 |
| Fall City | King County | 1,685 |
| Fife Heights | King County | 1,363 |
| Fairfield | Spokane County | 591 |
| Four Lakes | Spokane County | 484 |
| Farmington | Whitman County | 133 |