18 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Des Moines | King County | 33,366 |
| Duvall | King County | 9,741 |
| DuPont | Pierce County | 9,677 |
| Deer Park | Spokane County | 5,582 |
| Desert Aire | Grant County | 3,259 |
| Dayton | Columbia County | 2,482 |
| Duluth | Clark County | 2,154 |
| Davenport | Lincoln County | 1,851 |
| Darrington | Snohomish County | 1,511 |
| Dallesport | Klickitat County | 1,488 |
| Dash Point | King County | 996 |
| Deming | Whatcom County | 650 |
| Dollars Corner | Clark County | 628 |
| Deep River | Pacific County | 195 |
| Donald | Yakima County | 156 |
| Dixie | Walla Walla County | 115 |
| Disautel | Okanogan County | 57 |
| Danville | Ferry County | 48 |