18 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Des Moines | King County | 33,286 |
| DuPont | Pierce County | 9,750 |
| Duvall | King County | 9,458 |
| Deer Park | Spokane County | 5,386 |
| Desert Aire | Grant County | 2,986 |
| Dayton | Columbia County | 2,476 |
| Davenport | Lincoln County | 1,828 |
| Duluth | Clark County | 1,770 |
| Darrington | Snohomish County | 1,505 |
| Dallesport | Klickitat County | 1,482 |
| Dollars Corner | Clark County | 1,030 |
| Dash Point | King County | 921 |
| Deming | Whatcom County | 446 |
| Donald | Yakima County | 158 |
| Deep River | Pacific County | 148 |
| Dixie | Walla Walla County | 146 |
| Danville | Ferry County | 102 |
| Disautel | Okanogan County | 22 |