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 | 3,157 |
| Dayton | Columbia County | 2,476 |
| Duluth | Clark County | 2,116 |
| Davenport | Lincoln County | 1,828 |
| Darrington | Snohomish County | 1,505 |
| Dallesport | Klickitat County | 1,470 |
| Dash Point | King County | 992 |
| Deming | Whatcom County | 631 |
| Dollars Corner | Clark County | 588 |
| Deep River | Pacific County | 196 |
| Donald | Yakima County | 147 |
| Dixie | Walla Walla County | 120 |
| Disautel | Okanogan County | 53 |
| Danville | Ferry County | 45 |