26 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Auburn | King County | 81,754 |
| Arlington | Snohomish County | 21,982 |
| Anacortes | Skagit County | 18,231 |
| Aberdeen | Grays Harbor County | 17,004 |
| Artondale | Pierce County | 14,164 |
| Airway Heights | Spokane County | 11,093 |
| Alderwood Manor | Snohomish County | 11,046 |
| Arlington Heights | Snohomish County | 3,332 |
| Ahtanum | Yakima County | 3,291 |
| Algona | King County | 3,128 |
| Alderton | Pierce County | 2,634 |
| Allyn | Mason County | 2,321 |
| Anderson Island | Pierce County | 1,767 |
| Amboy | Clark County | 1,698 |
| Asotin | Asotin County | 1,196 |
| Ames Lake | King County | 1,014 |
| Ashford | Pierce County | 789 |
| Albion | Whitman County | 564 |
| Alger | Skagit County | 354 |
| Almira | Lincoln County | 338 |
| Aberdeen Gardens | Grays Harbor County | 272 |
| Alder | Pierce County | 98 |
| Acme | Whatcom County | 80 |
| Altoona | Wahkiakum County | 66 |
| Amanda Park | Grays Harbor County | 26 |
| Anatone | Asotin County | 11 |