27 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Auburn | King County | 84,747 |
| Arlington | Snohomish County | 22,916 |
| Anacortes | Skagit County | 18,380 |
| Aberdeen | Grays Harbor County | 17,047 |
| Artondale | Pierce County | 14,374 |
| Airway Heights | Spokane County | 12,528 |
| Alderwood Manor | Snohomish County | 10,566 |
| Ahtanum | Yakima County | 3,563 |
| Algona | King County | 3,260 |
| Arlington Heights | Snohomish County | 3,153 |
| Alderton | Pierce County | 2,849 |
| Allyn | Mason County | 2,816 |
| Amboy | Clark County | 1,530 |
| Anderson Island | Pierce County | 1,411 |
| Asotin | Asotin County | 1,199 |
| Ames Lake | King County | 1,058 |
| Alger | Skagit County | 713 |
| Ashford | Pierce County | 651 |
| Albion | Whitman County | 547 |
| Aberdeen Gardens | Grays Harbor County | 435 |
| Almira | Lincoln County | 331 |
| Acme | Whatcom County | 293 |
| Addy | Stevens County | 88 |
| Altoona | Wahkiakum County | 57 |
| Alder | Pierce County | 42 |
| Amanda Park | Grays Harbor County | 38 |
| Anatone | Asotin County | 12 |