| ID | | City | | Name |
|---|
| 21H | | Anacortes | | Skyline Seaplane Base |
| 0W7 | | Bellingham | | Floathaven Seaplane Base |
| W33 | | Friday Harbor | | Friday Harbor Seaplane Base |
| S60 | | Kenmore | | Kenmore Air Harbor Seaplane Base |
| W37 | | Lakewood | | American Lake Seaplane Base |
| 81W | | Lopez | | Fishermans Bay Seaplane Base |
| 1WA | | Oroville | | Scott Seaplane Base |
| W66 | | Port Angeles | | Port Angeles Seaplane Base |
| 83Q | | Poulsbo | | Port of Poulsbo Marina Moorage Seaplane Base |
| W36 | | Renton | | Will Rogers Wiley Post Memorial Seaplane Base |
| W39 | | Roche Harbor | | Roche Harbor Seaplane Base |
| W49 | | Rosario | | Rosario Seaplane Base |
| W55 | | Seattle | | Kenmore Air Seaplane Base |
| 0W0 | | Seattle | | Seattle Seaplanes Seaplane Base |
