| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Saddleview Mobile Home Park | city | Washington | United States | 47.40 | -120.31 | 830 | |
| Sagemoor | city | Washington | United States | 46.40 | -119.06 | 830 | |
| Saginaw | city | Washington | United States | 46.97 | -123.39 | 180 | |
| Sahalee | city | Washington | United States | 47.63 | -122.06 | 400 | |
| Saint Andrews | city | Washington | United States | 47.70 | -119.43 | 2509 | |
| Saint Clair | city | Washington | United States | 47.02 | -122.72 | 3 | |
| Saint Cloud | city | Washington | United States | 45.60 | -122.11 | 200 | |
| Saint Helens | city | Washington | United States | 46.34 | -122.53 | 974 | |
| Saint Hubert (historical) | city | Washington | United States | 47.60 | -119.75 | 2509 | |
| Saint John | city | Washington | United States | 45.70 | -122.61 | 200 | |
| Saint John | city | Washington | United States | 47.09 | -117.58 | 1998 | |
| Saint Martins Hot Springs | city | Washington | United States | 45.73 | -121.80 | 203 | |
| Saint Urban | city | Washington | United States | 46.52 | -122.89 | 830 | |
| Salishan | city | Washington | United States | 47.22 | -122.41 | 246 | |
| Salkum | city | Washington | United States | 46.53 | -122.63 | 830 | |
| Salmon Creek | city | Washington | United States | 45.71 | -122.65 | 200 | |
| Samish | city | Washington | United States | 48.61 | -122.44 | 111 | |
| Samish Island | city | Washington | United States | 48.58 | -122.54 | 0 | |
| Sammamish | city | Washington | United States | 47.64 | -122.08 | 200 | |
| Sampson | city | Washington | United States | 47.04 | -124.17 | 6 | |
| Sams Trailer Park | city | Washington | United States | 48.25 | -124.26 | 200 | |
| San Souci Mobile Estates | city | Washington | United States | 47.14 | -122.28 | 830 | |
| San de Fuca | city | Washington | United States | 48.24 | -122.72 | 0 | |
| Sand - Lo Trailer Park | city | Washington | United States | 46.37 | -124.05 | 22 | |
| Sand Point | city | Washington | United States | 47.68 | -122.25 | 3 | |
| Sands 55 Plus Mobile Park | city | Washington | United States | 48.10 | -122.18 | 49 | |
| Sandy Acres Mobile Home Park | city | Washington | United States | 47.15 | -122.11 | 830 | |
| Sandy Bend | city | Washington | United States | 46.24 | -122.91 | 200 | |
| Sapolil | city | Washington | United States | 46.12 | -118.24 | 1669 | |
| Sappho | city | Washington | United States | 48.07 | -124.28 | 830 | |
| Sara | city | Washington | United States | 45.75 | -122.71 | 196 | |
| Saratoga | city | Washington | United States | 48.07 | -122.47 | 3 | |
| Saratoga Shores | city | Washington | United States | 48.14 | -122.51 | 0 | |
| Sarvis Mobile Estates | city | Washington | United States | 47.76 | -122.24 | 157 | |
| Satsop | city | Washington | United States | 47.00 | -123.48 | 72 | |
| Satus | city | Washington | United States | 46.27 | -120.15 | 830 | |
| Sauk | city | Washington | United States | 48.47 | -121.63 | 262 | |
| Sawyer | city | Washington | United States | 46.46 | -120.36 | 931 | |
| Saxby | city | Washington | United States | 47.49 | -117.05 | 2654 | |
| Saxon | city | Washington | United States | 48.69 | -122.19 | 298 |