Washington cities starting with S
- Sammamish, WA 14
- Seatac, WA 6
- SeaTac, WA 5
- Seattle, WA 509
- Seaview, WA 5
- Sedro Woolley, WA 10
- Sedro-Woolley, WA 10
- Selah, WA 9
- Sequim, WA 25
- Shelton, WA 24
- Shoreline, WA 49
- Silverdale, WA 14
- Snohomish, WA 33
- Snoqualmie, WA 10
- Spanaway, WA 11
- Spokane, WA 231
- Spokane Valley, WA 63
- Stanwood, WA 12
- Stevenson, WA 8
- Sultan, WA 9
- Sumner, WA 13
- Sunnyside, WA 22