- Saint John
- Shelton
- South Bend
- Springdale
- Salmon Creek
- Sammamish
- Satsop
- Satus
- SeaTac
- Seattle
- Sedro-Woolley
- Selah
- Sequim
- Shaker Church
- Shoreline
- Silvana
- Silverdale
- Skokomish
- Skykomish
- Smokey Point
- Snohomish
- Snoqualmie
- Snoqualmie Pass
- Soap Lake
- South Cle Elum
- South Hill
- South Prairie
- Spanaway
- Spangle
- Spokane