- Silverton
- Silvies
- Simnasho
- Siskiyou
- Sisters
- Sisters
- Sisters
- Sisters Rocks
- Sitkum
- Six Corners
- Sixes
- Snag Island
- Snag Islands
- Sodaville
- Somerset West
- South Junction
- South Lake Oswego
- South Lebanon
- South Scappoose
- South Beach
- Southeast Black Rock
- Sow and Pigs
- Sparta
- Speaker
- Spitzenberg
- Spoos Mill
- Sprague River
- Spray
- Springbrook
- Springdale