- Six Corners
- Sixes
- Snag Island
- Snag Islands
- Somerset West
- South Junction
- South Lake Oswego
- South Scappoose
- South Beach
- Southeast Black Rock
- Sow and Pigs
- Sparta
- Speaker
- Spitzenberg
- Spoos Mill
- Sprague River
- Springbrook
- Springdale
- Springwater
- Square Rock
- Square White Rock
- Stafford
- Stahlbusch Island
- Stapleton
- Starkey
- Starvation Heights
- Stayton Island
- Steamboat
- Steamboat
- Steamboat Island