- Sparta
- Sunset
- Stahlbusch Island
- Shadowood
- Shady Dell
- South Lake Oswego
- Springwater
- Stafford
- Sunset
- Sea Lion Rock
- Seal Island
- Snag Islands
- Submarine Rock
- Sunset Beach
- Surf Pines
- Svensen
- Svensen Island
- Svensen Junction
- Sand Island (historical)
- Sandy Island
- South Scappoose
- Spitzenberg
- Saddle Rock
- Seal Rock
- Sisters
- Sisters Rocks
- Southeast Black Rock
- Square Rock
- Square White Rock
- Steamboat Rock