- Saint Catherines
- Saint’s Island
- Saint Thomas Island
- Sand Island
- Scalpnagown
- Scanlan’s Island
- Scarriff
- Scattery Island
- Scool
- Scott’s Bridge
- Shanavogh
- Shanganagh
- Shannakea
- Shannon
- Shanvally
- Shanweela
- Sheeaun
- Sheshia
- Shore Island
- Sixmilebridge
- Skaghard
- Slievemore
- Slievenlooney
- Sod Island
- Sorrel Island Bridge
- Spancelhill
- Spanish Point
- Spectacle Bridge
- Sruhaunakit Bridge
- Stranagalloon