S
- (Sligo) Seevness
- (Sligo) Spurtown
- (Sligo) Spurtown Lower
- (Sligo) Spotfield
- (Sligo) Slievaward
- (Sligo) Sniggeen
- (Sligo) Seafield
- (Sligo) Shannon Eighter
- (Sligo) Shannon Oughter
- (Sligo) Slieveroe
- (Sligo) Shancough
- (Sligo) Sheeanmore
- (Sligo) Scardan
- (Sligo) Sooey
- (Sligo) Slishwood Island East
- (Sligo) Slishwood Island West
- (Sligo) Sheerevagh
- (County Leitrim) Sramore
- (County Leitrim) Sradoon
- (County Leitrim) Sliaganagh
- (County Leitrim) Sracummer
- (Sligo) Shancough
- (County Leitrim) Shancarrick
- (County Leitrim) Steveen
- (County Leitrim) Sheskin
- (County Leitrim) Socks
- (County Leitrim) Sweetwood
- (County Galway) Streamstown
- (Mayo County) Straide
- (County Galway) Stradbally