S
- (Laois) Swan
- (Kilkenny) Summerhill
- (Westmeath) Street
- (Westmeath) Streamstown
- (Kilkenny) Stoneyford
- (Wicklow) Stonybatter
- (Dún Laoghaire-Rathdown) Stillorgan
- (Dún Laoghaire-Rathdown) Stepaside
- (Louth) Stabannan
- (Uíbh Fhailí) Srah
- (Laois) Springfield
- (Laois) Spink
- (Westmeath) Southhill
- (Kilkenny) Slieverue
- (Laois) Sleatygraigue
- (Wexford) Slade
- (Wexford) Screen
- (Fingal County) Skerries Islands
- (Meath) Siddan
- (Kildare) Sheriffhill
- (Wicklow) Sheeanamore
- (Uíbh Fhailí) Shannon Harbour
- (Louth) Shanlis Cross Roads
- (County Carlow) Seskinryan
- (County Carlow) Seskinrea
- (Fingal County) Sea Mount
- (Wicklow) Scalp
- (Wicklow) Saundersville
- (Dublin City) Santry
- (Louth) Sandymount