C
- (County Cork) Coolea
- (County Tipperary) Coolbaun
- (County Cork) Connonagh
- (Clare) Connolly
- (Clare) Coney Island
- (Kerry) Collorus
- (Kerry) Coars
- (County Tipperary) Coalbrook
- (Kerry) Clynacartan
- (Clare) Cloonusker
- (Limerick City and County Council) Cloonteen
- (Clare) Clonlara
- (Clare) Clooncoorha
- (County Waterford) Clooncogaile
- (County Cork) Cloonbannin
- (County Tipperary) Clonoulty
- (County Cork) Clonmult
- (County Tipperary) Clonmore
- (County Tipperary) Cloneen
- (County Waterford) Clonea
- (Limerick City and County Council) Cloncagh
- (County Tipperary) Clonakenny
- (Kerry) Clogher
- (County Cork) Cloghdonnell
- (Clare) Cloghaun
- (Clare) Cloghanulk
- (Kerry) Cloghane
- (County Cork) Cloghane
- (County Cork) Cliffort
- (County Cork) Clear Island