C
- (Clare) Carrigaholt
- (County Cork) Carrigadrohid
- (County Tipperary) Carrig
- (County Cork) Carrig
- (County Cork) Carrig
- (County Tipperary) Carrickbeg
- (County Cork) Carbery Island
- (Kerry) Caragh Bridge
- (County Cork) Cappeen
- (County Cork) Cappanoloha
- (Kerry) Cappamore
- (County Tipperary) Cappagh White
- (Clare) Cappagh
- (County Tipperary) Cappagh
- (Limerick City and County Council) Cappagh
- (County Cork) Capel Island
- (Clare) Canon Island
- (Kerry) Camp
- (County Waterford) Callaghane Bridge
- (County Cork) Calf Island West
- (County Cork) Calf Islands
- (County Cork) Calf Island Middle
- (County Cork) Calf Island East
- (Limerick City and County Council) Cahir Guillamore
- (County Cork) Cahermore
- (Clare) Cahermacun
- (County Cork) Caherkeen
- (Kerry) Caherdaniel
- (County Cork) Caherbarnagh
- (Kerry) Caheracruttera