C
- (County Tipperary) Cullahill
- (Kerry) Crossmount
- (Clare) Cross
- (County Waterford) Cross
- (County Cork) Crookhaven
- (Limerick City and County Council) Creggaun
- (Clare) Cregg
- (County Tipperary) Cregg
- (County Cork) Cregg
- (Limerick City and County Council) Creeves
- (Clare) Creegh
- (County Cork) Creagh
- (County Cork) Creagh
- (Clare) Crab Island
- (County Cork) Cousane
- (Limerick City and County Council) Courtmatrix
- (Kerry) Coumduff
- (County Cork) Coulagh
- (County Waterford) Corgarve
- (Kerry) Cordal
- (County Waterford) Corbally
- (Kerry) Coosavuddig
- (Clare) Cooraclare
- (Limerick City and County Council) Coonagh
- (Kerry) Coomnahincha
- (Clare) Coolmeen
- (Kerry) Coollick
- (County Cork) Coole West
- (County Tipperary) Cooleeny
- (County Cork) Coole East