C
- (Meath) Curragha
- (An Longfort) Culray
- (Meath) Culmullin Cross Roads
- (Wexford) Cullentra
- (Laois) Cullahill
- (Kilkenny) Crutt
- (Kilkenny) Crosspatrick
- (Wicklow) Crosspatrick
- (Meath) Cross Keys
- (Kildare) Crosskeys
- (Meath) Cross Guns
- (An Longfort) Crossea
- (Wexford) Crossabeg
- (Westmeath) Crookedwood
- (Uíbh Fhailí) Croghan
- (Wexford) Croghan
- (Laois) Crockaun
- (Laois) Crissard
- (Uíbh Fhailí) Creevagh
- (Wicklow) Creerin
- (Kilkenny) Cranroe
- (Westmeath) Craddanstown
- (Wexford) Craanford
- (Meath) Cortown
- (An Longfort) Cornacullew
- (An Longfort) Corlea
- (Louth) Corcreeghagh
- (Kildare) Corbally Cross Roads
- (Westmeath) Coralstown
- (Westmeath) Copperalley