C
- (Laois) Castletown
- (Uíbh Fhailí) Coolagary
- (Laois) Clonaslee
- (Uíbh Fhailí) Cloghan
- (Meath) Carlanstown
- (Westmeath) Clonmellon
- (Uíbh Fhailí) Crinkill
- (Kildare) Calverstown
- (Meath) Clonee
- (Kildare) Carragh
- (Louth) Collon
- (Wicklow) Carnew
- (Louth) Castlebellingham
- (Westmeath) Castlepollard
- (Wexford) Castletown
- (Louth) Carlingford
- (Kildare) Castledermot
- (Kilkenny) Castlecomer
- (Wicklow) Charlesland
- (Wexford) Castlebridge
- (Louth) Clogherhead
- (Kilkenny) Callan
- (Uíbh Fhailí) Clara
- (Wexford) Courtown
- (Dublin City) Cabra
- (Dublin City) Chapelizod
- (Kildare) Confey
- (Kildare) Cherryville
- (Kildare) Clane
- (Fingal County) Castleknock