C
- (Wexford) Coolvally
- (Laois) Coolrain
- (Westmeath) Coolnahay
- (Wexford) Coolmela
- (Wicklow) Coolkenna Street
- (Westmeath) Coole
- (Kilkenny) Coolcullen
- (Wicklow) Coolattin
- (Kilkenny) Coolatogher
- (Louth) Coolamoney
- (Kildare) Colbinstown
- (Meath) Collierstown
- (Meath) Collegeland
- (Kilkenny) Coan
- (An Longfort) Cloondara
- (An Longfort) Cloonart
- (Dublin City) Clontarf
- (Fingal County) Clonsilla
- (Uíbh Fhailí) Clonsast Lower
- (Uíbh Fhailí) Clonony
- (Uíbh Fhailí) Clonmore
- (County Carlow) Clonmore
- (Uíbh Fhailí) Clonlyon
- (Kildare) Clonkeen
- (Wexford) Clongeen
- (Uíbh Fhailí) Clongarret
- (Wexford) Clonevin Cross Roads
- (Kildare) Cloncurry
- (Laois) Cloncourse Bridge
- (Uíbh Fhailí) Clonbullogue