C
- (Mayo County) Corragooly
- (Mayo County) Cragagh
- (Mayo County) Cashellahenny
- (Mayo County) Clooncarna
- (Sligo) Cloonsillagh
- (Sligo) Calteraun
- (Sligo) Clooneen
- (Sligo) Cloonaraher
- (Sligo) Clooncunny
- (Sligo) Carrownagappul
- (Sligo) Cloonagh
- (Sligo) Curraghboy
- (Sligo) Curryfule
- (Sligo) Carns
- (Sligo) Carns Hill
- (Sligo) Coolrecuill
- (Sligo) Cashel South
- (Sligo) Cuilmore
- (Sligo) Cloonmeen
- (Sligo) Carrowntemple
- (Sligo) Cloonena
- (Sligo) Cloonanure
- (Sligo) Cloontycarn
- (Sligo) Cuilprughlish
- (Sligo) Chacefield
- (Sligo) Cloonshanbally
- (Sligo) Clogher
- (Sligo) Coagh
- (Sligo) Crow Island
- (Sligo) Corradoo