- Connolly
- Coolbaun
- Coolcoosaun
- Coollisteige
- Coolmeen
- Coolnacreehaun Bridge
- Coologory
- Cooraclare
- Coosheen
- Corbally
- Corlea Bridge
- Corofin
- Corraige
- Corrakyle
- Crab Island
- Craggagh
- Craghera
- Craghwee
- Cragroe
- Crane Island
- Cratloe
- Creegh
- Cregg
- Cribby Islands
- Croagh
- Croony Bridge
- Cross
- Crow’s Bridge
- Crusheen
- Cullane