- Clarbeston Road
- Clawdd-newydd
- Clocaenog
- Clunderwen
- Clydach
- Clydach Vale
- Clydey
- Clynnog-fawr
- Clyro
- Coed-Talon
- Coedana
- Coedely
- Coedpoeth
- Coelbren
- Coity
- Colwinston
- Colwyn Bay
- Connahs Quay
- Conwy
- Caerhûn
- Capelulo
- Cerrigydrudion
- Cwm Penmachno
- Cwmpenanner
- Corris
- Corwen
- Cosheston
- Caerwedros
- Capel Dewi
- Cnwch Coch