- Cae'r-geiliog
- Caerdeon
- Caerdydd
- Caergwrle
- Caerhûn
- Caerleon
- Caernarfon
- Caerphilly
- Caersws
- Caerwent
- Caerwys
- Caldicot
- Capel Bangor
- Capel-Bettws Lleucu
- Capel Curig
- Capel-Cynon
- Capel Dewi
- Capel Garmon
- Capel Gwyn
- Capel Hendre
- Capel Isaac
- Capel Iwan
- Capel Seion
- Capel-y-ffin
- Cardigan
- Carew
- Carew Newton
- Carmarthen
- Carnguwch
- Carnhedryn