C
- Cilgwm
- Caerhûn
- (Sir Powys) Church Stoke
- (County of Flintshire) Cilcain
- Crosskeys
- (Rhondda Cynon Taf) Coedely
- (Sir Powys) Colva
- (Sir Powys) Cregrina
- (Sir Powys) Cathedine
- Cray
- (Sir Powys) Cascob
- (Gwynedd) Caerdeon
- Cae'r-geiliog
- (Newport) Christchurch
- (Monmouthshire) Cwmcarvan
- (Torfaen County Borough) Cwmavon
- (Monmouthshire) Cwmyoy
- (Carmarthenshire) Carmel
- (Carmarthenshire) Cynheidre
- (Carmarthenshire) Crwbin
- (Carmarthenshire) Capel Isaac
- (Carmarthenshire) Capel Gwyn
- (Carmarthenshire) Cilycwm
- (Carmarthenshire) Capel Dewi
- (Carmarthenshire) Court Henry
- (Carmarthenshire) Croesyceilog
- (Carmarthenshire) Cwmfelin Mynach
- (Carmarthenshire) Capel Iwan
- (Carmarthenshire) Cwmorgan
- (Pembrokeshire) Crosswell