- Cefn
- Cefn-bryn-brain
- Cefn-bychan
- Cefn Mawr
- Cei Connah
- Ceinws
- Cerrigydrudion
- Ceunant
- Cheriton
- Church Village
- Cilan
- Cilfrew
- Cilgwyn
- Cilmery
- Clatter
- Clawdd Poncen
- Clemenstone
- Clwt - y - bont
- Clydach
- Clyne
- Cnwch Coch
- Coed-y-bryn
- Coed-y-paen
- Coed-y-parc
- Coed Ystumgwern
- Coedhirwaun
- Coedway
- Cold Blow
- Comins Coch
- Commins Coch