C
- (Province of Ilocos Sur) Codoog
- (Province of Ilocos Sur) Catuodaan
- (Province of Pangasinan) Caoayan-Kiling
- (Province of Pangasinan) Caloocan Dupo
- (Province of Ilocos Sur) Cuta
- (Province of La Union) Cupang
- (Province of Pangasinan) Colibra Island
- (Province of Pangasinan) Culebra
- (Province of Ilocos Norte) Culao
- (Province of La Union) Cuenca
- (Province of Ilocos Sur) Cucubbuot
- (Province of Ilocos Norte) Cubol
- (Province of Ilocos Sur) Cubcubbuat
- (Province of Pangasinan) Cuardanetaan
- (Province of Pangasinan) Cruz
- (Province of Pangasinan) Crisanto Lichauco
- (Province of Ilocos Sur) Cawag
- (Province of Ilocos Sur) Cosocos
- (Province of Pangasinan) Casinoro
- (Province of Ilocos Sur) Coscosnong
- (Province of Ilocos Norte) Corocor
- (Province of Pangasinan) Curareng
- (Province of Pangasinan) Corangot
- (Province of Ilocos Norte) Coran
- (Province of Ilocos Sur) Coral Island
- (Province of La Union) Consuegro
- (Province of La Union) Consolacion
- (Province of Pangasinan) Consiempre
- (Province of Pangasinan) Concordia
- (Province of Ilocos Sur) Conconig