C
- (Province of Pangasinan) Concepcion-Rosario
- (Province of La Union) Concepcion
- (Province of Pangasinan) Concepcion
- (Province of Ilocos Norte) Comcomloong
- (Province of Pangasinan) Comas Island
- (Province of Pangasinan) Coloon
- (Province of Ilocos Norte) Culo
- (Province of Ilocos Sur) Coliong
- (Province of Pangasinan) Coliling
- (Province of Pangasinan) Coliling
- (Province of Ilocos Sur) Culili
- (Province of Pangasinan) Colayo
- (Province of Pangasinan) Colascouayan
- (Province of La Union) Cogunan
- (Province of Pangasinan) Cocoyot
- (Province of Pangasinan) Cobol
- (Province of Ilocos Sur) Cerna
- (Province of La Union) Centro
- (Province of Ilocos Sur) Cayus
- (Province of Pangasinan) Cayucay
- (Province of Ilocos Norte) Cayubog
- (Province of Pangasinan) Cayerson
- (Province of Pangasinan) Cayañga
- (Province of Pangasinan) Cayambanan
- (Province of Pangasinan) Cawayan Bogtong
- (Province of Ilocos Norte) Cavit
- (Province of Pangasinan) Caviernesan
- (Province of Pangasinan) Cauringan
- (Province of Ilocos Norte) Caunayan
- (Province of Pangasinan) Caturay