C
- (Province of Ilocos Norte) Cali
- (Province of Ilocos Norte) Caldaraan
- (Province of Pangasinan) Calbueg
- (Province of Ilocos Norte) Calayab
- (Province of Ilocos Sur) Calay-Ab
- (Province of Pangasinan) Calay
- (Province of La Union) Calaotit
- (Province of Ilocos Sur) Calaotit
- (Province of Pangasinan) Calaocan
- (Province of Ilocos Sur) Calawaan
- (Province of Ilocos Sur) Calaoaan
- (Province of Pangasinan) Calanutan
- (Province of Ilocos Norte) Calambeg
- (Province of La Union) Calabugao
- (Province of Pangasinan) Calobaoan
- (Province of Pangasinan) Cais
- (Province of Pangasinan) Caingal
- (Province of Pangasinan) Cagubay
- (Province of Pangasinan) Caging
- (Province of La Union) Caggao
- (Province of Ilocos Sur) Cagayungan
- (Province of Pangasinan) Cagayasen
- (Province of Ilocos Sur) Caei-Layan
- (Province of Ilocos Norte) Cadenglaan
- (Province of Ilocos Norte) Cadaratan
- (Province of La Union) Cadapli
- (Province of Ilocos Sur) Cadanglaan
- (Province of Pangasinan) Cadamortisan
- (Province of Ilocos Norte) Cadalman
- (Province of Ilocos Norte) Cadagasan