C
- (Province of Pangasinan) Caturay Sur
- (Province of Ilocos Norte) Cotur
- (Province of Ilocos Norte) Catuguing
- (Province of La Union) Catdungan
- (Province of Ilocos Sur) Catcateng
- (Province of La Union) Catbangen
- (Province of Ilocos Sur) Catayagan
- (Province of Pangasinan) Catarataraan
- (Province of Ilocos Norte) Catanglaran
- (Province of La Union) Cataguintingan Sur
- (Province of Ilocos Norte) Catagtaguen
- (Province of La Union) Castro
- (Province of Ilocos Norte) Casili
- (Province of Ilocos Norte) Casili
- (Province of Ilocos Norte) Casili
- (Province of Ilocos Sur) Casilagan
- (Province of Ilocos Sur) Casilagan
- (Province of Ilocos Sur) Casilagan Norte
- (Province of Ilocos Sur) Casilagan
- (Province of La Union) Casilagan
- (Province of La Union) Casilagan
- (Province of La Union) Casilagan
- (Province of La Union) Casilagan
- (Province of Pangasinan) Casilagan
- (Province of Pangasinan) Casilagan
- (Province of Ilocos Sur) Casiber
- (Province of La Union) Casiaman
- (Province of Ilocos Sur) Caset
- (Province of Pangasinan) Casboran
- (Province of Ilocos Sur) Casay