C
- (Province of Cagayan) Concong
- (Province of Cagayan) Concepcion
- (Province of Isabela) Concepcion
- (Province of Nueva Vizcaya) Comon
- (Province of Nueva Vizcaya) Comandag
- (Province of Cagayan) Comablam
- (Province of Cagayan) Colonia
- (Province of Cagayan) Colonia Number Two
- (Province of Nueva Vizcaya) Chumalpos
- (Province of Batanes) Chavayan
- (Province of Cagayan) Centromargo
- (Province of Cagayan) Centro
- (Province of Isabela) Centro
- (Province of Cagayan) Cent Island
- (Province of Nueva Vizcaya) Cayton
- (Province of Isabela) Cawacan
- (Province of Isabela) Catungauan
- (Province of Cagayan) Catuguran
- (Province of Cagayan) Catugan
- (Province of Cagayan) Cattaran
- (Province of Cagayan) Cattanamman
- (Province of Cagayan) Catotoran
- (Province of Cagayan) Cataratan
- (Province of Cagayan) Cataraoan
- (Province of Isabela) Cataguing
- (Province of Cagayan) Cataggaman Viejo
- (Province of Cagayan) Cataggaman Nuevo
- (Province of Isabela) Catabayungan
- (Province of Nueva Vizcaya) Cataan
- (Province of Cagayan) Cassap