C
- (Province of Cagayan) Casitan
- (Province of Cagayan) Casitan
- (Province of Cagayan) Casingsingan Norte
- (Province of Cagayan) Casili
- (Province of Isabela) Casili
- (Province of Nueva Vizcaya) Casijaguen
- (Province of Cagayan) Casicallan Norte
- (Province of Cagayan) Casicallan
- (Province of Cagayan) Casicallan Sur
- (Province of Isabela) Casibarag
- (Province of Nueva Vizcaya) Casibaoengan
- (Province of Nueva Vizcaya) Casat
- (Province of Cagayan) Casagan
- (Province of Cagayan) Carupian
- (Province of Isabela) Carulay
- (Province of Isabela) Carpentero
- (Province of Isabela) Carmencita
- (Province of Cagayan) Carilucud
- (Province of Isabela) Caraniogan
- (Province of Cagayan) Carallangan
- (Province of Isabela) Carabatan Punta
- (Province of Isabela) Carabbatan Nuevo
- (Province of Isabela) Carabatan Grande
- (Province of Isabela) Carabatan Chica
- (Province of Isabela) Carabatan Bacareno
- (Province of Isabela) Carabatan
- (Province of Isabela) Cansan
- (Province of Cagayan) Cappuian
- (Province of Isabela) Capuseran
- (Province of Isabela) Capo