C
- (Province of Isabela) Cabeseria Catorce y Dieciséis
- (Province of Isabela) Carikkikan Norte
- (Province of Cagayan) Cabanbanan Norte
- (Province of Cagayan) Capissayan Norte
- (Province of Isabela) Cañogan Abajo Sur
- (Province of Isabela) Cañogan Alto
- (Province of Cagayan) Caritan Sur
- (Province of Cagayan) Culong
- (Province of Isabela) Cullalabo del Norte
- (Province of Isabela) Cabaritan
- (Province of Isabela) Caloocan
- (Province of Isabela) Capitol
- (Province of Isabela) Colunguan
- (Province of Cagayan) Cabagaoan
- (Province of Cagayan) Culong
- (Province of Isabela) Cutog Pequeño
- (Province of Isabela) Caniguing
- (Province of Isabela) Calamagui North
- (Province of Isabela) Cullalabo San Antonio
- (Province of Isabela) Calinaoan Centro
- (Province of Isabela) Calanigan Sur
- (Province of Isabela) Calanigan Norte
- (Province of Cagayan) Cambong
- (Province of Cagayan) Cagoran
- (Province of Cagayan) Casicallan Centro
- (Province of Cagayan) Centro Norte
- (Province of Cagayan) Centro Sur
- (Province of Cagayan) Callao Norte
- (Province of Cagayan) Cunig
- (Province of Cagayan) Cabatacan East