C
- (Province of Isabela) Capuseran
- (Province of Isabela) Calaocan
- (Province of Quirino) Cofcaville
- (Province of Quirino) Cabarvan
- (Province of Isabela) Colorado
- (Province of Isabela) Calaoagan
- (Province of Isabela) Cabay
- (Province of Isabela) Caniging
- (Province of Isabela) Caralet
- (Province of Quirino) Cajel
- (Province of Quirino) Capitol
- (Province of Isabela) Casibarag Norte
- (Province of Isabela) Casibarag Sur
- (Province of Isabela) Cauan
- (Province of Isabela) Centro Dalena
- (Province of Isabela) Camasi Norte
- (Province of Isabela) Camasi Sur
- (Province of Isabela) Cumabao
- (Province of Isabela) Caligayan
- (Province of Isabela) Compra
- (Province of Isabela) Compania
- (Province of Isabela) Concepcion
- (Province of Isabela) Cabal
- (Province of Isabela) Carikkikan Sur
- (Province of Isabela) Capellan
- (Province of Isabela) Cabasingan
- (Province of Isabela) Captain Domingo Calanto
- (Province of Isabela) Calinaoan Norte
- (Province of Isabela) Calamagui
- (Province of Isabela) Caloocan Capitol