A
- (Province of Isabela) Andabuen
- (Province of Cagayan) Alabug West
- (Province of Cagayan) Angang
- (Province of Cagayan) Anurturu
- (Province of Cagayan) Aquib Norte
- (Province of Quirino) Algad
- (Province of Quirino) Asaklat
- (Province of Quirino) Alicia
- (Province of Isabela) Anonang
- (Province of Isabela) Aringay
- (Province of Isabela) Aromin
- (Province of Isabela) Atelan
- (Province of Isabela) Aurora
- (Province of Isabela) Apanay
- (Province of Isabela) Alugug
- (Province of Isabela) Antagan Uno
- (Province of Isabela) Annafunan
- (Province of Isabela) Arcon
- (Province of Isabela) Alinguigan III
- (Province of Isabela) Anao
- (Province of Isabela) Aurora
- (Province of Isabela) Aneg
- (Province of Cagayan) Agaman
- (Province of Cagayan) Alba
- (Province of Cagayan) Atanangiunit
- (Province of Cagayan) Abucay
- (Province of Cagayan) Asilang
- (Province of Cagayan) Aba
- (Province of Cagayan) Afusing Sur
- (Province of Cagayan) Afusing Norte