A
- (Province of Cagayan) Ammubuan
- (Province of Isabela) Amistad
- (Province of Nueva Vizcaya) Amilong
- (Province of Isabela) Ambito
- (Province of Isabela) Ambito
- (Province of Nueva Vizcaya) Ambangan
- (Province of Nueva Vizcaya) Amballo
- (Province of Isabela) Ambalatungan
- (Province of Nueva Vizcaya) Ambaguio
- (Province of Isabela) Ambabu
- (Province of Quirino) Alupipey
- (Province of Nueva Vizcaya) Alupat
- (Province of Quirino) Aluntayan
- (Province of Isabela) Almacen
- (Province of Nueva Vizcaya) Alloy
- (Province of Nueva Vizcaya) Allauan
- (Province of Nueva Vizcaya) Allavan
- (Province of Cagayan) Allasitan
- (Province of Cagayan) Allappangan
- (Province of Nueva Vizcaya) Aliuagon
- (Province of Cagayan) Alitongtong
- (Province of Cagayan) Alinunu
- (Province of Isabela) Allinguigan First
- (Province of Cagayan) Alimoan
- (Province of Cagayan) Alimanao
- (Province of Cagayan) Alilinu
- (Province of Quirino) Alicad
- (Province of Cagayan) Alibago
- (Province of Isabela) Alibadabad
- (Province of Nueva Vizcaya) Alfonso Castañeda