I
- (Province of Pangasinan) Ingalagala
- (Province of Pangasinan) Inerangan
- (Province of Ilocos Sur) Indadangan
- (Province of Ilocos Sur) Inandiket
- (Province of Pangasinan) Inamotan
- (Province of Ilocos Sur) Imayos Norte
- (Province of Pangasinan) Imbalbalatong
- (Province of Pangasinan) Ilog Malino
- (Province of La Union) Ilocanos Sur
- (Province of La Union) Ilocanos Norte
- (Province of La Union) Ilocano
- (Province of Ilocos Sur) Ida
- (Province of Pangasinan) Ican
- (Province of Pangasinan) Ilioilio
- (Province of Pangasinan) Isla
- (Province of La Union) Inabaan Sur
- (Province of Pangasinan) Infanta