I
- (Province of Pangasinan) Intablado
- (Province of Ilocos Sur) Ibay
- (Province of Ilocos Norte) Iamdagan
- (Province of Ilocos Sur) Iteb
- (Province of Ilocos Norte) Ianayan
- (Province of Ilocos Norte) Igid
- (Province of Pangasinan) Inoman
- (Province of Pangasinan) Inmalog
- (Province of Pangasinan) Inmalog
- (Province of Pangasinan) Ibabasat
- (Province of Pangasinan) Imbo
- (Province of Pangasinan) Isuron
- (Province of La Union) Imelda
- (Province of La Union) Ipet
- (Province of Ilocos Sur) Imus
- (Province of La Union) Inabaan Norte
- (Province of Pangasinan) Inan Suana
- (Province of Pangasinan) Ilang
- (Province of Ilocos Sur) Imayos Sur
- (Province of Pangasinan) Inanlorenzana
- (Province of Pangasinan) Inerangan
- (Province of Pangasinan) Idong
- (Province of Ilocos Norte) Icas
- (Province of Pangasinan) Iton
- (Province of Ilocos Norte) Isiisioc
- (Province of Pangasinan) Inoman
- (Province of Pangasinan) Inmanduyan
- (Province of Pangasinan) Inmalog
- (Province of Pangasinan) Inlambo
- (Province of Pangasinan) Inirangan