D
- (Province of Pangasinan) Dita
- (Province of Ilocos Norte) Diriqui
- (Province of Ilocos Sur) Dirdirig
- (Province of La Union) Dirdirig
- (Province of Ilocos Norte) Dipilat
- (Province of Ilocos Sur) Dinwedee East
- (Province of La Union) Dinanum
- (Province of Ilocos Sur) Dinaloan
- (Province of Pangasinan) Dinalaoan
- (Province of Ilocos Norte) Dimamaga
- (Province of Ilocos Norte) Dilpoc
- (Province of Ilocos Sur) Dili
- (Province of La Union) Dili
- (Province of Ilocos Norte) Dilabu
- (Province of Pangasinan) Dilasup
- (Province of Ilocos Norte) Dilap
- (Province of Pangasinan) Dilan
- (Province of Pangasinan) Diket
- (Province of Ilocos Norte) Dichai
- (Province of Ilocos Norte) Der-ap
- (Province of Pangasinan) Decreto
- (Province of Ilocos Norte) Dayas
- (Province of Ilocos Sur) Dayadan
- (Province of Ilocos Sur) Dayangui
- (Province of Pangasinan) David
- (Province of Ilocos Norte) Daurao
- (Province of Ilocos Norte) Daurao
- (Province of Ilocos Sur) Dasay
- (Province of La Union) Dasay
- (Province of Ilocos Norte) Dariwdiw