S
- (Province of Pangasinan) Salisay
- (Province of Ilocos Norte) Suyo
- (Province of Ilocos Norte) Suyo
- (Province of La Union) Suyo
- (Province of La Union) Suyo
- (Province of Ilocos Norte) Suto
- (Province of Ilocos Sur) Surngit
- (Province of Ilocos Norte) Surgui
- (Province of Pangasinan) Supo
- (Province of Ilocos Sur) Supit
- (Province of Ilocos Sur) Sungiam
- (Province of Ilocos Norte) Sungaden
- (Province of Ilocos Norte) Sumgar
- (Province of Pangasinan) Sumaing
- (Province of Ilocos Sur) Sumagu
- (Province of Ilocos Norte) Sumader
- (Province of Ilocos Sur) Sulvec
- (Province of Ilocos Norte) Sulbec
- (Province of Ilocos Sur) Sulbec
- (Province of Ilocos Norte) Sukit
- (Province of La Union) Suguida Sur
- (Province of Ilocos Sur) Sugpon
- (Province of La Union) Sugidan Norte
- (Province of Pangasinan) Sugcong
- (Province of Pangasinan) Sugcong
- (Province of La Union) Sudipen
- (Province of Ilocos Norte) Sacsuquen
- (Province of Ilocos Sur) Suksuquit
- (Province of La Union) Sucoc Sur
- (Province of La Union) Sucoc Norte