S
- (Province of Pangasinan) San Alfonso
- (Province of Pangasinan) San Alejandro
- (Province of Ilocos Norte) San Alberto
- (Province of Ilocos Norte) San Agustin
- (Province of Ilocos Sur) San Angustin
- (Province of La Union) San Agustin
- (Province of La Union) San Agustin
- (Province of La Union) San Agustin Norte
- (Province of Pangasinan) San Agustin
- (Province of Pangasinan) Samuyao
- (Province of Ilocos Sur) Sampatingan
- (Province of Pangasinan) Samat
- (Province of Ilocos Norte) Samac
- (Province of Ilocos Sur) Salvador Segundo
- (Province of Ilocos Sur) Salvador
- (Province of Pangasinan) Salvador
- (Province of Pangasinan) Salvacion
- (Province of Pangasinan) Salvacion
- (Province of Pangasinan) Salud
- (Province of Pangasinan) Sulud
- (Province of Ilocos Norte) Salsalamagui
- (Province of Ilocos Norte) Salpad
- (Province of Pangasinan) Salomague Norte
- (Province of Ilocos Sur) Salomague Island
- (Province of Ilocos Sur) Solomague
- (Province of Ilocos Norte) Salanap
- (Province of Ilocos Sur) Sal-lacong
- (Province of Ilocos Sur) Sallacapo
- (Province of Pangasinan) Salisi
- (Province of Pangasinan) Salindo