S
- (Province of Ilocos Sur) Sacpil
- (Province of Ilocos Sur) Sacang
- (Province of Ilocos Sur) Sabuanan
- (Province of Pangasinan) Sabor
- (Province of La Union) Sablot
- (Province of Ilocos Sur) Sabangan Pingan
- (Province of Ilocos Sur) Sabañgan Bato
- (Province of Ilocos Sur) Sabangan Buaya
- (Province of Ilocos Sur) Sabangan
- (Province of Pangasinan) Sabangan
- (Province of Pangasinan) Sabangan
- (Province of Pangasinan) Sabangan
- (Province of Pangasinan) Sabañgan
- (Province of Pangasinan) Sabang
- (Province of Ilocos Sur) Sabaan
- (Province of Ilocos Sur) San Clemente de Nagtablan
- (Province of La Union) Sundugan Point
- (Province of Ilocos Norte) Sal Bang
- (Province of Ilocos Norte) Santa Asuncion
- (Province of Ilocos Norte) San Guillermo
- (Province of Ilocos Norte) Santa Monica
- (Province of Ilocos Norte) Sidar
- (Province of Ilocos Norte) Sarnap
- (Province of Ilocos Norte) Saguel
- (Province of Ilocos Norte) Santa Cecilia
- (Province of Ilocos Norte) San Sutro
- (Province of Ilocos Norte) Silud
- (Province of Ilocos Norte) Sagaboan
- (Province of Ilocos Norte) Saludares
- (Province of Ilocos Norte) Santa Regina