- Sabula
- Sac City
- Sageville
- Saint Ansgar
- Saint Anthony
- Saint Benedict
- Saint Charles
- Saint Donatus
- Saint Joseph
- Saint Lucas
- Saint Marys
- Saint Olaf
- Saint Paul
- Saint Sebald
- Salem
- Salina
- Salix
- Samoa
- San Souci Island
- Sanborn
- Sand Bar Beach Resort and Trailer Court
- Sand Springs
- Sandusky
- Sandusky Mobile Home Villa
- Sandyville
- Santiago
- Saratoga
- Sattre
- Saude
- Savannah