- Stanhope
- Steinmetz
- Sterling
- Snow Hollow Lake
- Selsa
- Sni Mills
- South Lee
- Schuermann Heights
- Sherman
- Stevens
- Sand Hill
- Salcedo
- Sandywoods Township
- Sargent
- Sylvania Township
- Sabula
- Saint Albans
- Saint Patrick
- Santa Fe
- Saverton
- Shirley
- Shook
- Shoveltown
- Siloam Springs
- Silva
- Silver Lake
- Simmons
- Sleeper
- Solo
- South Fork