- Sacramento
- Saint Bernard
- Saint Charles
- Saint Columbans
- Saint Edward
- Saint Helena
- Saint Helena Island
- Saint James
- Saint Johns Trailer Court
- Saint Libory
- Saint Mary
- Saint Michael
- Saint Paul
- Saint Stephens
- Salem
- Saltillo
- Sanborn
- Sandridge
- Sands Trailer Park
- Santee
- Sarben
- Sargent
- Saronville
- Sartoria
- Saunders
- School Island
- Schuyler
- Scotia
- Scotia Junction
- Scottsbluff