- Stanwood
- Stanzel
- Starlite Mobile Home Park
- State Center
- State Center Junction
- Steamboat Rock
- Stennett
- Sterling
- Steuben
- Stevens
- Stiles
- Stillwell
- Stilson
- Stockport
- Stockton
- Stone City
- Stonega
- Storm Lake
- Story City
- Stout
- Stover Heights Community
- Strahan
- Strand
- Stratford
- Strawberry Point
- Streepy
- Stringtown
- Struble
- Stuart
- Sully