Iowa cities starting with S
- Sac City, IA 7
- Sanborn, IA 8
- Scarville, IA 6
- Sheffield, IA 5
- Sheldon, IA 11
- Shellsburg, IA 5
- Shenandoah, IA 20
- Sherrill, IA 5
- Sibley, IA 9
- Sidney, IA 6
- Sigourney, IA 6
- Sioux Center, IA 17
- Sioux City, IA 101
- Sioux Rapids, IA 7
- Spencer, IA 20
- Spirit Lake, IA 10
- Springville, IA 5
- State Center, IA 6
- Storm Lake, IA 16
- Story City, IA 5
- Strawberry Point, IA 6
- Stuart, IA 6
- Sumner, IA 10