- Sac City (Population: 2,368)
- Sanborn (Population: 1,353)
- Saylorville (Population: 3,238)
- Sergeant Bluff (Population: 3,321)
- Sheldon (Population: 4,914)
- Shell Rock (Population: 1,298)
- Shenandoah (Population: 5,546)
- Sibley (Population: 2,796)
- Sidney (Population: 1,300)
- Sigourney (Population: 2,209)
- Sioux Center (Population: 6,002)
- Sioux City (Population: 85,013)
- Slater (Population: 1,306)
- Sloan (Population: 1,032)
- Solon (Population: 1,177)
- Spencer (Population: 11,317)
- Spirit Lake (Population: 4,261)
- Springville (Population: 1,091)
- St. Ansgar (Population: 1,031)
- State Center (Population: 1,349)
- Storm Lake (Population: 10,076)
- Story City (Population: 3,228)
- Strawberry Point (Population: 1,386)
- Stuart (Population: 1,712)
- Sumner (Population: 2,106)
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