1. Sac City, Iowa, USA
2. Sanborn, Iowa, USA
3. Sciola, Iowa, USA
4. Scott County, Iowa, USA (3)
5. Scranton, Iowa, USA
6. Shenandoah, Iowa, USA
7. Sherman Township, Iowa, USA
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8. Sigourney, Iowa, USA
9. Sioux City, Iowa, USA
10. Sioux Rapids, Iowa, USA
11. Spencer, Iowa, USA
12. Spirit Lake, Iowa, USA
13. Spring Grove Township, Iowa, USA
14. Stanton, Iowa, USA
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15. Storm Lake, Iowa, USA
16. Story County, Iowa, USA (2)
17. Stuart, Iowa, USA
18. Summit Township, Iowa, USA
19. Sumner, Iowa, USA
20. Sutherland, Iowa, USA
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