1. Carlisle, Iowa, USA
2. Carroll County, Iowa, USA (1)
3. Carroll, Iowa, USA (2)
4. Carson, Iowa, USA
5. Cass County, Iowa, USA
6. Castana, Iowa, USA
7. Cedar Rapids, Iowa, USA
8. Cedar Township, Iowa, USA
9. Centerville, Iowa, USA
10. Central City, Iowa, USA
11. Cerro Gordo County, Iowa, USA (3)
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12. Chariton, Iowa, USA
13. Charles City, Iowa, USA
14. Cherokee County, Iowa, USA
15. Cherokee, Iowa, USA
16. Chickasaw County, Iowa, USA
17. Churdan, Iowa, USA
18. Clay County, Iowa, USA (2)
19. Clay Township, Iowa, USA
20. Clayton County, Iowa, USA (2)
21. Clear Lake, Iowa, USA
22. Clermont, Iowa, USA
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23. Climbing Hill, Iowa, USA
24. Clinton County, Iowa, USA (2)
25. Clinton, Iowa, USA
26. Coldwater Township, Iowa, USA
27. Concord Township, Iowa, USA
28. Corwith, Iowa, USA
29. Council Bluffs, Iowa, USA (2)
30. Crawford County, Iowa, USA (1)
31. Creston, Iowa, USA
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