1. Malvern, Iowa, USA 
2. Manhaska County, Iowa, USA
3. Maple River Township, Iowa, USA (2)
4. Maquoketa, Iowa, USA (2)
5. Marble Rock, Iowa, USA
6. Marcy Township, Iowa, USA
7. Marion, Iowa, USA
8. Marshalltown, Iowa, USA
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9. Mason City, Iowa, USA (2)
10. McCallsburg, Iowa, USA
11. Meadow Township, Iowa, USA
12. Melrose Township, Iowa, USA
13. Meriden, Iowa, USA
14. Milford, Iowa, USA
15. Missouri Valley, Iowa, USA (2)
16. Mitchell County, Iowa, USA
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17. Montgomery County, Iowa, USA (2)
18. Morton Mills, Iowa, USA
19. Moulton, Iowa, USA
20. Mount Ayr, Iowa, USA
21. Moville, Iowa, USA
22. Muscatine, Iowa, USA
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