1. Oak Grove, Michigan, USA 
2. Oakland County, Michigan, USA (2)
3. Oakville, Michigan, USA
4. Oakwood, Michigan, USA
5. Oceana County, Michigan, USA (3)
6. Okemos, Michigan, USA
7. Old Mission Point Township, Michigan, USA
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8. Olive Township, Michigan, USA
9. Oneida Township, Michigan, USA
10. Onekama, Michigan, USA
11. Onondaga, Michigan, USA
12. Onsted, Michigan, USA
13. Ontonagon, Michigan, USA
14. Orangeville Township, Michigan, USA
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15. Osceola County, Michigan, USA (3)
16. Oshtemo Township, Michigan, USA (2)
17. Otsego Township, Michigan, USA
18. Otsego, Michigan, USA
19. Ottawa County, Michigan, USA (4)
20. Owosso, Michigan, USA (2)
21. Oxford, Michigan, USA
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