1. Oak Hill, Jackson, Ohio, USA 
2. Oak Township, Smith, Kansas, USA
3. Oakland, Alameda, California, USA
4. Oakland, Carroll, Maryland, USA
5. Oakland, Pottawattamie, Iowa, USA
6. Ocala, Marion, Florida, USA
7. Ocracoke, Hyde, North Carolina, USA
8. Odell, Livingston, Illinois, USA
9. Ogden, Weber, Utah, USA
10. Ohio City, Gallia, Ohio, USA
11. Ohio, USA
12. Oklahoma City, Oklahoma, Oklahoma, USA
13. Oklahoma, USA
14. Old Hickory, Davidson County, Tennessee, USA
15. Oliver Township, Mifflin, Pennsylvania, USA
16. Oliver, Mifflin, Pennsylvania, USA (1)
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17. Olney, Richland, Illinois, USA
18. Olympia, Thurston, Washington, USA
19. Omaha, Douglas, Nebraska, USA
20. Onboard Ship, Nancy
21. Oneida Township, Huntingdon, Pennsylvania, USA
22. Ontario, Canada
23. Ontario, San Bernardino, California, USA
24. Orange County, California, USA
25. Orbisonia, Huntingdon, Pennsylvania, USA
26. Oregon City, Clackamas, Oregon, USA
27. Oregon County, Missouri, USA
28. Oregon, USA
29. Orlando, Orange, Florida, USA
30. Orleans, Harlan, Nebraska, USA
31. Orléans, Loiret, Centre, France
32. Oroville, Butte, California, USA
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33. Osage City, Osage, Kansas, USA
34. Osage, Kansas, USA
35. Osage, Mitchell, Iowa, USA
36. Osawatomie, Miami, Kansas, USA
37. Osterdock, Clayton, Iowa, USA
38. Otho, Webster, Iowa, USA
39. Otsego, Otsego, New York, USA
40. Otterville, Cooper, Missouri, USA
41. Ovington, Essex, England
42. Owego, Livingston, Illinois, USA
43. Oxford, Butler, Ohio, USA
44. Oxford, New Haven, Connecticut, USA
45. Oxford, Oxfordshire, England
46. Oyster Bay, Nassau, New York, USA
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