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- Orkney Springs, Virginia, United States1
- Orlando, Florida, United States5
- Oroville, California, United States1
- Orrville, Alabama1
- Orvieto (Italy)1
- Oscoda, Michigan, United States1
- Oshkosh, Wisconsin, United States1
- Ossipee, New Hampshire, United States1
- Oswego, New York, United States2
- Ottawa, Kansas, United States1
- Ottumwa, Iowa, United States1
- Owosso, Michigan, United States1
- Oxford (Mass.)2
- Oxford, Alabama1
- Oxford, New York, United States1
- Oxford, Pennsylvania, United States1
- Oxyrhynchus [Bahnasā], Minya Governatorate, Egypt32
- Ozark, Alabama1
- Painsville, Ohio, United States1
- Paint Rock, Alabama1