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- Oregon315
- Oregon--Portland222
- Orange County (N.Y.)106
- Ohio--Columbus92
- Oxyrhynchus [Bahnasā], Minya Governatorate, Egypt32
- Oklahoma25
- Ohio--Cincinnati17
- Ohio--Yellow Springs16
- Ohio--Cleveland15
- Ohio--Toledo11
- Ontario--Toronto10
- Ohio--Dublin8
- Ocean Grove, New Jersey, United States7
- Ocean City, New Jersey, United States6
- Omaha, Nebraska, United States6
- Oceania5
- Orlando, Florida, United States5
- Oxford, Alabama5
- Ohio--Westerville4
- Oneonta, New York, United States4