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- Ohio--Zanesville1
- Oklahoma--Tulsa1
- Old Forge, New York, United States1
- Old Lyme, Connecticut, United States1
- Old Orchard Beach, Maine, United States1
- Old Sturbridge Village, Massachusetts, United States1
- Olean, New York, United States1
- Oley, Pennsylvania, United States1
- Olney, Illinois, United States1
- Onamia, Minnesota, United States1
- Onset, Massachusetts, United States1
- Ontario, New York, United States1
- Ontario--Hamilton1
- Ontario--Ottawa1
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- Orange, Virginia, United States1
- Orangeburg, South Carolina, United States1
- Oregon--Ashland1
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- Oregon--Medford1