Towns
| State | City/Town | Town Title |
|---|---|---|
| New York | Old Westbury | Old Westbury, NY |
| New York | Olean | Olean, NY |
| New York | Olivebridge | Olivebridge, NY |
| New York | Olmstedville | Olmstedville, NY |
| New York | Oneida | Oneida, NY |
| New York | Oneonta | Oneonta, NY |
| New York | Ontario | Ontario, NY |
| New York | Ontario Center | Ontario Center, NY |
| New York | Orangeburg | Orangeburg, NY |
| New York | Orchard Park | Orchard Park, NY |
| New York | Orient | Orient, NY |
| New York | Oriskany | Oriskany, NY |
| New York | Oriskany Falls | Oriskany Falls, NY |
| New York | Orwell | Orwell, NY |
| New York | Ossining | Ossining, NY |
| New York | Oswegatchie | Oswegatchie, NY |
| New York | Oswego | Oswego, NY |
| New York | Otego | Otego, NY |
| New York | Otisville | Otisville, NY |
| New York | Otto | Otto, NY |
| New York | Ouaquaga | Ouaquaga, NY |
| New York | Ovid | Ovid, NY |
| New York | Owego | Owego, NY |
| New York | Owls Head | Owls Head, NY |
| New York | Oxbow | Oxbow, NY |