- Oakdale (Population: 8,075)
- Oakfield (Population: 3,203)
- Oceanside (Population: 32,733)
- Ogden (Population: 18,492)
- Ogdensburg (Population: 12,364)
- Olcott (Population: 1,156)
- Old Bethpage (Population: 5,400)
- Old Brookville (Population: 2,167)
- Old Westbury (Population: 4,228)
- Olean (Population: 15,347)
- Olive (Population: 4,579)
- Oneida (Population: 10,987)
- Oneonta (Population: 13,292)
- Onondaga (Population: 21,063)
- Ontario (Population: 9,778)
- Oppenheim (Population: 1,774)
- Orange Lake (Population: 6,085)
- Orange (Population: 1,752)
- Orangeburg (Population: 3,388)
- Orangetown (Population: 47,711)
- Orangeville (Population: 1,301)
- Orchard Park (Population: 27,637)
- Oriskany (Population: 1,459)
- Orleans (Population: 2,465)
- Orwell (Population: 1,254)
- Ossining (Population: 36,534)
- Oswegatchie (Population: 4,370)
- Oswego (Population: 17,954)
- Otego (Population: 3,183)
- Otisco (Population: 2,561)
- Otsego (Population: 3,904)
- Otselic (Population: 1,001)
- Ovid (Population: 2,757)
- Owasco (Population: 3,755)
- Owego (Population: 20,365)
- Oxford (Population: 3,992)
- Oyster Bay Cove (Population: 2,262)
- Oyster Bay (Population: 293,925)
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