- Oakdale
- Oceanside
- Odessa
- Oxford
- Orient
- Oakdale
- Orangeburg
- Oak Beach
- Oaks Corners
- Obernburg
- Old Forge
- Olivebridge
- Olmsteadville
- Ontario
- Orangeburg, Saratoga
- Orwell
- Oswegatchie
- Otto
- Ouaquaga
- Owls Head
- Oxbow
- Ozone Park
- Oakfield
- Ocean Beach
- Ogdensburg
- Olcott
- Old Bethpage
- Old Brookville
- Old Field
- Old Westbury
