O
- Oakdale
- Oak Forest
- Oak Forest
- Oak Grove
- Oak Grove
- Oak Grove
- Oak Grove
- Oak Grove
- Oak Grove
- Oak Grove
- Oak Hall
- Oakhill
- Oak Hill
- Oak Hill
- Oak Hill
- Oak Hill Corner
- Oak Hills
- Oakland
- Oakland
- Oakland Park
- Oak Lawn
- Oak Level
- Oakley
- Oakley Landing
- Oakpark
- Oak Ridge
- Oak Row
- Oak Shade
- Oaks of Shenandoah
- Oakton
- Oaktree
- Oakville
- Oakwood
- Oakwood
- Oatlands
- Ocala
- Occoquan
- Occupacia
- Ocoonita
- Octagon
- Odricks Corner
- Office Hall
- Ogburn
- Oilville
- Old Bandana
- Old Church
- Old Cold Harbor
- Olde Hunting Hills
- Oldfields
- Old Glade Spring
- Old Gun
- Oldhams
- Old Mill
- Old Mount Vinco
- Old Myndus
- Oldrag
- Old Somerset
- Old Stage Run
- Old Sycamore
- Old Tavern
- Oldtown
- Old Trap
- Old Trower
- Olean
- Olinger
- Olive
- Oliver
- Olivers Corner
- Oliveville
- Olney Corner
- Omaha
- Omega
- Onancock
- Onemo
- Onley
- Ontario
- Opal
- Open Fork
- Opequon
- Ophelia
- Opie
- Oral Oaks
- Oranda
- Orange
- Orapax Farms
- Orchid
- Ordinary
- Ordsburg
- Oreton
- Orgainville
- Oriskany
- Orkney Springs
- Orlean
- Oronoco
- Osaka
- Osborne Gap
- Osborn Landing
- Osborns Store
- Osceolo
- Osso
- Othma
- Otterdale
- Otterdam Mobile Home Park
- Otter Hill
- Otterville
- Ottobine
- Ottoman
- Ottoway
- Ourtown
- Overall
- Overlook Heights
- Overton
- Owens
- Owens
- Owens
- Owensville
- Owenton
- Owl Trap
- Oxford Furnace
- Oyster
- Ozeana