Alabama Cities:
- Oakworth
- Oaky Grove
- Oaky Streak
- Octagon
- Oden Ridge
- Odena
- Odenville
- Odom
- Ofelia
- Ohatchee (corporate Name For Ohatchie)
- Ohatchie (corporate Name Ohatchee)
- Old Bethel
- Old Burleson
- Old Davistown
- Old Kingston
- Old Maylene
- Old Monrovia
- Old Nauvoo
- Old Samuel
- Old Spring Hill
- Old Texas
- Old Town
- Oldfield
- Oleander
- Oliver
- Olmsted
- Olustee
- Omaha
- Oneonta
- Onycha
- Opelika
- Opine
- Opp
- Orange Beach
- Orion
- Orrville
- Orrville (orville)
- Osanippa
- Osborn
- Oswichee
- Our Town
- Overbrook
- Overlook
- Overton
- Owassa
- Owens Crossroads
- Oxanna
- Oxford
- Oxford Lake
- Oxmoor
- Ozark
- Paint Rock
- Painter
- Palestine
- Palmerdale (palmers)
- Palmers Crossroads
- Palmetto
- Palmetto Beach
- Palos
- Panola
- Pansey
- Paran
- Park City
- Park Hill
- Parkdale
- Parkland
- Parkwood
- Parrish
- Partridge Crossroads
- Patsburg
- Patton (patton Junction)
- Patton Chapel
- Paul
- Pauls Hill
- Pawnee (pawnee Heights)
- Pea Ridge
- Peacock
- Pearson
- Peavy
- Pebble
- Peeks Corner
- Peeks Hill
- Peets Corner
- Pelham
- Pelham Heights
- Pell City
- Penfield Heights
- Penn
- Pennington
- Pennsylvania
- Penton