Estados Unidos
Países do mundo
O
- (Clarke County) Oceanport
- (Clay County) Ocean Shores
- (Marengo County) Oreland
- Okeechobee
- (Marengo County) Ocean City
- (Franklin County) Old Bethpage
- (Cleburne County) Oxford
- (Cherokee County) Old Fig Garden
- (Cherokee County) Oak Park
- (Greene County) Orchard Homes
- (Pickens County) Odessa
- (Houston County) Olyphant
- (Coffee County) Olympia Fields
- (Covington County) Osceola
- (Choctaw County) Ocean Bluff-Brant Rock
- Orange
- (Dallas County) Omak
- (Jefferson County) Oak Park Heights
- (DeKalb County) Obetz
- (Coosa County) Oak Hill
- (Franklin County) Old Westbury
- Ossipee
- (Houston County) Offutt Air Force Base
- (Montgomery County) Ogallala
- (Macon County) Orangeburg
- (Limestone County) Oconto
- (Marshall County) Ottawa Hills
- (Cleburne County) Osage Beach
- (Liberty County) Oak Grove
- (Winston County) Okauchee Lake