Oberlin
Ocklawaha River, Florida
Ocklockonee River, Florida
Ocmulgee River, Georgia
Oconee River, Georgia
Ogdensburg, New York
Ohio
Okeechobee Lake, Florida
Okefinokee Swamp, Georgia
Oklahoma
Old Bailey, The
Old Dominion
Old Point Comfort
Olympia
Omaha
Oneida Lake, New York
Onondaga Lake, New York
Ontario
Opelika, Alabama
Orange Free State
Oregon
Orkney Isles
Orlando
Orleans
Osage River, Mo
Osawattomie, Kansas
Oskaloosa, Kansas
Oswego, New York
Otho, or Otto
Ottawa
Ottoman Empire
Owego, New York
Owen
Oxford
Ozark

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