Ohio, L’, m., the Ohio.
Oldenbourg (oldinboor), m., Oldenburg.
Olympe, m., Olympus.
Olympie, f., Olympia.
Olynthe, f., Olynthus.
Orange, La Colonie du Fleuve, the Orange River Colony.
Orcades, Les, f.pl., the Orkneys, or the Orkney Islands.
Orchomène (-ko-), m., Orchomenus.
Orégon, L’, m., Oregon.
Orenbourg (orinbour), m., Orenburg.