Ohio 41,567 Oregon 29,181 Ontario 25,001 Oklahoma 15,847 Oceania 10,999 Outer space 5,678 Oxford 5,031 OECD countries 4,978 Oman 4,352 Odisha 3,167 Orient 2,593 Okinawa-ken 2,480 Oxford (England) 2,292 Ohio River Valley 2,165 Okinawa-ken (Japan) 2,087 Orissa 2,062 Osaka 1,871 Oaxaca (State) 1,821 Orange County 1,708 Oakland 1,641 Ohio River 1,560 Oaxaca (Mexico : State) 1,397 Odisha (India) 1,382 Odesa 1,332 Osaka (Japan) 1,310 Orissa (India) 1,249 Osmanisches Reich 1,227 Odesa (Ukraine) 1,204 Oslo 1,055 Oaxaca 1,043 Oakland (Calif.) 1,015 Oxfordshire 899 Ottawa 885 Oxfordshire (England) 880 Okinawa Island 853 Oregon Territory 850 Osteuropa 788 Ouganda 758 Oregon National Historic Trail 752 Orkney (Scotland) 728 Ozark Mountains 670 Omaha 644 Old Northwest 640 Orkney 603 Oslo (Norway) 569 Österreich 554 Omaha (Neb.) 548 Ostfriesland 544 Odessa 541 Orange County (Calif.) 527 Ostfriesland (Germany) 508 Osaka (Prefecture) 499 Ottawa (Ont.) 484 Oahu 478 Oldenburg 466 Okayama-ken 464 Ostasien 464 Okinawa Island (Japan) 459 Oceania Region 452 Ostroh 451 Oklahoma City 448 Okayama-ken (Japan) 445 Osaka (Japan : Prefecture) 442 Occident 423 Onondaga County 414 Ohio River Region 398 Océanie 395 Oświęcim 379 Oneida County 357 Ontario, Lake (N.Y. and Ont.) 356 Old Southwest 335 Oświęcim 328 Oudh (India) 324 Omsk 322 Orvieto 309 Oklahoma City (Okla.) 308 Onondaga County (N.Y.) 291 Orange County (N.Y.) 291 Oudh 289 Orenburgskai︠a︡ oblastʹ (Russia) 287 Ontario, Northern 286 Orange 284 Ostia (Extinct city) 284 Oldenburg (Germany) 276 Oran 274 Oran (Algeria) 272 Orlovskai︠a︡ oblastʹ 272 Osnabrück (Germany) 272 Oder-Neisse Line (Germany and Poland) 270 Oaxaca de Juárez (Mexico) 267 Orléans 267 Orléans (France) 267 Orlando 266 Osnabrück 266 Oberpfalz 264 Omsk (Russia) 264 Olomouc 263 Olympic National Park (Wash.) 263 Oneida County (N.Y.) 254 Ozark Mountains Region 253