Ohio 41,537 Oregon 29,161 Ontario 24,967 Oklahoma 15,813 Oceania 10,976 Outer space 5,659 Oxford 5,008 OECD countries 4,981 Oman 4,313 Odisha 3,151 Orient 2,599 Okinawa-ken 2,478 Oxford (England) 2,289 Ohio River Valley 2,178 Okinawa-ken (Japan) 2,078 Orissa 2,065 Osaka 1,860 Oaxaca (State) 1,816 Orange County 1,705 Oakland 1,634 Ohio River 1,565 Oaxaca (Mexico : State) 1,393 Odisha (India) 1,371 Odesa 1,328 Osmanisches Reich 1,307 Osaka (Japan) 1,305 Orissa (India) 1,249 Odesa (Ukraine) 1,202 Oslo 1,054 Oaxaca 1,045 Oakland (Calif.) 1,012 Oxfordshire 897 Oxfordshire (England) 880 Ottawa 879 Oregon Territory 856 Okinawa Island 849 Osteuropa 818 Oregon National Historic Trail 751 Orkney (Scotland) 728 Ouganda 715 Ozark Mountains 663 Omaha 644 Old Northwest 639 Orkney 605 Oslo (Norway) 568 Österreich 568 Omaha (Neb.) 548 Ostfriesland 545 Odessa 538 Orange County (Calif.) 526 Ostfriesland (Germany) 508 Osaka (Prefecture) 498 Ostasien 495 Ottawa (Ont.) 483 Oahu 475 Oldenburg 465 Okayama-ken 459 Okinawa Island (Japan) 459 Oceania Region 453 Ostroh 451 Oklahoma City 449 Okayama-ken (Japan) 443 Osaka (Japan : Prefecture) 441 Onondaga County 414 Ohio River Region 398 Occident 394 Oświęcim 377 Océanie 375 Ontario, Lake (N.Y. and Ont.) 358 Oneida County 356 Old Southwest 331 Oświęcim 329 Oudh (India) 323 Omsk 320 Oklahoma City (Okla.) 308 Orvieto 306 Orange County (N.Y.) 293 Onondaga County (N.Y.) 292 Oudh 289 Orenburgskai︠a︡ oblastʹ (Russia) 286 Ontario, Northern 284 Ostia (Extinct city) 282 Orange 281 Oldenburg (Germany) 274 Oran 274 Oran (Algeria) 272 Orlovskai︠a︡ oblastʹ 271 Osnabrück (Germany) 271 Oaxaca de Juárez (Mexico) 266 Oder-Neisse Line (Germany and Poland) 266 Orléans 266 Orléans (France) 266 Orlando 265 Omsk (Russia) 264 Oberpfalz 263 Olympic National Park (Wash.) 263 Osnabrück 263 Olomouc 262 Oneida County (N.Y.) 253 Ozark Mountains Region 253