Ohio 41,553 Oregon 29,168 Ontario 24,981 Oklahoma 15,821 Oceania 10,991 Outer space 5,666 Oxford 5,010 OECD countries 4,982 Oman 4,320 Odisha 3,153 Orient 2,599 Okinawa-ken 2,485 Oxford (England) 2,290 Ohio River Valley 2,178 Okinawa-ken (Japan) 2,082 Orissa 2,065 Osaka 1,870 Oaxaca (State) 1,818 Orange County 1,706 Oakland 1,635 Ohio River 1,565 Oaxaca (Mexico : State) 1,396 Odisha (India) 1,372 Odesa 1,330 Osmanisches Reich 1,323 Osaka (Japan) 1,308 Orissa (India) 1,249 Odesa (Ukraine) 1,202 Oslo 1,054 Oaxaca 1,047 Oakland (Calif.) 1,013 Oxfordshire 898 Ottawa 881 Oxfordshire (England) 880 Oregon Territory 856 Okinawa Island 850 Osteuropa 814 Oregon National Historic Trail 752 Orkney (Scotland) 728 Ouganda 720 Ozark Mountains 667 Omaha 644 Old Northwest 639 Orkney 605 Oslo (Norway) 568 Österreich 565 Omaha (Neb.) 548 Ostfriesland 545 Odessa 539 Orange County (Calif.) 526 Ostfriesland (Germany) 508 Osaka (Prefecture) 499 Ostasien 494 Ottawa (Ont.) 483 Oahu 475 Oldenburg 466 Okayama-ken 465 Okinawa Island (Japan) 459 Oceania Region 453 Ostroh 451 Oklahoma City 449 Okayama-ken (Japan) 445 Osaka (Japan : Prefecture) 441 Onondaga County 414 Occident 399 Ohio River Region 398 Océanie 384 Oświęcim 377 Ontario, Lake (N.Y. and Ont.) 358 Oneida County 356 Old Southwest 335 Oświęcim 329 Oudh (India) 323 Omsk 321 Oklahoma City (Okla.) 308 Orvieto 306 Orange County (N.Y.) 293 Onondaga County (N.Y.) 292 Oudh 289 Ontario, Northern 286 Orenburgskai︠a︡ oblastʹ (Russia) 286 Ostia (Extinct city) 282 Orange 281 Oldenburg (Germany) 275 Oran 274 Orlovskai︠a︡ oblastʹ 274 Oran (Algeria) 272 Osnabrück (Germany) 272 Orléans 268 Oder-Neisse Line (Germany and Poland) 267 Orléans (France) 267 Oaxaca de Juárez (Mexico) 266 Orlando 265 Osnabrück 265 Omsk (Russia) 264 Oberpfalz 263 Olympic National Park (Wash.) 263 Olomouc 262 Oneida County (N.Y.) 253 Ozark Mountains Region 252