Ohio 41,522 Oregon 29,154 Ontario 24,973 Oklahoma 15,821 Oceania 10,987 Outer space 5,668 Oxford 5,007 OECD countries 4,983 Oman 4,323 Odisha 3,155 Orient 2,598 Okinawa-ken 2,479 Oxford (England) 2,290 Ohio River Valley 2,160 Okinawa-ken (Japan) 2,083 Orissa 2,065 Osaka 1,865 Oaxaca (State) 1,819 Orange County 1,707 Oakland 1,635 Ohio River 1,560 Oaxaca (Mexico : State) 1,396 Odisha (India) 1,374 Osmanisches Reich 1,331 Odesa 1,330 Osaka (Japan) 1,307 Orissa (India) 1,250 Odesa (Ukraine) 1,202 Oslo 1,054 Oaxaca 1,047 Oakland (Calif.) 1,013 Oxfordshire 897 Ottawa 881 Oxfordshire (England) 880 Okinawa Island 850 Oregon Territory 850 Osteuropa 815 Oregon National Historic Trail 752 Orkney (Scotland) 728 Ouganda 726 Ozark Mountains 668 Omaha 644 Old Northwest 639 Orkney 605 Oslo (Norway) 568 Österreich 565 Omaha (Neb.) 548 Ostfriesland 545 Odessa 539 Orange County (Calif.) 527 Ostfriesland (Germany) 508 Osaka (Prefecture) 499 Ostasien 491 Ottawa (Ont.) 483 Oahu 475 Oldenburg 466 Okayama-ken 463 Okinawa Island (Japan) 459 Oceania Region 453 Ostroh 451 Oklahoma City 449 Okayama-ken (Japan) 444 Osaka (Japan : Prefecture) 441 Onondaga County 414 Occident 402 Ohio River Region 398 Océanie 386 Oświęcim 377 Oneida County 356 Ontario, Lake (N.Y. and Ont.) 356 Old Southwest 335 Oświęcim 329 Oudh (India) 324 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 Oran (Algeria) 272 Osnabrück (Germany) 272 Orlovskai︠a︡ oblastʹ 271 Oaxaca de Juárez (Mexico) 267 Oder-Neisse Line (Germany and Poland) 267 Orléans 267 Orléans (France) 267 Osnabrück 265 Omsk (Russia) 264 Orlando 264 Oberpfalz 263 Olympic National Park (Wash.) 263 Olomouc 262 Oneida County (N.Y.) 253 Ozark Mountains Region 253