Cities: O

Rank Population City Alternative city name(s) Country 24,420 Oadby England 32,803 Oakengates / Donnington England 400,829 Oakland United States of America 12,795 Oamaru New Zealand 284,539 Oaxaca Mexico 24,498 Ob' Russia 54,356 Obando Philippines 56,235 Oberá Argentina 221,619 Oberhausen Germany 175,473 Obihiro Japan 109,941 Obninsk Russia 6,312 Obo Central African Republic 117,837 Obosi Nigeria 55,377 Obra Taxco de Alarcón India 163,349 Obuasi Ghana 83,681 Ocańa Colombia 171,444 Oceanside United States of America 27,680 Ocha Russia 19,238 Ochamchira Georgia 27,047 Ocotal Nicaragua 84,682 Ocotlán Mexico 120,355 Ocumare del Tuy Venezuela 203,128 Odawara Japan 21,139 Odder Denmark 66,599 Ödemis Turkey 185,232 Odense Denmark 36,647 Oder Schwedt Germany 301 1,029,366 Odesa Odessa Ukraine 71,587 Odienné Côte d'Ivoire 138,897 Odincovo Russia 53,408 Odivelas Portugal 37,679 Odorheiu Romania 21,643 Oegstgeest Netherlands 35,388 Oeiras Portugal 23,828 Ofaqim Israel 102,737 Offa Nigeria 119,857 Offenbach am Main Germany 59,762 Offenburg Germany 10,204 Oftringen Switzerland 151,079 Ogaki Japan 76,098 Ogaminan Nigeria 568 598,554 Ogbomoso Nigeria 26,878 Ogre Latvia 56,350 Ohafia Nigeria 40,372 Ohrid Macedonia 25,737 Oisterwijk Netherlands 796 448,954 Oita Japan 117,844 Ojo de Agua Mexico 61,246 Oka Akoko Nigeria 21,502 Okahandja Nambia 260,261 Okara Pakistan 80,527 Okara Cantonment Pakistan 516 641,167 Okayama Japan 350,104 Okazaki Japan 432,332 Okene Nigeria 50,260 Okhtyrka Ukraine 88,851 Okigwi Nigeria 126,103 Okinawa Japan 58,143 Okitipupa Nigeria 660 532,517 Oklahoma City United States of America 6,886 Okondja Gabon 145,311 Okpogho Nigeria 112,733 Okrika Nigeria 111,112 Okt'abr'skij Russia 24,945 Oktjabr'sk Russia 16,138 Ol Kalou Kenya 12,854 Olaine Latvia 111,521 Olathe United States of America 102,055 Olavarría Argentina 31,359 Olawa Poland 137,528 Oldbury / Smethwick England 23,165 Oldebroek Netherlands 159,184 Oldenburg Oldenburg Germany 31,660 Oldenzaal Netherlands 102,898 Oldham England 30,602 Oleiros Spain 95,586 Oleksandriya Ukraine 25,214 Olenegorsk Russia 37,722 Olesnica Poland 20,112 Ölgij Mongolia 32,232 Olhăo Portugal 372,411 Olinda Brazil 24,545 Oliveira do Douro Portugal 39,325 Olkusz Poland 100,538 Olomouc Czech Republic 28,476 Olot Spain 178,393 Olsztyn Poland 16,314 Olten Switzerland 45,087 Olympia United States of America 411,630 Omaha United States of America 58 2,956,894 Omdurman Umm Durman Sudan 50,866 Omidiyeh Iran 741 480,632 Omiya Japan 262 1,148,755 Omsk Russia 133,885 Omuta Japan 8,922 Onchan Isle of Man 9,279 Ondangwa Nambia 201,878 Ondo Nigeria 19,940 Öndörhaan Mongolia 23,341 Onega Russia 7,862 Onetangi Waiheke Island New Zealand 16,616 Onex Switzerland 733 484,173 Onitsha Nigeria 750 Ono Wallis and Futuna 171,849 Ontario United States of America 33,531 Ontinyent Spain 67,412 Oostende Ostende Belgium 53,778 Oosterhout Netherlands 27,208 Oosterwolde Ooststellingwerf Netherlands 60,028 Opava Czech Republic 12,657 Opfikon Switzerland 23,579 Opoczno Poland 131,485 Opole Poland 23,629 Oppegĺrd Norway 4,957 Opuwo Nambia 30,344 Or Yehuda Israel 209,571 Oradea Romania 20,371 Orahovac Rrahovec Kosovo 159,202 Orai India 204,946 Oral Ural'sk Kazakhstan 409 771,066 Oran Wahran Algeria 134,525 Orange United States of America 36,597 Orange Australia 14,964 Orange Walk Belize 29,998 Oranjestad Aruba 10,067 Orapa Botswana 3,423 Orašje Bosnia and Herzegovina 4,418 Ordot Guam 126,767 Ordu Turkey 319,497 Ordzonikidse Vladikavkaz Russia 64,532 Ordžonikidzevskaja Russia 126,314 Örebro Sweden 121,594 Orechovo-Zujevo Russia 336,743 Orel Or'ol Russia 625 560,524 Orenburg Orenburg Russia 109,017 Orense Ourense Spain 36,841 Orgejev Orhei Moldova 51,057 Orhangazi Turkey 55,922 Orihuela Spain 119,481 Orizaba Mexico 74,092 Orkney South Africa 203,601 Orlando United States of America 115,653 Orléans France 34,099 Orlová Czech Republic 29,794 Ormoc Philippines 23,599 Ormskirk England 54,524 Örnsköldsvik Sweden 19,778 Orodara Burkina Faso 72,488 Oron Nigeria 30,999 Orosháza Hungary 20,228 Oroszlány Hungary 130,124 Orša Belarus 252,029 Orsk Russia 584 587,222 Orumiyeh Reza'iyeh Iran 214,058 Oruro Bolivia 23,897 Osa Russia 80 2,588,286 Osaka Japan 132,860 Osan South Korea 475 693,533 Osasco Brazil 207,078 Osh Kyrgyzstan 53,736 Oshakati Nambia 320,008 Oshawa Canada 346,876 Oshogbo Nigeria 87,955 Osijek Croatia 50,483 Osinniki Russia 25,996 Oskarshamn Sweden 322,709 Öskemen Ust'-Kamenogorsk Kazakhstan 668 526,090 Oslo Norway 86,037 Osmanabad India 200,635 Osmaniye Turkey 166,324 Osnabrück Germany 138,222 Osorno Chile 68,919 Oss Netherlands 21,325 Ossett England 20,464 Ostaškov Russia 14,990 Ostermundigen Switzerland 58,337 Östersund Sweden 21,864 Östhammar Sweden 310,652 Ostrau Ostrava Czech Republic 34,370 Ostróda Poland 34,643 Ostrogožsk Russia 56,455 Ostroleka Poland 25,033 Ostrov Russia 23,084 Ostrów Mazowiecka Poland 74,887 Ostrów Wielkopolski Poland 76,785 Ostrowiec Swietokrzyski Poland 12,134 Ostuncalco Guatemala 41,551 Oswiecim Poland 5,692 Otaki New Zealand 145,655 Otaru Japan 33,946 Otavalo Ecuador 26,334 Otjiwarongo Nambia 21,577 Otradnaja Russia 21,773 Otradnoje Russia 50,575 Otradnyj Russia 301,149 Otsu Japan 271 1,112,005 Ottawa Canada 29,924 Ottignies-Louvain-la-Neuve Belgium 115,028 Otukpo Nigeria 42,114 Otwock Poland 311 1,005,231 Ouagadougou Burkina Faso 64,756 Ouahigouya Burkina Faso 93 Ouanary French Guiana 6,271 Ouangani Mayotte 79,600 Ouarzazate Morocco 23,608 Oud-Beijerland Sidi Bouzid Netherlands 29,144 Oudergem Belgium 52,710 Oudtshoorn South Africa 90,206 Oued Zem Morocco 23,968 Ouesso Congo 64,870 Ouezzane Morocco 41,389 Ouidah Benin 777 456,524 Oujda Morocco 55,532 Oulad-Teďma Morocco 128,796 Oulu Finland 78,299 Oumé Côte d'Ivoire 20,078 Oum-Hadjer Chad 15,200 Ouro Sogui Senegal 75,251 Ovalle Chile 41,064 Overbetuwe Valburg Netherlands 166,680 Overland Park United States of America 202,720 Oviedo Spain 21,588 Owando Congo 165,470 Owerri Nigeria 217,263 Owo Nigeria 149,134 Oxford England 185,883 Oxnard United States of America 161,059 Oyama Japan 29,710 Oyem Gabon 692 511,285 Oyo Nigeria 45,356 Ozamis Philippines 37,069 Ózd Hungary 25,664 Ozery Russia 21,171 Ozorków Poland 63,669 Ozubulu Nigeria 17,770 Ozurgeti Georgia