Cities around the world with population greater than 50,000 starting with the letter O
| City | Population | Country |
|---|---|---|
| Osaka | 2,592,413 | Japan |
| Ordos | 1,940,653 | China |
| Omdurman | 1,200,000 | Sudan |
| Omsk | 1,129,281 | Russia |
| Ouagadougou | 1,086,505 | Burkina Faso |
| Odessa | 1,001,558 | Ukraine |
| Ottawa | 812,129 | Canada |
| Oyo | 736,072 | Nigeria |
| Osasco | 677,856 | Brazil |
| Oran | 645,984 | Algeria |
| Okayama | 639,652 | Japan |
| Oklahoma City | 631,346 | United States |
| Oslo | 580,000 | Norway |
| Orumiyeh | 577,307 | Iran |
| Onitsha | 561,066 | Nigeria |
| Orenburg | 550,204 | Russia |
| Okene | 479,178 | Nigeria |
| Oita | 448,907 | Japan |
| Omaha | 443,885 | United States |
| Oakland | 419,267 | United States |
| Oujda-Angad | 405,253 | Morocco |
| Olinda | 366,754 | Brazil |
| Okazaki | 352,361 | Japan |
| Orel | 324,200 | Russia |
| Ostrava | 313,088 | Czech Republic |
| Otsu | 298,164 | Japan |
| Okanagan | 297,601 | Canada |
| Owo | 276,574 | Nigeria |
| Orlando | 270,934 | United States |
| Ondo | 257,005 | Nigeria |
| Oaxaca | 255,029 | Mexico |
| Oshawa | 247,989 | Canada |
| Orsk | 246,836 | Russia |
| Ojo de Agua | 242,272 | Mexico |
| Oviedo | 224,005 | Spain |
| Okara | 223,648 | Pakistan |
| Olongapo | 221,178 | Philippines |
| Oberhausen | 219,176 | Germany |
| Owerri | 215,038 | Nigeria |
| Oruro | 208,684 | Bolivia |
| Oxnard | 207,254 | United States |
| Oradea | 206,614 | Romania |
| Odawara | 203,035 | Japan |
| Osmaniye | 202,837 | Turkey |
| Osh | 200,000 | Kyrgyzstan |
| Oral | 200,000 | Kazakhstan |
| Ormoc | 191,200 | Philippines |
| Overland Park | 186,515 | United States |
| Oceanside | 175,691 | United States |
| Obihiro | 173,890 | Japan |
| Ongole | 172,872 | India |
| Olsztyn | 171,803 | Poland |
| Oxford | 171,380 | United Kingdom |
| Ontario | 171,214 | United States |
| Osnabrueck | 166,462 | Germany |
| Ocumare del Tuy | 166,072 | Venezuela |
| Oakville | 165,697 | Canada |
| Oyama | 159,936 | Japan |
| Oldenburg | 159,218 | Germany |
| Osan | 158,978 | South Korea |
| Orai | 158,265 | India |
| Osogbo | 156,694 | Nigeria |
| Ota | 152,104 | Japan |
| Ogaki | 150,570 | Japan |
| Ome | 149,323 | Japan |
| Odense | 145,931 | Denmark |
| Orkney | 145,801 | South Africa |
| Orekhovo-Borisovo | 144,000 | Russia |
| Otaru | 143,792 | Japan |
| Orange | 140,992 | United States |
| Obuase | 137,856 | Ghana |
| Odintsovo | 137,041 | Russia |
| Osorno | 135,773 | Chile |
| Okap | 134,815 | Haiti |
| Olathe | 134,305 | United States |
| Okrika | 133,271 | Nigeria |
| Omuta | 131,974 | Japan |
| Ouargla | 129,402 | Algeria |
| Oulu | 128,618 | Finland |
| Orekhovo-Borisovo Severnoye | 128,000 | Russia |
| Opole | 127,676 | Poland |
| Okinawa | 125,483 | Japan |
| Orsha | 125,347 | Belarus |
| Orleans | 124,149 | France |
| Olmaliq | 121,207 | Uzbekistan |
| Orizaba | 120,844 | Mexico |
| Orekhovo-Zuyevo | 120,000 | Russia |
| Offenbach | 119,192 | Germany |
| Odessa | 118,968 | United States |
| Ordu | 116,788 | Turkey |
| OErebro | 115,765 | Sweden |
| Okigwe | 115,499 | Nigeria |
| Ochakovo-Matveyevskoye | 114,000 | Russia |
| Offa | 113,830 | Nigeria |
| Oktyabr'skiy | 108,200 | Russia |
| Ourense | 107,742 | Spain |
| Obninsk | 107,392 | Russia |
| Oldham | 104,782 | United Kingdom |
| Ottakring | 104,627 | Austria |
| Oleksandriya | 103,000 | Ukraine |
| Olomouc | 101,268 | Czech Republic |
| Oum el Bouaghi | 100,821 | Algeria |
| Ooty | 98,238 | India |
| Ourinhos | 97,799 | Brazil |
| Olupona | 95,002 | Nigeria |
| Ozerki | 95,000 | Russia |
| Onojo | 94,957 | Japan |
| Orem | 94,457 | United States |
| Ochota | 93,192 | Poland |
| Ozamiz City | 93,082 | Philippines |
| Onomichi | 90,936 | Japan |
| Omura | 89,918 | Japan |
| Osijek | 88,140 | Croatia |
| Olavarria | 86,320 | Argentina |
| Orihuela | 86,164 | Spain |
| Osmanabad | 85,521 | India |
| Ogden | 85,444 | United States |
| O'Fallon | 85,040 | United States |
| Oued Zem | 84,910 | Morocco |
| Ogaminana | 84,373 | Nigeria |
| Ocotlan | 83,769 | Mexico |
| Ocana | 83,511 | Colombia |
| Ouidah | 83,503 | Benin |
| Ozersk | 81,023 | Russia |
| Oke Mesi | 79,563 | Nigeria |
| Obu | 77,864 | Japan |
| Ovalle | 77,138 | Chile |
| Oss | 76,430 | Netherlands |
| Ode | 75,463 | Nigeria |
| Okegawa | 75,062 | Japan |
| Ostrowiec Swietokrzyski | 73,989 | Poland |
| Ozubulu | 73,812 | Nigeria |
| Oyan | 73,622 | Nigeria |
| Ohafia-Ifigh | 73,355 | Nigeria |
| Ostrow Wielkopolski | 72,898 | Poland |
| Orita Eruwa | 71,027 | Nigeria |
| Omihachiman | 69,189 | Japan |
| Ostend | 69,011 | Belgium |
| Obonoma | 68,584 | Nigeria |
| OEdemis | 67,153 | Turkey |
| Oulad Teima | 66,832 | Morocco |
| Oshkosh | 66,555 | United States |
| Odate | 64,543 | Japan |
| Ongjin | 64,247 | North Korea |
| Ouro Preto | 63,678 | Brazil |
| Oroqen Zizhiqi | 61,582 | China |
| Oudtshoorn | 61,507 | South Africa |
| Ouahigouya | 61,096 | Burkina Faso |
| Opava | 60,252 | Czech Republic |
| Ostankinskiy | 60,000 | Russia |
| Obando | 59,929 | Philippines |
| Oued Rhiou | 59,864 | Algeria |
| Offenburg | 59,238 | Germany |
| Oltinko`l | 59,122 | Uzbekistan |
| Owensboro | 59,042 | United States |
| Otawara | 58,888 | Japan |
| Ouezzane | 58,684 | Morocco |
| Orland Park | 58,619 | United States |
| Ocala | 58,218 | United States |
| Ouarzazat | 57,245 | Morocco |
| Oak Lawn | 56,781 | United States |
| Okcheon | 56,634 | South Korea |
| Obera | 56,528 | Argentina |
| Obra | 56,110 | India |
| Ohrid | 54,908 | North Macedonia |
| Odivelas | 54,624 | Portugal |
| Okaya | 54,286 | Japan |
| Ozone Park | 53,985 | United States |
| Ostroleka | 53,740 | Poland |
| Oami | 53,239 | Japan |
| Oosterhout | 53,107 | Netherlands |
| Oak Park | 52,287 | United States |
| Oume | 52,070 | Ivory Coast |
| Orhangazi | 51,792 | Turkey |
| Ottappalam | 50,913 | India |
| Oshnaviyeh | 50,661 | Iran |
| Oi | 50,593 | Japan |
| Olympia | 50,302 | United States |
| Ono | 50,230 | Japan |
| Otradnyy | 50,127 | Russia |