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1M+ cities of the world by letter - O

Name all 1M+ urban areas that start with O.
According to citypopulation.de, 29/02/25
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KiwiJami
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Last updated: April 12, 2026
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First submittedMarch 26, 2021
Times taken1,308
Average score72.7%
Rating4.83
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Country
Population
City
Japan
17.70 mil
Osaka
United States
4.05 mil
Orlando
Burkina Faso
3.55 mil
Ouagadougou
Japan
2.17 mil
Okayama
Algeria
1.67 mil
Oran
Canada
1.46 mil
Ottawa
Country
Population
City
Norway
1.29 mil
Oslo
Nigeria
1.25 mil
Onitsha
United States
1.23 mil
Oklahoma City
Russia
1.13 mil
Omsk
Ukraine
1.09 mil
Odessa
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