Biggest Cities Starting with O

In the entire world there are eleven urban areas starting with the letter O that have a population over 1,000,000. How many can you name?
Urban area population, not city proper
According to citypopulation.de, January 2024
Quiz by GeoPunk
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Last updated: March 25, 2024
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First submittedFebruary 13, 2012
Times taken12,996
Average score63.6%
Rating4.19
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Country
Population
City
Japan
17.7 mil
Osaka
United States
3.80 mil
Orlando
Burkina Faso
3.30 mil
Ouagadougou
Japan
2.18 mil
Okayama
Algeria
1.60 mil
Oran
Canada
1.33 mil
Ottawa
Norway
1.26 mil
Oslo
United States
1.20 mil
Oklahoma City
Nigeria
1.20 mil
Onitsha
Russia
1.16 mil
Omsk
Ukraine
1.10 mil
Odessa
+1
Level 70
May 17, 2016
100%
+3
Level 79
Jun 13, 2019
Could you accept 'Oklahoma' for Oklahoma City?
+1
Level ∞
Mar 25, 2024
No. That is not correct. OKC is accepted, however.