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Biggest World Cities by Letter - 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 2019
Quiz by geoPunk
Rate:
First submittedFebruary 13, 2012
Last updatedFebruary 13, 2019
Times taken4,597
Rating3.79
3:00
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Country
Population
City
Japan
17.7 mil
Osaka
United States
3.38 mil
Orlando
Burkina Faso
2.53 mil
Ouagadougou
Japan
2.20 mil
Okayama
Algeria
1.45 mil
Oran
Canada
1.23 mil
Ottawa
Country
Population
City
Ukraine
1.19 mil
Odessa
Norway
1.18 mil
Oslo
Russia
1.17 mil
Omsk
Nigeria
1.17 mil
Onitsha
United States
1.14 mil
Oklahoma City
+1
level 57
May 17, 2016
100%
+1
level 56
Jun 13, 2019
Could you accept 'Oklahoma' for Oklahoma City?