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 taken22,692
Average score63.6%
Rating4.38
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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
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5 Comments
+1
Level 74
May 17, 2016
100%
+3
Level 82
Jun 13, 2019
Could you accept 'Oklahoma' for Oklahoma City?
+3
Level ∞
Mar 25, 2024
No. That is not correct. OKC is accepted, however.
+1
Level 38
Jun 30, 2025
My birth city Omaha barley doesn’t make the cut :(
+1
Level 69
Sep 10, 2025
I thought Ogdenville would be in here. I hear it took off after they installed the monorail.