Five Biggest Cities in Random Organisations

Can you name the five biggest cities, which are part of the given international organisation.
The answers change every time.
If you don't know the organisation yet, press on the name, it is a link to the wikipedia article.
By urban area. Main source: Wikipedia - List of largest cities third column (Demographia)
Quiz by Nathaniel
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Last updated: May 29, 2020
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First submittedMay 29, 2020
Times taken81
Average score80.0%
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11,400,000
Paris
6,550,000
Madrid
6,200,000
Milan
5,700,000
Ruhr Area
5,000,000
Cologne
 
 
16,925,000
Cairo
7,315,000
Baghdad
6,050,000
Riyadh
5,685,000
Khartoum
5,086,000
Alexandria
21,090,792
São Paulo
13,693,657
Buenos Aires
13,131,431
Rio de Janeiro
9,904,727
Lima
9,286,225
Bogotá
 
 
34,365,000
Jakarta
18,595,000
Dhaka
16,925,000
Cairo
16,900,000
Karachi
14,630,000
Lagos
28,125,000
Delhi
23,645,000
Mumbai
18,595,000
Dhaka
16,900,000
Karachi
15,215,000
Kolkata
 
 
2,620,000
Rotterdam
2,500,000
Brussels
2,431,000
Amsterdam
1,200,000
Antwerp
1,054,793
The Hague
+1
Level 60
May 29, 2020
Cool Quiz
+1
Level 74
May 29, 2020
thx
+1
Level 43
Jun 22, 2022
For the Benelux one, if the Hague is included, then Rotterdam should only have 1.6 million