10 Biggest Cities in the World

Below are the ten biggest cities in the world according to citypopulation.de, the United Nations and according to their official city proper population.
Quiz by relessness
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Last updated: May 10, 2016
First submittedMay 10, 2016
Times taken100
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citypopulation.de
49.6 mil
Guangzhou
39.5 mil
Tokyo
30.4 mil
Shanghai
27.7 mil
Jakarta
26.0 mil
Delhi
24.3 mil
Seoul
24.0 mil
Karachi
23.1 mil
Manila
23.0 mil
Mumbai
22.5 mil
Mexico City
United Nations
37.8 mil
Tokyo
25.0 mil
Delhi
23.0 mil
Shanghai
20.8 mil
Mexico City
20.8 mil
São Paulo
20.7 mil
Mumbai
20.1 mil
Osaka
19.5 mil
Beijing
18.6 mil
New York City
18.4 mil
Cairo
City Proper
24.3 mil
Shanghai
21.5 mil
Beijing
21.3 mil
São Paulo
21.0 mil
Karachi
16.8 mil
Delhi
16.1 mil
Lagos
14.4 mil
Istanbul
13.3 mil
Tokyo
12.5 mil
Mumbai
12.2 mil
Moscow
+1
Level 65
May 10, 2016
What is your source for citypopulation.de? Seems a bit off, compared to http://www.citypopulation.de/world/Agglomerations.html