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The world's biggest city: past, present and future

Can you name these cities which have had (or are forecast to have) a valid claim to be the world's largest, measured by population?
Data mostly from Wikipedia; predictions from Ontario Tech University, plus the 2028 one from the World Economic Forum
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XYU
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Last updated: June 9, 2025
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First submittedJune 9, 2025
Times taken13
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Clue
City
The biggest city by urban area population, and by metropolitan area population
Tokyo
The biggest city (by most measures) in the largest metropolis
Guangzhou
The biggest (by urban area population) in the largest metropolis
Shenzhen
The biggest by city proper (ie, the local government district) when non-connected towns are removed from the count
Shanghai
Predicted to be the biggest city by 2028
Delhi
Forecast to become the most populous metropolitan area by 2030
Jakarta
Predicted to be the biggest city by 2050
Mumbai
Predicted to be the biggest city by 2075
Kinshasa
Predicted to be the biggest city by 2100
Lagos
The biggest, according to estimates, from around: 500 BC
Babylon
200 BC
Alexandria
1st century AD
Rome
6th century
Constantinople
7th century
Daxing
(Chang'an)
12th century
Baghdad
14th century
Hangzhou
15th century
Jinling
(Nanjing)
16th century
Beijing
1830s
London
1920s-60s
New York
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