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Most Populous 2nd Cities

We made a list of the urban areas that are only the second most populous in their country. Among those, which ones have the largest population?
By urban area population, not city proper
According to citypopulation.de, January 2020
Not counting the "loosely-defined" areas of Germany
Quiz by relessness
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Last updated: April 14, 2020
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First submittedOctober 14, 2014
Times taken33,850
Average score50.0%
Rating4.42
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Population
Continent
City
33.6 m
Asia
Shanghai
25.1 m
Asia
Mumbai
17.7 m
Americas
Los Angeles
17.7 m
Asia
Osaka
13.2 m
Americas
Rio de Janeiro
13.0 m
Asia
Lahore
7.0 m
Asia
Bandung
5.8 m
Africa
Alexandria
5.7 m
Europe
Saint Petersburg
5.4 m
Americas
Guadalajara
Population
Continent
City
5.1 m
Asia
Ankara
5.0 m
Asia
Jeddah
5.0 m
Oceania
Melbourne
4.9 m
Asia
Chittagong
4.8 m
Europe
Barcelona
4.7 m
Africa
Kano
4.3 m
Europe
Naples
4.3 m
Africa
Cape Town
4.2 m
Asia
Busan
4.2 m
Americas
Montreal
+9
Level 89
Oct 14, 2014
Nice quiz. I'm amazed I got as many as I did.
+2
Level 83
Oct 14, 2014
I'm amazed 56% got Jeddah. I was expecting to be the first one.
+4
Level 85
Oct 18, 2014
Be happy, it's now down to 26%. I got that one but miserably missed Barcelona...
+1
Level 75
Nov 28, 2014
Now 12%. I only got it because years ago a friend lived there.
+4
Level 83
Nov 29, 2014
and now 9%. I must have taken this the first time when it was a new quiz and only the hardcore quiz geeks had gotten around to taking it.
+1
Level 75
Jun 15, 2016
I was there when I turned 2 years old
+1
Level 46
Feb 27, 2021
Now it is at 17%
+2
Level 64
Sep 5, 2016
I was surprised at the 10% for Chtitagong
+2
Level 68
Apr 18, 2018
I was surprised Kano 7%!
+1
Level 80
Sep 12, 2019
Chittagong is now officially known as Chattogram. But Chittagong will be in use for a while yet
+7
Level 75
May 26, 2020
Chattogram sounds like a weird type of anagram
+8
Level 80
May 26, 2020
or more like a snapchat / instagram hybrid
+9
Level 75
Oct 17, 2014
Another nice quiz! Hanoi? 6 million when I was there last year, although citypopulation.de says only 2.9 mil, which must be some admin boundary that doesn't take the contiguous urban area into account.
+2
Level 85
Oct 18, 2014
Yes, I thought it would be on the list. I also thought of Mashhad but it seems to be a bit short... the numbers on wikipedia are absurd though, giving a city population inferior to the metro population.
+1
Level 52
Nov 28, 2014
The city population has to be lower than the metro population
+1
Level 66
Jun 6, 2017
Indubitably.
+1
Level 88
Jun 26, 2018
Wikipedia is a joke when it comes to statistics. Any buffoon can edit it and, notably, population densities are calculated atrociously. The figures are often given per square kilometer when glaringly having been divided by square mile or worse divided twice by the 2.56 factor that differentiates the two. The site is a laughfest for accuracy. Go to a real government source.
+1
Level 44
Nov 28, 2014
Excellent quiz.
+2
Level 49
Nov 28, 2014
Would be nice to have the country as a hint/clue
+12
Level 56
Nov 28, 2014
Please no, it's better without the countries given. We don't want it to be too easy, now do we?
+9
Level 47
Nov 28, 2014
I agree, otherwise it would just be a quiz on naming the second biggest cities.
+1
Level 70
Nov 28, 2014
I thought Berlin would be in the list because according to Citypopulation it's the second biggest urban area of Germany, with 4.35 million inhabitants.

Please also allow the spelling Jidda(h).

+3
Level 58
Dec 4, 2014
When I check, citypopulation gives Berlin as the largest with 'only' 3.4 million.
+2
Level 65
Apr 5, 2017
That's city proper though. The largest urban area in Germany is the Rhine-Ruhr area.
+2
Level 63
Aug 30, 2017
If you ask me Hamburg should be on the list. It has the second largest urban area when looking at a single big city + its urban area and not a few major ones in a combined urban area like Duisburg/Essen/Bochum/Dortmund (Ruhr) or Cologne/Düsseldorf. No German will ever say that Berlin is not the biggest city. Then again I'm sure some of the other cities urban Areas include other major cities but don't get to be mentioned.
+4
Level 66
Nov 28, 2014
I thought that Milan was the second city in Italy.
+2
Level 67
Jan 3, 2015
Infact, Milan is 7,4 metro and 5,3 urban population which makes it the largest in Italy.
+3
Level 47
Jan 3, 2015
Yeah, Rome's actually third according to metropolitan populations.
+1
Level 28
Nov 28, 2014
Had to think hard about this one. got 13 in the end.
+1
Level 21
Nov 29, 2014
This was really more a spelling test.
+1
Level 66
Jun 6, 2017
Really? Ummm... Canoe? Never mind, you know nothing.
+1
Level 76
May 25, 2020
And I can spell non sequitur.
+1
Level 65
Jan 22, 2016
Where is Bandung?

Oh well...I guess I'll try again.

+5
Level 32
Feb 17, 2016
Indonesia
+3
Level 89
Apr 5, 2017
Really surprised that Medellin hasn't made it's way unto the list. But It's just at 3.9 million. I would have guessed higher.
+1
Level 55
Apr 5, 2017
nice quiz!
+4
Level 40
Dec 26, 2019
naples isn't the second biggest city of Italy...
+1
Level 60
Oct 26, 2023
It is...
+2
Level 83
Feb 11, 2020
Got 'em all, but it took me a while to get Montreal, because my head was stuck in South America.
+1
Level 65
Feb 20, 2020
This was tough. Maybe itwould have helped if I did biggest cities first.
+1
Level 47
May 22, 2020
What does "loosely-defined" areas of Germany exactly mean?
+3
Level 60
May 25, 2020
The Ruhr area, Cologne/Dusseldorf. Just some suggestions.
+1
Level 43
May 25, 2020
Alright, no loosely-defined regions in Germany. Fine. But even then the very definite Hamburg metropole (5.3 mio) as a second place after Berlin (6.1 mio) should make the cut.
+1
Level 60
May 25, 2020
Got 20/20. Thought of Jeddah literally at the last second of the quiz. Didn't think it was that big.
+5
Level 62
May 25, 2020
What about Hanoi? This city has 8 million people in it as of 2019 https://www.citypopulation.de/en/vietnam/cities/?admid=8225,
+5
Level 67
May 25, 2020
Yeah, Hanoi should definitely be here. Even using conservative methods, it's more populous than all the cities in the right column.
+1
Level 75
Oct 19, 2020
Probably this quiz hasnt updated yet
+1
Level 37
May 25, 2020
I thought Shanghai is the most populous in China and not the second.
+4
Level 61
May 25, 2020
Guangzhou is the most populous by urban area.
+3
Level 68
May 26, 2020
I think Surabaya is larger than Bandung.

http://citypopulation.de/Indonesia-CU.html

+3
Level 84
Aug 16, 2020
Hanoi has a population of around 8 million, easily making the list.
+2
Level 75
Oct 19, 2020
As an Indonesian I thought Surabaya would make it on the list. And I got a second left before Jeddah already gotten into the list. Got me thinking hard for that one
+2
Level 63
Mar 28, 2021
Where is Hanoi? It has an urban population of around 8 million
+2
Level 44
Feb 13, 2022
Surabaya and Hanoi should be here, please do a minimum of research for your quizzes.
+2
Level 48
Jun 8, 2022
Hanoi 6.4 Mio is missing
+1
Level 57
Feb 16, 2023
18/20 I missed Guadalajara & Busan. Blast!
+1
Level 64
Dec 4, 2023
Think Hanoi should be there... urban population of 8mil.

Bandung (8.9mil urban) isn't the second largest city in Indonesia, it's Surabaya (9.5mil urban). I say check your sources, but maybe it's because it was last updated in 2020