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Biggest World Cities by Letter - I

In the entire world there are six urban areas starting with the letter I that have a population over 1,500,000. Can you name them?
Urban area population, not city proper
According to citypopulation.de, January 2019
Last updated: February 13, 2019
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Keep scrolling down for answers and more stats ...
Country
Population
City
Turkey
15.8 mil
Istanbul
Nigeria
3.48 mil
Ibadan
Pakistan
3.35 mil
(Rawalpindi / Islamabad)
Iran
3.15 mil
Isfahan
India
3.08 mil
Indore
Turkey
3.03 mil
Izmir
United States
1.98 mil
Indianapolis
+1
level 55
May 9, 2014
Short list.
+1
level 68
Jul 13, 2015
Illoilo City in the Philippines?
+1
level 49
Nov 20, 2016
How did more people get Ibadan than Indore?
+1
level 49
Sep 9, 2018
because Indore is behind a lot of most indian populated city whereas Ibadan is top 5 in Nigeria