Biggest World Cities Ending in O

Guess the 20 biggest agglomerations that end in the letter O.
According to citypopulation.de
Use the common English names! (So no Ciudad de México or Milano)
Inspired by joez' quiz
Quiz by Gassu
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Last updated: October 12, 2017
First submittedOctober 12, 2017
Times taken95
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Population
City
39.8 mil
Tokyo
21.9 mil
São Paulo
17.1 mil
Cairo
12.7 mil
Rio de Janeiro
9.8 mil
Chicago
7.7 mil
San Francisco
7.2 mil
Toronto
7.2 mil
Santiago
5.9 mil
Qingdao
4.7 mil
Colombo
Population
City
4.3 mil
Kano
3.8 mil
Santo Domingo
3.4 mil
Ningbo
3.4 mil
Zibo
3.3 mil
San Diego
3.2 mil
Orlando
3.0 mil
Bamako
2.6 mil
Quito
2.5 mil
Maracaibo
2.5 mil
Sapporo
+1
Level 80
Oct 13, 2017
Argh - total brain fade. Why is that so difficult?