Biggest World Cities That End in O

Name the most populous urban areas that end with the letter O.
According to citypopulation.de, for the year January 2020
Color-coded by continent
Not including cities that end with "City" like "Mexico City"
Quiz by Aaron197
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Last updated: July 25, 2020
First submittedJuly 25, 2020
Times taken165
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Population
City
40.2 mil
Tokyo
22.4 mil
São Paulo
21.1 mil
Cairo
13.2 mil
Rio de Janeiro
9.75 mil
Chicago
7.85 mil
San Francisco
7.45 mil
Toronto
7.25 mil
Santiago
6.10 mil
Qingdao
4.75 mil
Colombo
Population
City
4.70 mil
Kano
4.00 mil
Santo Domingo
3.52 mil
Bamako
3.52 mil
Zibo
3.45 mil
Orlando
3.35 mil
San Diego
3.27 mil
Ningbo
2.72 mil
Quito
2.62 mil
Maracaibo
2.50 mil
Sapporo
Population
City
2.27 mil
Maputo
2.22 mil
San Antonio
2.07 mil
Sacramento
1.91 mil
Aleppo
1.86 mil
Montevideo
1.57 mil
Davao
1.54 mil
Porto
1.47 mil
Jiaozuo
1.44 mil
Queretaro
1.39 mil
Dnipro
+2
Level 73
Jul 25, 2020
Sao Paulo ?
+1
Level 67
Jul 25, 2020
Great quiz, much harder than I had anticipated! Also, one of the caveats says "color-ceded" instead of "color-coded," just a heads up ;)