When we say largest cities in the World we are referring strictly to population. On the first three places we have the following cities: Shanghai (China) with 23,416,000 people, Karachi (Pakistan) with 25,400,000 people and Beijing (China) with 21,009,000 people. Below we have the list with the most populated cities in the world.
São Paulo (Brazil) - 20,365,000
Dhaka (Bangladesh) - 15,669,000
New Delhi (India) - 24,998,000
Lagos (Nigeria) - 13,123,000
Istanbul (Turkey) - 15,328,000
Tokyo (Japan) - 37,843,000
Mumbai (India) - 17,712,000
Moscow (Russia) - 16,170,000
Guangzhou (China) - 20,597,000
Paris (France) - 12,005,077
Shenzhen (China) - 12,084,000
Suzhou (China) - 10,650,501
Kinshasa (Congo) - 13,265,000
Cairo (Egypt) - 18,290,000
Jakarta (Indonesia) - 30,539,000
Lahore (Pakistan) - 10,355,000
Seoul (South Korea) - 12,700,000
Mexico City (Mexico) - 20,063,000
London (United Kingdom) - 10,236,000
Lima (Peru) - 10,750,000
New York City (United States) - 20,630,000
Bengaluru (India) - 9,807,000
Bangkok (Thailand) - 14,998,000
Dongguan (China) - 8,220,207
Chongqing (China) - 8,189,800
Nanjing (China) - 8,187,828
Tehran (Iran) - 13,532,000
Shenyang (China) - 8,106,171
Bogotá (Colombia) - 8,854,722
Ho Chi Minh City (Vietnam) - 7,681,700
Hong Kong (Hong Kong) - 7,298,600
Baghdad (Iraq) - 7,180,889
Chennai (India) - 7,088,000
Changsha (China) - 7,044,118
Wuhan (China) - 6,886,253
Tianjin (China) - 10,920,000
Hyderabad (India) - 6,809,970
Hanoi (Vietnam) - 6,844,100
Faisalabad (Pakistan) - 6,480,765
Rio de Janeiro (Brazil) - 12,727,000
Foshan (China) - 6,151,622
Zunyi (China) - 6,127,009
Santiago (Chile) - 5,743,719
Riyadh (Saudi Arabia) - 5,676,621
Ahmedabad (India) - 5,570,585
Singapore (Singapore) - 5,535,000
Shantou (China) - 5,391,028
Yangon (Myanmar) - 5,214,000
Saint Petersburg (Russia) - 5,191,690
Abidjan (Ivory Coast) - 4,765,000
Chengdu (China) - 10,376,000
Alexandria (Egypt) - 4,616,625
Kolkata (India) - 4,486,679
Ankara (Turkey) - 4,585,000
Surat (India) - 4,462,002
Johannesburg (South Africa) - 4,434,827
Dar es Salaam (Tanzania) - 4,364,541
Harbin (China) - 4,280,701
Giza (Egypt) - 15,600,000
Zhengzhou (China) - 4,122,087
New Taipei City (Taiwan) - 3,954,929
Los Angeles (United States) - 15,058,000
Cape Town (South Africa) - 3,740,026
Yokohama (Japan) - 3,726,167
Hangzhou (China) - 3,560,391
Xiamen (China) - 3,531,347
Quanzhou (China) - 3,520,846
Berlin (Germany) - 3,517,424
Busan (South Korea) - 3,510,833
Rawalpindi (Pakistan) - 3,510,000
Jeddah (Saudi Arabia) - 3,456,259
Durban (South Africa) - 3,442,361
Hyderabad (Pakistan) - 3,429,471
Kabul (Afganistan) - 3,414,100
Casablanca (Morocco) - 3,359,818
Hefei (China) - 3,352,076
Pyongyang (North Korea) - 3,255,388
Madrid (Spain) - 3,207,247
Peshawar (Pakistan) - 3,201,000
Ekurhuleni (South Africa) - 3,178,470
Nairobi (Kenya) - 3,138,369
Zhongshan (China) - 3,121,275
Pune (India) - 3,115,431
Addis Ababa (Ethiopia) - 3,103,67
Jaipur (India) - 3,073,350
Buenos Aires (Argentina) - 3,054,300
Lucknow (India) - 3,001,475
Wenzhou (China) - 3,039,439
Osaka (Japan) - 17,444,000
Kyiv (Ukraine) - 2,908,703
Manila (Philippines) - 12,877,253
Izmir (Turkey) - 4,168,000
Chicago (United States) - 9,156,000
Nagoya (Japan) - 10,177,000
Taipei (Taiwan) - 2,704,974
Luanda (Angola) - 2,825,311
Houston (United States) - 2,296,224
Kochi (India) - 4.221,140
Kuala Lumpur (Malaysia) - 1,768,000
Phnom Penh (Cambodia) - 2,234,566