World's Most Populous Urban Agglomerations: RankNameEst. population 1.Tokyo, Japan36,932,780 2.Delhi, India21,935,142 3.Mexico City, Mexico20,142,334 4.New York, United States of America20,104,369 5.Sao Paulo, Brazil19,649,366 6.Shanghai, China19,554,059 7.Bombay, India19,421,983 8.Beijing, China14,999,554 9.Dacca, Bangladesh14,929,647 10.Calcutta, India14,283,096 11.Karachi, Pakistan13,499,702 12.Buenos Aires, Argentina13,369,921 13.Los Angeles, United States of America13,223,023 14.Rio de Janeiro, Brazil11,867,236 15.Manila, Philippines11,653,810 16.Moscow, Russia11,471,637 17.Osaka, Japan11,429,912 18.Cairo, Egypt11,031,494 19.Istanbul, Turkey10,952,950 20.Lagos, Nigeria10,788,300 21.Paris, France10,516,374 22.Guangzhou, China10,485,570 23.Shenzhen, China10,222,493 24.Seoul, South Korea9,750,693 25.Chongqing, China9,732,286 26.Jakarta, Indonesia9,629,953 27.Chicago, United States of America9,544,691 28.Lima, Peru8,950,481 29.London, Great Britain8,923,000 30.Wuhan, China8,903,018 NOTES: The definition of agglomerations varies significantly from city to city, hence the difficulty of compiling an accurate, comparative list of the world's most populous urban areas. 1. Includes metropolitan areas and surrounding urban agglomerations. Agglomerations include a central city and bordering urban areas. Some agglomerations have more than one central city (e.g., Tokyo includes Yokohama and Kawasaki).