Metropolitan Populations

Bangkok, Thailand - 7,221,000
Beijing, China - 12,033,000
Bogotá, Colombia - 6,834,000
Buenos Aires, Argentina - 12,431,000
Cairo, Egypt - 10,772,000
Calcutta, India - 12,900,000
Chicago, USA - 6,945,000
Delhi, India - 11,680,000
Dhaka, Bangladesh - 10,979,000
Istanbul, Turkey - 9,413,000
Jakarta, Indonesia - 9,815,000
Karachi, Pakistan - 11,774,000
Lagos, Nigeria - 13,488,000
Lima, Peru - 7,443,000
London, UK - 7,640,000
Los Angeles, USA - 13,129,000
Manila, Philippines - 10,818,000
Mexico City, Mexico - 18,131,000
Moscow, Russian Fed. - 9,299,000
Mumbai, India - 18,042,000
New York City, USA - 16,626,000
Õsaka, Japan - 10,609,000
Paris, France - 9,638,000
Rio de Janeiro, Brazil - 10,556,000
Sáo Paulo, Brazil - 17, 711,000
Seóul, South Korea - 12,215,000
Shanghai, China - 14,173,000
Tehrãn, Iran - 7,380,000
Tianjin, China - 10,239,000
Tokyo, Japan - 28,025,000

(From Worldatlas. Wikipedia pages: metropolitan areas, cities proper, urban areas, urban agglomerations, LUZ, comparative table).