The World’s 31 Mega-Cities

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Blue mosque and hagia sophia, Istanbul, Turkey

15. Istanbul, Turkey
>2016 population: 14,365,000
>Annual growth since 2000: 3.1%
>Pct. of Turkey’s population: 18.5%
>2030 estimated population: 16,694,000

Kolkata (Calcutta), India

14. Kolkata (Calcutta), India
>2016 population: 14,980,000
>Annual growth since 2000: 0.9%
>Pct. of India’s population: 1.2%
>2030 estimated population: 19,092,000

Buenos Aires, Argentina

13. Buenos Aires, Argentina
>2016 population: 15,334,000
>Annual growth since 2000: 1.3%
>Pct. of Argentina’s population: 36.1%
>2030 estimated population: 16,956,000

Karachi, Pakistan

12. Karachi, Pakistan
>2016 population: 17,121,000
>Annual growth since 2000: 3.3%
>Pct. of Pakistan’s population: 9.0%
>2030 estimated population: 24,838,000

Sunset over Dhaka, Bangladesh

11. Dhaka, Bangladesh
>2016 population: 18,237,000
>Annual growth since 2000: 3.6%
>Pct. of Bangladesh’s population: 11.2%
>2030 estimated population: 27,374,000