City	Pop. 2011	Pop. Est. 2025	Growth Rate	Avg. Annual Growth
1	Lagos, Nigeria	11.2 million	18.9 million	68%	3.71%
2	Dhaka, Bangladesh	15.4 million	22.9 million	49%	2.84
3	Shenzhen, China	10.6 million	15.5 million	46	2.71
4	Karachi, Pakistan	13.9 million	20.2 million	45	2.68
5	Delhi, India	22.7 million	32.9 million	44	2.67
6	Beijing, China	15.6 million	22.6 million	44	2.66
7	Guangzhou, China	10.8 million	15.5 million	43	2.54
8	Shanghai, China	20.2 million	28.4 million	40	2.43
9	Manila, Philippines	11.9 million	16.3 million	37	2.26
10	Mumbai, India	19.7 million	26.6 million	35	2.12
11	Istanbul, Turkey	11.3 million	14.9 million	32	2
12	Cairo, Egypt	11.2 million	14.7 million	31	1.98

Source:  https://www.allianz.com/en/about_us/open-knowledge/topics/demography/articles/130103-twelve-fastest-growing-megacities.html/