fast-facts_1 For the first time in history, more than half of the world’s people live in cities.


Nearly 2,000,000,000 new urban residents are expected in the next 20 years.

fast-facts_2 of global GDP is created by cities.
fast-facts_3 The proportion of the urban population in developing countries living in slums.


The number of slum dwellers is estimated to grow by nearly 500,000,000 by 2020.

Three largest cities in the world ranked by population

Tokyo, Japan
New York City, USA
 São Paulo, Brazil


Sources:, UN-HABITAT State of the World’s Cities Report 2010/2011, The World Bank’s World Development Report 2009.