The first known city was built by the Sumerians 6000 years ago in the territory that is now Iraq. By 2002 48% of people living in the world lived in urban areas. Many people in every territory live in urban areas.
Areas of dense population facilitate trade and the provision of services. Just two territories have 100% of the population living in urban areas - these are Singapore and Hong Kong (China).
In Brazil 145 million people, that is 82% of the population, live in towns and cities. In Bhutan 180 thousand, 8% of the population, live in urban areas.