Tokyo is now the largest city on the planet with 37 million inhabitants, followed by New Delhi with 29 million, Shanghai with 26 million and Sao Paulo and Mexico City with 22 million apiece. Together, India, China and Nigeria will account for 35% of the projected growth of the world's urban population between 2018 and 2050.
"The increasing concentration of people in cities provides a way of more economically providing services". Globally, fewer cities are projected to see their populations decline from today until 2030, compared to what has occurred during the last two decades.
Sixty-eight percent of the world's population will live in urban areas by the year 2050, the United Nations has said, up from 55% at present.
North America now has the most urbanized regions (with 82 per cent of its population living in urban areas in 2018), while the corresponding figure for Latin America and the Caribbean is 81 per cent, followed by Europe (74 per cent) and Oceania (68 per cent).
The report also estimates that by 2030, the world could have 43 so-called megacities (up from 31 today, according to reports) - those with more than 10 million inhabitants - a lot of them in developing countries. The level of urbanization in Asia is now approximating 50%.
Tokyo with 37 million people is the world's largest city but this is because that can be overtaken by Delhi around 2028, the report stated.
A few cities in Japan and the Republic of Korea (for example, Nagasaki and Busan) have experienced population decline between 2000 and 2018.
Among other findings, the report said in 1990 there were just ten megacities with populations of 10 million or more.
The chairman of NPC, Eze Duruiheoma, stated this in NY while delivering Nigeria's statement on sustainable cities, human mobility and global migration at the 51st session of commission on population and development. Africa and Asia are home to almost 90 percent of the world's rural population in 2018.
In 32 years, India will be among the countries with highest growth in world's urban population, according to the United Nations.
The report added that linkages between urban and rural areas would need to be strengthened, building on their existing economic, social and environmental ties.
Population Division director John Wilmoth said: "When urban growth is rapid, insuring access to housing, water, sanitation, electricity, public transport, education and health care for all is especially challenging".
UN DESA's Population Division is has been issuing reports on urbanization since 1988.