The rapid expansion of cities and suburbs, is becoming one of the defining demographic and economic transformations of the 21st century, creating new opportunities for employment, public services and social mobility, placing growing demands on governments to manage housing, infrastructure and environmental pressures.
The change is particularly evident in the rise of megacities, urban clusters with more than 10 million inhabitants. Their share of the world’s urban population, increased from just 2.5% in 1950 to 16.4% in 2020. United Nations projections indicate that the proportion will remain approximately stable through mid-century, even as the absolute populations of many metropolitan areas continue to expand.
At the same time, the relative share of urban residents living in smaller cities of between 50,000 and 500,000 people, declined from 50.8% to 38.6% between 1950 and 2020. The trend replicates the continuing movement of people towards metropolitan areas where jobs, education, healthcare, transport networks and other public services are more concentrated. Urban growth has become a domestic development priority.
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