Published: 2020
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Cities are home to around half of the global population. Yet, definitions of what a city or a rural area is vary widely by country. Such differences hinder robust international comparisons and prevent accurate monitoring of the United Nation's Sustainable Development Goals (SDGs), as both are highly sensitive to the definitions of those areas. This report addresses this void and provides novel evidence on urbanisation throughout the world, using for the first time the definitions endorsed at the 2020 Statistical Commission of the United Nations. The population living in cities, high-density places of at least 50 000 inhabitants, has more than doubled over the last 40 years, going from 1.5 billion inhabitants in 1975 to 3.5 billion in 2015. It is projected to reach 5 billion and almost 55% of the world population by 2050. According to the degree of urbanisation, which classifies the entire territory into three categories - cities, towns & semi-dense areas, and rural areas - almost half the world's population (48%) live in cities, a quarter live in rural areas (24%) and the remainder live in towns & semi-dense areas (28%). By defining three types of areas, the Degree of Urbanisation captures the continuum between cities and rural areas and provides a more nuanced perspective than the traditional urban-rural dichotomy. The report additionally uses a definition of metropolitan areas (aka functional urban areas), which consider cities together with their surrounding commuting zones to capture the full extent of a city's labour market. Metropolitan areas account for 54% of total world population, with commuting zones representing 17% of the overall metropolitan population, a share that rises to 31% in high-income countries In using these two global definitions, this report presents a new perspective on urbanisation: it assesses quality of life along the urban-rural continuum; it examines the links between economic development and metropolitan areas; it describes the demographic growth (and decline) of metropolitan areas; and it shows how cities are both expanding and densifying, and how this affects sustainable development. Finally, the report demonstrates that towns & semi-dense areas have distinct socio-economic properties, falling between those of a city and a rural area in numerous ways.