World Population Day, celebrated annually on July 11th, serves to draw attention to the demographic dynamics that are transforming global societies. In 2026, the United Nations addresses this theme with a focus on 'Realizing Youth Hopes and Aspirations – Today and for the Future.'
Urban Influence on Youth
This year's campaign highlights how the choices made by young people—regarding education, employment, housing, relationships, and family life—are increasingly shaped by the cities where they live. This was determined through a global survey called Lives, Choices and Futures, which involved over 108 thousand young adults in 73 nations.
Urban Growth and Pressures
With more than half of the world's population already living in urban areas, a proportion expected to reach almost 70% by 2050, cities remain at the forefront of demographic change. This constant urban advance imposes growing challenges to infrastructure, housing, mobility systems, public space, and climate adaptation capacity.
In this context, the role of architecture, urban planning, and public policies becomes crucial for building more resilient and welcoming urban environments. Population trends also indicate where these tensions are most concentrated, providing an overview of rapidly expanding metropolitan regions.
Ranking of Most Populous Cities
According to the latest projections from the World Population Review (WPR), it is possible to see the 20 most populous cities on the planet in 2026, along with the annual population increase of each compared to the previous year.
The data presented includes various locations, such as Kinshasa, in the Democratic Republic of Congo, with an estimated population of 21,852,144 (growth of 5.13%), and Kano, in Nigeria, with 17,510,247 inhabitants (growth of 3.16%). Other listed cities are Lahore, in Pakistan, with 14,062,745 inhabitants (growth of 2.64%), and Johannesburg, in South Africa, with 12,043,175 inhabitants (growth of 2.88%).
The WPR editorial note clarifies that this ranking is based on estimates and that population figures may not be directly comparable between different urban regions due to variations in the definitions of city, metropolitan area, and urban agglomeration. For example, cities with large suburban areas, such as Tokyo or Jakarta, may rank lower in lists based on more comprehensive metropolitan delimitations.