Every year, World Population Day is observed on July 11th, aiming to increase people's awareness of various population issues, such as the importance of urbanization, genderequality, poverty, health, and human rights. In 2025, under the theme "Empowering Youth to Build the Families They Want," the United Nations draws attention to the largest generation of young people in history, many of whom are coming of age in rapidly urbanizing contexts. Urban centers remain key to understanding these demographic patterns, as cities continue to attract populations seeking opportunity, stability, and access to essential services. Today, more than half of the global population resides in urban areas, a share projected to increase to 66% by 2050.
The Economist Intelligence Unit (EIU) has released its Global Liveability Index for 2025, assessing 173 cities worldwide across five categories: stability, healthcare, culture and environment, education, and infrastructure. This year, Copenhagen has taken the top position, ending Vienna's three-year run as the world's most liveable city. The Danish capital earned high scores in stability, education, and infrastructure, narrowly surpassing Vienna, which saw a decline in its stability rating following recent security incidents. The average global liveability score for 2025 remains steady at 76.1 out of 100, unchanged from 2024. While year-on-year improvements were recorded in healthcare, education, and infrastructure, these were offset by a continued decline in stability, driven by rising geopolitical tensions, civil unrest, and increased security threats in several regions.
More than half of the world's population resides in urban areas, with over 4 billion people depending on cities as their main environment. According to the United Nations’ latest report on populations in cities, this number is expected to continue to increase over the next 50 years, prompting cities worldwide to strive to find better ways to accommodate their growing population while transitioning to more sustainable urban practices. To highlight this responsibility, the United Nations has declared July 11th the World Population Day.
Under this year’s theme, “To Leave No One Behind, Count Everyone,” the UN aims to also draw attention to the importance of data collection for reflecting societal diversity. The growth of world cities is part of this equation as an important measure for understanding global population trends. The following list presents the top 20 cities worldwide in 2024, ranked by the population size of their metropolitan areas. Comparing the results to the previous editions, the only cities to reduce their size are the two cities from Japan, Tokyo and Osaka. The highest growth rates can be observed in African mega-cities, Kinshasa and Lagos, while China continues to be the most present country in the list, with 5 metropolises present in the top 20: Shanghai, Beijing, Chongqing, Tianjin, and Guangzhou.
Construction on OMA’s first project in Bangladesh, the Dhaka Tower, has just started. Reaching a height of 150 meters and spanning 180,000 sqm in office space, the project is set to stand as one of the tallest buildings in the country. This scheme marks a significant milestone in the urban landscape of Bangladesh, designed by OMA in collaboration with local real-estate developer Shanta Holdings.
Half of the world’s population now lives in cities, according to UN-Habitat’s latest reports. While this number is set to increase to two-thirds by 2050, urban challenges are growing exponentially, making it more crucial than ever, to transform our cities. Annually, the world population review assesses the growth of cities and the number of residents living in metropolitan areas, to understand global evolution trends. In 2022, the list of the top 20 most populated countries remained similar to the 2021 edition, with a slight change in numbers and positions. Tokyo kept its status as the world’s largest city, with 37 million inhabitants, while Delhi and Shanghai, followed in second and third positions.
Comparing the results to the 2021 edition, the only decrease that can be seen in the top 20, involves both Japanese cities, Tokyo and Osaka. The rest of the list had, on average, a growth of 1.8% in the total of people residing in metropolitan areas. In fact, African cities Kinshasa in the Democratic Republic of Congo and Lagos in Nigeria gathered the highest rates, with respectively a 4.39% and a 3.54% increase in residents in 1 year. The largest city in the American continent is still Sao Paulo in Brazil, followed closely by Mexico City and Buenos Aires in Argentina, further down the table. In Europe, Istanbul is the most populous, with more than 14.5 million residents.
As is obvious to anyone with even a passing interest in demographics, cities are becoming denser—much denser. Rural life continues its steady emptying-out as urban life accelerates its explosive filling-in. The tilt has been apparent at least since the middle of the last century when the French geographer Jean Gottmann invented the word “megalopolis” to describe the continuous urbanization from Boston to Washington, D.C., then containing one-fifth of the United States’ population. But nowhere has the shift from countryside to city been more dramatic than in present-day Asia.
