Largest City in the World — Statistics & Facts 2026

The Largest City in the World 2026: Jakarta Overtakes Tokyo With 42 Million People

The question "what is the largest city in the world?" depends on how you define a city. By metropolitan area population (using the UN's updated Degree of Urbanization methodology from WUP 2025), Jakarta leads at approximately 42 million. By city proper (administrative boundaries), Chongqing, China claims 32 million within its vast municipal borders, though its urban core is much smaller.

Tokyo held the top position from the 1960s until the UN's 2025 revision reclassified city boundaries using satellite-based urban footprint mapping. Under the new methodology, Jakarta's sprawling Jabodetabek metro area (Jakarta, Bogor, Depok, Tangerang, Bekasi) was measured at 42 million, while Tokyo's population of 33.4 million reflects decades of Japan's demographic decline through a combination of natural growth and rural-urban migration.

The urban landscape is shifting dramatically. In 1950, only New York and Tokyo qualified as megacities. By 2025, there are 33 megacities worldwide, with 19 in Asia. The number has quadrupled from 8 in 1975. By 2050, the UN projects 37 megacities, with most new additions from Africa and South Asia.

Global urbanization has reshaped human civilization. Approximately 4.6 billion people (57%) now live in cities, up from 750 million (30%) in 1950. The world adds approximately 1.5 million new urban residents per week. By 2050, 68% of humanity will be urban. This massive urban migration is the backdrop for global trends explored in analysis of the 8.12 billion world population.

Cities are economic powerhouses. The world's top 300 metropolitan economies generate approximately 60% of global GDP while housing only 20% of the world's population. Tokyo's metro GDP exceeds $1.9 trillion (larger than the GDP of most countries). New York ($1.8T), Los Angeles ($1.0T), Shanghai ($0.9T), and London ($0.85T) follow. The corporations headquartered in these cities shape the global economy, as explored in analysis of the world's most valuable companies by market capitalization.

Jakarta, Indonesia is now the world's largest city with approximately 42 million people (UN WUP 2025), overtaking Tokyo which held the title since the 1960s. The Jabodetabek metropolitan area is rapidly expanding but faces severe challenges including flooding, subsidence, congestion, and inequality.

Number of Megacities Worldwide — 1950 to 2030

The bar chart tracks the number of megacities (metro areas exceeding 10 million) from 1950 to 2026 with projections to 2030. The explosion from 2 megacities (1950) to 35 (2026) illustrates the unprecedented pace of global urbanization.

Asia dominates: 22 of 35 megacities are Asian (Tokyo, Delhi, Shanghai, Beijing, Mumbai, Osaka, Dhaka, Karachi, Kolkata, Chengdu, Guangzhou, Shenzhen, Tianjin, Wuhan, Jakarta, Seoul, Manila, Bangkok, Hyderabad, Chennai, Lahore, Hangzhou). Latin America has 6 (São Paulo, Mexico City, Buenos Aires, Lima, Bogotá, Rio de Janeiro). Africa has 3 (Cairo, Lagos, Kinshasa). By 2030, an additional 8 cities will cross the 10 million threshold.

World's 20 Largest Cities by Metropolitan Population — 2026

Population Growth of Top 5 Megacities — 1990 to 2030

The line chart tracks population growth for the five largest megacities from 1990 to 2026 with projections to 2030. Delhi's steep upward trajectory contrasts sharply with Tokyo's plateau and decline, illustrating the demographic crossover underway.

Top 10 Largest Cities in the World — 2026 Visual Rankings

World's 10 Largest Metropolitan Areas by Population

Tokyo: The World's Largest City for Six Decades

Tokyo has been the world's largest metropolitan area since the early 1960s, when its population surpassed that of New York. The Greater Tokyo Area (including Tokyo, Kanagawa, Saitama, and Chiba prefectures) covers approximately 13,500 km² and generates approximately $1.9 trillion in annual GDP, an economy larger than Italy or Canada.

Tokyo's population peaked at approximately 37.4 million in 2020 and has since begun declining, reflecting Japan's severe demographic crisis (TFR of 1.2, population declining by 800,000+ per year). The Tokyo metropolitan government projects the metro population will decline to approximately 35 million by 2040 and 33 million by 2050.

Despite population decline, Tokyo remains the world's most economically productive city. It hosts the headquarters of 37 Fortune Global 500 companies, the Tokyo Stock Exchange (world's third-largest by market cap), and serves as Asia's primary financial center alongside Shanghai and Singapore. Tokyo's transit system (carrying 40 million passengers daily) is the world's busiest and most punctual.

Delhi: The World's Next #1 by 2028–2030

The National Capital Territory of Delhi and its surrounding National Capital Region (NCR) form the world's fastest-growing megacity, adding approximately 700,000 people per year through a combination of natural growth (high birth rates in migrant populations) and massive rural-urban migration from Uttar Pradesh, Bihar, Rajasthan, and Haryana.

Delhi's growth creates enormous infrastructure challenges. The city experiences severe air pollution (AQI regularly exceeding 400 in winter, classified as "hazardous"), water stress (per capita water availability of approximately 50 liters/day versus the WHO-recommended 100 liters), traffic congestion (average commute time of 75 minutes), and housing shortage (estimated 1.5 million unit deficit).

However, Delhi is also India's wealthiest city, with per capita income approximately 3x the national average. The Delhi Metro (covering 350+ km with 250+ stations) is one of the world's most successful modern mass transit systems, carrying 6 million passengers daily and dramatically improving urban mobility since its 2002 launch.

Shanghai and Beijing: China's Urban Powerhouses

Shanghai (28.5M) and Beijing (21.8M) are China's two largest cities and together generate approximately 12% of China's GDP. Shanghai is China's financial and commercial capital, hosting the Shanghai Stock Exchange and Lujiazui financial district. Beijing is the political, cultural, and technology capital, home to the Chinese government, Tsinghua and Peking universities, and major tech companies (ByteDance, Baidu, JD.com).

Both cities face slowing growth as China's government restricts migration through the hukou system and as the national population declines. Shanghai's growth has slowed to approximately 0.5%/year and Beijing to 0.3%/year. China's "city cluster" strategy is redirecting growth toward second-tier cities like Chengdu, Hangzhou, and Wuhan, which offer lower living costs and growing economic opportunities.

Asia's 22 Megacities: Home to 63% of the World's Largest Urban Areas

Asia dominates the megacity landscape with 22 of 35 global megacities. The biggest cities by population are overwhelmingly Asian. China alone has 8 megacities (Shanghai, Beijing, Guangzhou, Shenzhen, Chengdu, Tianjin, Wuhan, Hangzhou), reflecting the country's extraordinary urbanization from 20% urban (1980) to 66% (2025). China's demographic dynamics are explored in detail in analysis of the Chinese population's unprecedented decline from 1.426 billion.

India has 5 megacities (Delhi, Mumbai, Kolkata, Bangalore, Hyderabad) and is projected to add Chennai, Ahmedabad, and Pune by 2030. India's urban population will grow from approximately 500 million (2026) to 675 million by 2035, the fastest absolute urban growth of any country.

Southeast Asia's megacities face unique challenges. Jakarta (11M metro) is sinking at 10–25 cm per year due to groundwater extraction, prompting Indonesia's $33 billion capital relocation to Nusantara (Borneo). Manila (14.4M) is one of the world's most densely populated cities at 43,000 people/km². Bangkok (11M) faces severe flooding risks from sea level rise.

Japan and South Korea represent the opposite trend: Tokyo and Osaka are shrinking as Japan's population declines. Seoul's growth has stagnated as South Korea's fertility rate (0.72 TFR, world's lowest) reduces the pool of young urban migrants. These are the world's first "shrinking megacities."

Africa's Urban Explosion: Lagos, Kinshasa, and the Megacities of 2050

Africa currently has 3 megacities (Cairo 22.2M, Lagos 15.4M, Kinshasa 15.0M) but this number will grow to 10+ by 2050 as the continent's population nearly doubles from 1.5 billion to 2.4 billion. Lagos is projected to become the world's largest city by 2035–2040, potentially reaching 40 million residents.

Lagos grows by approximately 600,000 people per year (equivalent to adding a city the size of Milwaukee annually). The city's infrastructure is overwhelmed: only 10% of roads are paved in many outer districts, electricity supply covers approximately 50% of demand, and approximately 60% of the population lives in informal settlements.

Kinshasa (15M, growing at 3.8%/year) is projected to surpass Paris, London, and Los Angeles in population by 2030. The city stretches along the Congo River for 30 km but lacks a functioning public transit system, sewage network, or reliable power grid for most residents.

Other rapidly growing African cities include Dar es Salaam (Tanzania, 7.8M, +4.5%/year), Nairobi (Kenya, 5.5M, +3.8%/year), Addis Ababa (Ethiopia, 5.4M, +3.5%/year), and Luanda (Angola, 9.0M, +3.2%/year). These cities will collectively add over 100 million residents by 2050.

The African urbanization story is fundamentally different from the Asian model. In East Asia, urbanization was driven by manufacturing industrialization: factories pulled rural workers into cities where they earned higher wages and consumed more goods, creating a virtuous cycle of economic growth. In much of sub-Saharan Africa, urbanization is occurring without equivalent industrialization, creating what development economists call "premature urbanization" where cities grow through rural poverty push factors rather than urban employment pull factors.

This creates a scenario where millions move to cities like Lagos, Kinshasa, and Nairobi not because factory jobs await them but because rural life has become unsustainable due to drought, conflict, land degradation, or lack of basic services and educational opportunities. The result: enormous informal economies (estimated 80%+ of urban employment in sub-Saharan Africa is informal), widespread slum residence, and limited government capacity to provide basic services including clean water, electricity, and sanitation. International organizations including the World Bank and African Development Bank estimate that Africa needs approximately $130–170 billion annually in urban infrastructure investment through 2050 to accommodate projected growth, a funding gap that remains one of the most significant unmet urban development and infrastructure challenges on Earth today.

Delhi (33.8 million) is the world's fastest-growing megacity, adding approximately 700,000 people annually. The Indian capital is projected to surpass Tokyo as the world's largest city by 2028–2030. Meanwhile, African cities like Lagos, Kinshasa, and Dar es Salaam are growing at 3–5% annually, reshaping the global urban landscape.

Most Densely Populated Cities — From 43,000 to 400 People Per km²

Population density varies enormously between the world's largest cities. Manila leads global density rankings at approximately 43,000 people/km² (city proper), followed by Dhaka (36,000/km²), Mumbai (31,000/km²), and Hong Kong (28,000/km²). Within these cities, individual neighborhoods reach extraordinary densities: Dharavi (Mumbai) packs approximately 300,000 people per km², making it one of the densest inhabited areas on Earth.

In contrast, many large cities have surprisingly low density due to sprawling metropolitan boundaries. Los Angeles (approximately 3,300/km²), Houston (1,400/km²), and Atlanta (700/km²) are among the least dense major cities in the developed world, reflecting America's car-dependent suburban development model. The contrast between Asian density (vertical cities built around mass transit) and American sprawl (horizontal cities built around highways) represents fundamentally different models of urbanism with profoundly different economic, environmental, and social outcomes for their residents and the planet.

Density has economic implications. Dense cities are generally more productive per capita (New York, Tokyo, London generate 2–3x the GDP per worker of their national averages), have lower per-capita carbon emissions (due to shared infrastructure and public transit), and are more culturally innovative. However, extreme density without adequate infrastructure (as in Dhaka and Lagos) produces squalid living conditions, disease risk, and severe congestion.

Americas and Europe: Mature Megacities with Slowing Growth

The Americas have 8 megacities: São Paulo (22.6M, Latin America's largest), Mexico City (22.1M), New York (18.8M), Buenos Aires (15.5M), Lima (11.5M), Bogotá (11.3M), Los Angeles (12.5M), and Rio de Janeiro (13.5M). Growth rates in Latin American megacities have slowed dramatically from 3–4%/year in the 1970s to 0.5–1.0%/year in 2026, reflecting declining fertility rates and the completion of the rural-urban migration cycle.

Europe has only 2 megacities: Istanbul (15.9M, straddling Europe and Asia) and Moscow (12.6M). London (9.7M), Paris (11.2M metro), and the Ruhr area are close but fall below the 10 million metro threshold. European cities are characterized by high livability scores (Vienna, Copenhagen, Zurich consistently rank among the world's most livable) but declining or stagnating populations driven by low fertility and aging demographics.

New York (18.8M metro) remains the Western Hemisphere's largest metropolitan area and the world's primary financial center. The NYC metro generates approximately $1.8 trillion in GDP, more than the national GDP of South Korea. New York's population growth has slowed to approximately 0.2%/year, driven primarily by international immigration that offsets domestic outmigration to lower-cost states (Florida, Texas, North Carolina). The global e-commerce market that is reshaping urban retail landscapes is particularly transformative in wealthy megacities like New York, London, and Tokyo.

Largest City Economies by GDP — 2026

City GDP rankings differ significantly from population rankings. The wealthiest cities are not necessarily the largest. Tokyo leads both lists, but New York ($1.8T GDP, #11 by population) far outranks Delhi ($350B GDP, #2 by population). This reflects the enormous productivity gap between developed and developing-world megacities. The world's most productive cities are home to the world's most valuable corporations, with technology, finance, and services driving urban GDP.

Six Challenges Facing the World's Largest Cities