The world’s largest capital city is more populous than many entire countries. The smallest official capitals would barely fill a stadium.
How to Play: Guess if the capital on the right has a HIGHER or LOWER metropolitan population than the one on the left.
Name A
Name B
Top 10 Largest Capital Metropolitan Areas
Tokyo’s metropolitan area, including the surrounding Yokohama–Kawasaki conurbation, is home to roughly 37 million people — more than the entire population of Canada. Several other capitals comfortably top 20 million.
Capitals are a special category: in many countries they are also the largest city, but not always. Brasília, Canberra, Ottawa, and Washington D.C. were all built or chosen as capitals partly to avoid putting the seat of government in the country’s biggest city.
| # | Name | Metro Population | Unit |
|---|---|---|---|
| 1 | Tokyo (Japan) | 37,000,000 | people |
| 2 | Delhi (India) | 33,000,000 | people |
| 3 | Dhaka (Bangladesh) | 23,000,000 | people |
| 4 | Cairo (Egypt) | 22,000,000 | people |
| 5 | Mexico City (Mexico) | 22,000,000 | people |
| 6 | Beijing (China) | 22,000,000 | people |
| 7 | Buenos Aires (Argentina) | 16,000,000 | people |
| 8 | Manila (Philippines) | 14,000,000 | people |
| 9 | Moscow (Russia) | 13,000,000 | people |
| 10 | Jakarta (Indonesia) | 11,000,000 | people |
How Capital City Population Is Counted
The number you cite for a capital city’s population depends entirely on which boundary you use. Tokyo ‘city proper’ has about 14 million people, the Tokyo Metropolis administrative region has 23 million, and Greater Tokyo (the connected urban region including Yokohama and Kawasaki) reaches 37 million. The figures here use metropolitan-area population, the most useful for comparing how many people actually live in and around each capital.
Some capitals are deliberately small. Brasília was built from scratch in the 1950s on an empty plateau in central Brazil to move the federal government away from the coast. Canberra was chosen as a compromise between Sydney and Melbourne. Washington D.C. was placed on the Potomac to balance northern and southern states. All three remain modest in size compared to their countries’ commercial capitals (São Paulo, Sydney/Melbourne, New York).
South Africa is unusual: it has three official capitals. Pretoria is the executive capital, Cape Town the legislative, Bloemfontein the judicial. We use Pretoria’s population since the executive seat is the most-cited reference.
Capital cities tend to grow faster than national averages because they concentrate government employment, foreign embassies, and supporting service industries. Lagos was Nigeria’s capital until 1991 when the government moved to Abuja, partly to relieve pressure on Lagos and partly for ethnic-political balance — but Lagos itself has continued to grow much faster than Abuja.
Frequently Asked Questions
What is the largest capital city in the world?
Tokyo, by metropolitan-area population, at approximately 37 million people. By city-proper figures, Beijing or Delhi can rank higher depending on the definition.
Why do some countries have multiple capitals?
Several countries split government functions across cities for political balance: South Africa (Pretoria, Cape Town, Bloemfontein), the Netherlands (Amsterdam ceremonial, The Hague administrative), and Bolivia (Sucre constitutional, La Paz seat of government).
Why is Canberra so small?
Canberra was built specifically as a planned capital in 1913 on a compromise site between Sydney and Melbourne. It has stayed small because it is primarily a government town, with limited commercial industry.
Is Lagos still Nigeria's capital?
No. Nigeria moved its capital from Lagos to Abuja in 1991. Lagos remains Nigeria’s biggest city and economic hub, with about 22 million people in its metropolitan area — far larger than Abuja’s 3.6 million.
Note: Populations are 2024 metropolitan-area estimates from the UN World Urbanization Prospects and national statistics offices. Boundaries vary by source.
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