Buenos Aires
Buenos Aires (15.5 million inhabitants): major city of Argentina, with country factbook, ranking and leader links.
Last updated: October 2026
| Country | Argentina |
|---|---|
| Population | 15.5 million |
| Capital | Yes — national capital |
Source: UN World Urbanization Prospects, 2022 Revision (metropolitan agglomeration estimate). Observation date: 2022. The Bureau cross-checked major-city figures against UN WUP; smaller-city figures are presented as published and have not been individually re-verified.
Buenos Aires has a metropolitan population of 15.5 million, according to the UN World Urbanization Prospects (2022 Revision) cited on this page.
Buenos Aires is in Argentina. It is the national capital of Argentina.
Buenos Aires is the national capital of Argentina. As the capital, it is the country’s seat of government. The Bureau’s profile records its population and country context; see the Argentina factbook for the wider national picture.