Buenos Aires Population: 3M City / 15.6M Metro (2023)

As of 2023 estimates:

• City of Buenos Aires (CABA): ~3.1 million (203 km²) — autonomous federal district
• Greater Buenos Aires (AMBA - Agglomerado Gran Buenos Aires): ~15.6 million — includes 40+ partidos (municipalities) in Buenos Aires Province
• Ranking: #1 metro in Argentina; #2 in South America (after São Paulo ~22M); ~#15 globally

📊 Population Dynamics

• City proper: Stable/slight decline (aging, housing costs, suburbanization)
• Metro: Growing — ~1% annually (internal migration, immigration)
• Density: City: 15,000/km²; Metro avg: 2,500/km² (highly variable)
• Daytime population: City swells to ~4M+ (commuters from province)

🏙️ Key Partidos (Suburbs) in AMBA

• La Matanza (1.8M) — largest partido
• Lomas de Zamora (700K)
• Quilmes (650K)
• Almirante Brown (600K)
• Moreno, Merlo, San Martín, Malvinas Argentinas, Tigre, Vicente López, San Isidro

🌍 Demographics

• European descent: ~85% (Italian, Spanish, German, Jewish, Arab, etc.)
• Mestizo/Indigenous: ~10% (growing self-ID)
• Afro-Argentine: ~1% (historically undercounted)
• Asian: ~2% (Chinese, Korean, Japanese communities)
• Immigrants: 13% foreign-born (Paraguay, Bolivia, Peru, Venezuela, Italy, Spain)

📈 Historical Context

• 1869: 187K | 1914: 1.5M | 1947: 3M | 1970: 8.4M (metro) | 2001: 12M | 2023: 15.6M
• Growth slowed — fertility 1.6, aging, but sustained by migration

Source: INDEC (Argentina census bureau) projections + UN World Urbanization Prospects.