What Is a Millionaire City? Definition, Examples & Global Trends

A millionaire city (more commonly termed a million-plus city) is an urban agglomeration with a population of at least one million residents. The threshold is a standard demographic benchmark used by the UN, World Bank, and national statistical offices.

Current Landscape (2024 estimates)

• 500+ millionaire cities globally (up from ~300 in 2000).
• Largest: Tokyo (37M), Delhi (33M), Shanghai (29M), São Paulo (22M), Mexico City (22M), Cairo (22M), Mumbai (21M), Beijing (21M), Dhaka (21M), Osaka (19M).
• Fastest-growing: African cities (Kinshasa, Lagos, Luanda) and South Asian hubs.

Why the Classification Matters

• Economic engines: Concentrate GDP, innovation, FDI, and specialized labor markets.
• Infrastructure demand: Mass transit, housing, water, sanitation, digital connectivity.
• Policy focus: National urban policies, climate adaptation, and SDG 11 (sustainable cities) target these agglomerations.
• Tourism & culture: Major gateways, UNESCO sites, global events.

Nuance

"Millionaire city" can colloquially imply wealth concentration, but demographically it refers only to population size. For income-based metrics, terms like "high-net-worth individual (HNWI) density" are used.