Why is Mumbai one of the world’s most densely populated urban areas?

Mumbai is one of the world’s most densely populated urban areas primarily due to its limited physical geography combined with a massive, ongoing influx of people seeking employment.12

The city’s high population density is driven by several key factors:

• Geographic Constraints: Mumbai is situated on an island, which imposes strict physical limits on its expansion. This restricted land area forces a high concentration of residents within a confined space.12
• Economic Migration: As India’s financial and commercial hub, Mumbai serves as a major center for industry and technology. This status attracts a steady stream of people from across the country in search of work, significantly driving up the population.132
• Housing Shortages: The scarcity of affordable housing, coupled with the city's limited space, has led to widespread overcrowding and the development of makeshift, often illegal, squatter settlements to accommodate the growing population.14

While city planners have attempted to encourage development in areas like Navi Mumbai to alleviate this pressure, the city continues to struggle with the challenges of extreme density and infrastructure strain.54