North 24 Parganas district has undergone remarkable rural–urban transformation during the post-independence period. The district experienced rapid demographic expansion, increasing urbanization, occupational diversification, and infrastructural development due to the influence of Kolkata Metropolitan Area. This paper analyzes the transformation using Census data from 1951 to 2011. The study highlights long-term trends in population growth, urbanization, literacy, density, and socio-economic change. Findings reveal that urban population increased dramatically after 1971 due to migration, suburbanization, industrialization and metropolitan expansion. While urban development is going on with education, infrastructure and employment opportunities, it also produced environmental stress, decline of agricultural land, congestion and social inequality. The paper emphasizes the need for sustainable regional planning and balanced development policies for such Rural–Urban Transformation.