In 2015, the population of Kolkata amounted to more than ** million inhabitants, showing an increase of approximately *** million inhabitants compared to the year 2000. The population density across the country stood at around *** thousand people per square kilometer in 2015.

Delhi was the largest city in terms of number of inhabitants in India in 2023.The capital city was estimated to house nearly 33 million people, with Mumbai ranking second that year. India's population estimate was 1.4 billion, ahead of China that same year.

Kolkata is a city with a population of 6,589,906 and lies in the 5000 and above (Very High) density category. The city has an area of 212.13 km² with a total green space of 21% and a tree coverage of 16%. The city lies in the Torrid Zone of the world. The city has improved its Urban green space per capita when compared to Global Average and also improved its Urban green space per capita when compared to previous year. Within South and West Asia, 50.0% of cities are ranked lower than Kolkata.