As of the year 2024, the population of the capital city of India, Delhi was over 33 million people. This was a 2.63 percent growth from last year. The historical trends show that the population doubled between 1990 and 2010. However, the population growth rate in the last three years has been the lowest since the recorded period starting in 1960. The UN estimated that the population was expected to reach around 35 million by 2030. Reasons for population growth   As per the Delhi Economic Survey, migration added over 200 thousand people to Delhi’s population in 2022. The estimates showed relative stability in natural population growth for a long time before the pandemic. The numbers suggest a sharp decrease in birth rates from 2020 onwards and a corresponding increase in death rates in 2021 due to the Covid-19 pandemic. The net natural addition or the remaining growth is attributed to migration. These estimates are based on trends published by the Civil Registration System. National Capital Region (NCR) Usually, population estimates for Delhi represent the urban agglomeration of Delhi, which includes Delhi and some of its adjacent suburban areas. The National Capital Region or NCR is one of the largest urban agglomerations in the world. It is an example of inter-state regional planning and development, centred around the National Capital Territory of Delhi, and covering certain districts of neighbouring states Haryana, Uttar Pradesh, and Rajasthan. Noida, Gurugram, and Ghaziabad are some of the key cities of NCR. Over the past decade, NCR has emerged as a key economic centre in India.

Population projection for National Capital Region (NCR) in India during 2021 was estimated to be more than 71 million people. The National Capital Territory of Delhi accounted for around 20 million people. The total population of NCR was estimated to reach around 89 million by 2031. NCR is an urban agglomeration centered around the national capital territory of Delhi and includes certain districts of neighboring states of Haryana, Rajasthan, and Uttar Pradesh. A recent categorization of this region into three categories has been devised which divides the region into Core National Capital Territory of Delhi, Central National Capital Region (CNCR) Periphery including districts close to the core, and lastly, the rest of the NCR region.