Census of India

The decennial census of India has been conducted 15 times, as of 2011. While it has been undertaken every 10 years, beginning in 1872 under Viceroy Lord Mayo, the first complete census was taken in 1872. Post 1949, it has been conducted by the Registrar General and Census Commissioner of India under the Ministry of Home Affairs, Government of India. All the censuses since 1951 were conducted under the 1948 Census of India Act, which predates the Constitution of India. The 1948 Census of India Act does not bind the Union Government to conduct the census on a particular date or to release its data in a notified period. The last census was held in 2011, whilst the next was to be held in 2021 before it was postponed due to the COVID-19 pandemic in India. The next 16th census will commence from 1st October 2026 for the Himalayan states and 1st March 2027 for rest of the Indian states.

The 1951 census of India was the ninth in a series of censuses held in India every decade since 1872. It was also the first census after independence and Partition of India. 1951 census was also the first census to be conducted under 1948 Census of India Act. The first census of the Indian Republic began on February 10, 1951.

The 1961 census of India was the tenth in a series of censuses held in India every decade since 1872.

The 1971 census of India was the 11th in a series of censuses held in India every decade since 1872.

The 1991 census of India was the 13th in a series of censuses held in India every decade since 1871.

The 2001 census of India was the 14th in a series of censuses held in India every decade since 1871.

The 2011 census of India or the 15th Indian census was conducted in two phases, house listing and population enumeration. The House listing phase began on 1 April 2010 and involved the collection of information about all buildings. Information for National Population Register (NPR) was also collected in the first phase, which will be used to issue a 12-digit unique identification number to all registered Indian residents by Unique Identification Authority of India. The second population enumeration phase was conducted between 9 and 28 February 2011. Census has been conducted in India since 1872 and 2011 marks the first time biometric information was collected. According to the provisional reports released on 31 March 2011, the Indian population increased to 1.21 billion with a decadal growth of 17.70%. Adult literacy rate increased to 74.04% with a decadal growth of 9.21%. The motto of the census was Our Census, Our Future.

Spread across 28 states and 8 union territories, the census covered 640 districts, 5,924 sub-districts, 7,935 towns and more than 600,000 villages. A total of 2.7 million officials visited households in 7,935 towns and 600,000 villages, classifying the population according to gender, religion, education and occupation. The cost of the exercise was approximately ₹2,200 crore (US$260 million) – this comes to less than US$0.50 per person, well below the estimated world average of US$4.60 per person.