The Census is a decennial administrative concept and institution that involves the total process of collecting, compiling, and disseminating demographic, economic, and social data of all persons in India. Constitutionally, the population census is a Union subject under Article 246, listed at entry number 69 of the Seventh Schedule. The first non-synchronous census was conducted in 1872, and the first synchronous census was held in 1881 by W.C. Plowden to aid the colonial administration in taxation and governance. Post-independence, the legal framework is the Census Act, 1948, which was piloted by Sardar Vallabhbhai Patel.
The mechanism is overseen by the Office of the Registrar General and Census Commissioner, Ministry of Home Affairs. The Central Government is empowered under Section 3 of the Census Act, 1948 to notify the census. The Act mandates that citizens are legally bound under Section 8(2) to provide accurate information. A key provision is the guarantee of confidentiality: the collected individual data is not accessible to courts of law and can only be used for statistical purposes.
The data is crucial for policy-making, connecting directly to the Delimitation of constituencies and the allocation of seats to Parliament, as mandated by Article 82 of the Constitution. The census, originally scheduled for 2021, was postponed and is now planned for 2027. The Census 2027 will be the first fully digital census, utilizing mobile applications and offering an option for self-enumeration. A significant change is the inclusion of caste enumeration for all communities, which has not been systematically done since 1931. The core structure, however, remains a two-phase process (Houselisting and Population Enumeration) governed by the Census Act, 1948.