The Census of India is conducted decennially by the Registrar General of India (RGI) and is one of the world's largest data collection exercises, covering over 1.4 billion people. Enumerators are ground-level data collectors who visit every household in an assigned area (typically 150–200 households) to collect census questionnaire information on population, housing, migration, education, employment, and other socioeconomic indicators. Supervisors oversee 5–6 enumerators each, verify enumeration completeness, resolve field-level issues, and ensure quality of data collection. Both roles require meticulous attention to detail and strong communication skills.

The exam covers Census Procedures and Methodology (purpose of census, house-listing operations, population enumeration, questionnaire content, coding conventions, census concepts for housing and household definitions), General Studies and Current Affairs (Indian polity, economy, population statistics, government programmes), Regional Language or Hindi (grammar, comprehension), and Basic Reasoning and Arithmetic (number series, basic calculations, data tables). Candidates must also understand the concepts of usual place of residence, migration, literacy, and economic activity as defined in census schedules.

The India Census was due in 2021 but was postponed due to the COVID-19 pandemic. As of 2025, the census has not yet been conducted. The government has indicated that census operations will begin when logistically feasible, with 2025–2026 being the expected window. The upcoming census will be India's first digital census using a mobile-based app for data collection by enumerators. This digital modality will be an important topic for census recruitment exams, covering data entry procedures, app-based enumeration workflows, and data quality verification processes.

Key census concepts include: household definition (persons living together and sharing a common kitchen), usual place of residence rule, temporary and permanent migration definitions, literacy definition (ability to read and write with understanding), main worker and marginal worker classifications, non-worker classification, the distinction between census houses and households, independent buildings and census houses, scheduled castes/tribes enumeration methodology, and the house listing cum housing census schedule. Understanding the Primary Census Abstract data structure and how census data is tabulated is useful for interpretation-based questions.

No, census Enumerator and Supervisor roles are temporary appointment-based engagements tied to the census exercise, which lasts approximately 2–3 years (including House Listing and Population Enumeration phases). They are typically filled by existing government employees (teachers, anganwadi workers, postal staff) on temporary duty with additional allowances, or by temporary contract appointment. The experience and training gained in census work is valuable for understanding statistical data collection and can support career advancement in government service, research organisations, and development agencies that use census data.