The completion of the first phase of Census 2027’s door-to-door survey in New Delhi on May 16, 2026, marks a significant milestone in India’s decennial demographic exercise — a process that was last completed in 2011, making this the longest inter-census gap in independent India’s history. The New Delhi district covered 63,104 households in 585 blocks during the month-long Houselisting and Housing Operations (HLHO), while across the rest of Delhi under MCD jurisdiction, approximately 1.4 lakh people completed self-enumeration on the Census portal. The government’s deployment of Digital Layout Mapping (DLM) and the Census Management and Monitoring System (CMMS) represents the most technologically advanced census operation India has ever undertaken.
For Bihar — India’s third-most populous state with a 2011 population of approximately 10.4 crore, expected to have grown significantly by 2027 — the Census holds consequences that are at once administrative, political, and constitutional. The Census determines the allocation of central fiscal transfers under the Finance Commission formula, the planning of social welfare schemes, the delimitation of parliamentary and assembly constituencies (though frozen until 2026 under the Constitution’s 84th Amendment), and the preparation of the National Population Register (NPR) which has generated significant political controversy since 2019.
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For UPSC aspirants, the Census intersects with multiple GS papers: GS-I (Indian Society — demography, urbanisation, migration); GS-II (Governance — data systems, Finance Commission, delimitation); GS-III (Indian Economy — development planning, welfare scheme targeting). Bihar’s specific demographic profile — high population growth rate, high dependency ratio, high out-migration, and low urbanisation — makes the state a particularly important case study for the Census’s governance implications.
Background and Context: India’s Census History and the 2027 Exercise
Five Important Key Points
- The Census 2021, originally scheduled to commence in April 2020, was indefinitely postponed due to the COVID-19 pandemic and has now been redesignated as Census 2027, representing the longest delay in India’s post-independence census history and creating a 16-year gap between actual enumerations.
- The Census 2027 introduces significant technological innovations: a mobile app-based enumeration platform, self-enumeration portals, Digital Layout Mapping (DLM) replacing hand-drawn maps, and the Census Management and Monitoring System (CMMS) for real-time progress monitoring.
- Bihar’s 2011 population of approximately 10.4 crore was growing at 25.1% per decade — the highest growth rate among major states — and the 2027 Census is expected to reveal continued above-average growth, with implications for Bihar’s share of central fiscal transfers and political representation.
- The Supreme Court has intervened to ensure that the Census-linked National Population Register (NPR) process does not become a vehicle for implementing the National Register of Citizens (NRC) as it was attempted in Assam, and several state governments, including Bihar at different political junctures, have passed resolutions opposing the NRC.
- The Finance Commission, which uses population data as a key criterion for horizontal devolution of central taxes to states, will use 2011 Census data until Census 2027 data becomes available — meaning Bihar has been receiving transfers based on 16-year-old data that significantly underestimates its current population size.
Constitutional Framework: Census, Delimitation, and the 84th Amendment
The power to conduct Census vests with the Union Government under Entry 69 of the Union List (Seventh Schedule). The Census Act, 1948, and the Census Rules, 2990, provide the statutory framework. The Registrar General and Census Commissioner of India, under the Ministry of Home Affairs, is the designated authority.
The Constitution’s 84th Amendment (2001) froze the delimitation of parliamentary constituencies on the basis of the 1971 Census until the first Census after 2026. This means that after Census 2027 data is available, a Delimitation Commission will be constituted to redraw constituency boundaries based on the new population data. For Bihar, which has experienced rapid population growth since 1971, this delimitation could significantly increase its share of Lok Sabha seats — currently 40 out of 543. A larger population relative to the national average should translate into proportionally more seats, though the actual delimitation methodology will be determined by the Delimitation Commission.
Bihar’s Demographic Profile and Census Significance
Bihar’s demographic characteristics make it a uniquely important case for the Census 2027 exercise. The state has the highest population density among major states (exceeding 1,100 persons per square kilometre), one of the highest total fertility rates (TFR of approximately 3.0 against the national average of 2.0), a high dependency ratio, and significant gender disparities in literacy and workforce participation.
Crucially, Bihar has historically experienced massive out-migration — with an estimated 3-4 crore Bihari migrant workers residing in other states, particularly in Delhi NCR, Maharashtra, Gujarat, and Punjab. The Census must capture these migrants either at their origin (Bihar) or destination (other states) — a methodological challenge that the new mobile app-based platform is better equipped to address than traditional paper-based enumeration. The accurate counting of Bihar’s actual and de facto population has direct consequences for its share in central government schemes like MGNREGS, PM Awas Yojana, National Food Security Act coverage, and Finance Commission transfers.
Census and the Finance Commission Formula
The 15th Finance Commission (2021-26) used the 2011 population data as one criterion for horizontal devolution among states, but its formula also included newer demographic data — particularly the 2011 population combined with a separate weight for demographic changes reflected in the 2011 data itself. The 16th Finance Commission, which will determine resource allocation for 2026-31, will need to grapple with whether to continue using 2011 data or adopt Census 2027 interim data.
For Bihar, the stakes are enormous. If Census 2027 reveals that Bihar’s share of national population has increased from approximately 8.6% (2011) to, say, 9.5% (plausible given differential growth rates), and if the Finance Commission weights this proportionally, the additional annual fiscal transfers to Bihar could amount to tens of thousands of crores. This would fundamentally transform Bihar’s fiscal capacity for development expenditure.
The NPR Controversy and Bihar’s Position
The National Population Register (NPR), to be prepared alongside the Census, records usual residents of each locality with demographic particulars. Unlike the Census, which guarantees confidentiality, the NPR data can be shared with other agencies. The proposed NPR was viewed by several states as a precursor to the National Register of Citizens (NRC), which would require residents to prove citizenship through documentary evidence — a requirement seen as disproportionately burdensome for the poor, elderly, and marginalised, particularly in Bihar where documentary records are often incomplete due to historical administrative weakness.
The Bihar government has at various points taken positions reflecting the political complexity of this issue. The Nitish Kumar-led government has historically maintained that the NPR should not be linked to the NRC, and that existing documentation requirements should not be made more stringent for Bihar’s rural population.
Technological Challenges and Field Experience
The Delhi census experience revealed several implementation challenges relevant to Bihar: enumerators faced allegations of fraud and were denied entry by residents suspicious of data collection purposes; approximately 16,500 houses were found vacant and 3,400 locked during the month-long exercise; and some societies required special coordination for accessibility. In Bihar’s rural context, these challenges are likely to be significantly amplified — lower internet penetration complicates the self-enumeration portal approach, and greater social distrust of government officials may reduce cooperation with enumerators.
Way Forward
The Census 2027 exercise must include a robust public awareness campaign — in regional languages including Maithili, Bhojpuri, and Magahi in Bihar — that clearly communicates the Census’s confidentiality guarantees and its benefits for resource allocation. The mobile app-based platform must function offline in low-connectivity areas. Migrant worker enumeration requires a dedicated methodology — potentially using railway passenger records and Aadhaar-linked address data — to ensure accurate capture. Bihar’s state government must actively facilitate enumerator access and resolve community-level trust deficits through local elected representatives.
Relevance for UPSC and SSC Examinations
UPSC: GS-I (Indian Society — demography, urbanisation, migration, gender disparities); GS-II (Governance — Census Act, Finance Commission, Delimitation Commission, NPR vs NRC debate, 84th Constitutional Amendment); GS-III (Development planning, welfare scheme targeting). SSC: General Awareness (Census history, Census Act 1948, Finance Commission, Delimitation, NPR). Key terms: Census Act 1948, 84th Constitutional Amendment, Delimitation Commission, Finance Commission, National Population Register, NRC, Total Fertility Rate, CMMS, DLM, Registrar General of India.