India's decennial census has not been conducted since 2011, a 15-year gap that is the first since independence and leaves 1.4 billion people counted by projection rather than enumeration

Summary

India last conducted a decennial population census in 2011. The 2021 Census, scheduled to begin with a house-listing phase in April 2020, was suspended due to COVID-19 and has not been completed as of mid-2026, making it the first missed decennial count in India since the country's first post-independence census in 1951. The delay has extended to 15 years, which is the longest census gap for any country of comparable size in the post-World War II era. All current estimates of India's population, including the widely cited figure of approximately 1.44 billion used by the UN and World Bank, are statistical extrapolations from 2011 data, with adjustment models that carry significant uncertainty for a country with large state-level fertility differentials. The delay affects welfare programme targeting, parliamentary constituency delimitation, and economic planning at all levels of government.

The split

The Indian government attributed successive postponements to COVID-19 disruption, the need to revise enumeration methodology (particularly to integrate a digital census app), and the scheduling conflict with the 2024 general elections. Opposition parties and civil society organisations argued that the delay was also partly strategic: the delimitation of Lok Sabha constituencies, which is constitutionally required to follow a decennial census, would shift political weight significantly from India's slower-growing southern states (which also tend to vote for opposition parties) toward the faster-growing northern states (which tend to support the ruling BJP). Without fresh census data, the delimitation, and with it a significant shift in southern states' relative representation, cannot proceed. Demographers noted separately that the 15-year gap was creating a growing divergence between official population denominators and actual population in fast-growing districts.

By the numbers

• 2011: last completed Indian decennial census
• 15 years: gap since the last enumeration as of 2026
• 1.44 billion: UN/World Bank estimated population (extrapolated, not enumerated)
• 75%: share of rural India covered by National Food Security Act (calculated on 2011 data)
• 543: Lok Sabha seats currently distributed based on 1971 census data (delimitation frozen)
• 2024: year of India's general election, cited as one reason for 2021 census postponement

Why it matters

India's India Demography census gap matters at multiple scales. At the household level, welfare entitlements, voter lists, and health programme allocations are miscalibrated for a population that has changed substantially since 2011, particularly in urbanising northern states. At the national level, the constitutional requirement for periodic delimitation of Lok Sabha constituencies cannot be met without fresh enumeration data, creating a democratic representation problem as population distribution shifts. At the international level, India is now the world's most populous country by most estimates, but the uncertainty in its population figures, growing with every year of delay, compromises the quality of global demographic modelling at its most important input.

What to watch

• Whether the Indian government announces a firm census start date in 2026 or 2027
• The political process around delimitation, scheduled for completion before the 2029 general election, and which states gain or lose seats
• Whether the UN Population Division issues a revised uncertainty note for India's population projections
• How the census delay affects India's devolution formula, which allocates central tax revenues to states based partly on population