Census & Demographics
Census & Demographics
The Census of India is the largest single administrative exercise in the world, enumerating every person in the country. Conducted by the Registrar General and Census Commissioner of India (under the Ministry of Home Affairs), it provides the foundational data for planning, policy-making, and governance. India's demographic profile — with 1.44 billion people, a young median age, and a rapidly closing demographic dividend window — is central to economic and social planning.
Key Dates
First non-synchronous census in India conducted under Viceroy Lord Mayo
First synchronous (regular) census conducted under W.W. Plowden — the starting point of India's decennial census
Latest completed census — India's population was 1,210,854,977; sex ratio 943; literacy 74.04%
India became the world's most populous country, surpassing China (~1.44 billion vs ~1.42 billion)
Scheduled for 2021 but postponed due to COVID-19; status uncertain as of 2026
India's working-age population (15-64) is ~68%; window closes ~2055-60
Most populous state: Uttar Pradesh (~200 million, 2011); Bihar has the highest decadal growth rate (25.07%)
Highest sex ratio (1,084 females per 1,000 males) and literacy (93.91%) — 2011 Census
Sample Registration System provides annual estimates of birth, death, and growth rates between censuses
History and Organization of the Indian Census
The Indian Census is the world's largest peacetime administrative exercise. A non-synchronous census was first attempted in 1872 under Viceroy Lord Mayo. The first systematic, synchronous decennial census was conducted in 1881 under the Census Commissioner W.W. Plowden. Since then, the census has been conducted every 10 years without interruption — 2011 was the 15th census in the series (1881, 1891, ..., 2001, 2011). The 2021 Census was postponed due to COVID-19 and remains pending. The Census is conducted by the Office of the Registrar General and Census Commissioner (ORGI), under the Ministry of Home Affairs. The Census Act of 1948 provides the legal framework; the Census Rules of 1990 prescribe the methodology. The census is conducted in two phases: (1) Houselisting and Housing Census — lists all residential buildings, their conditions, amenities (water, sanitation, electricity), and assets (mobile phones, internet, vehicles); (2) Population Enumeration — counts every individual and records demographic information (age, sex, marital status, literacy, education, occupation, religion, SC/ST status, disability, mother tongue, migration). The Census of 2011 was the first to use a "paper and pen" approach for enumeration with subsequent digitization; future censuses plan to use mobile-based digital enumeration. Key census concepts: De facto population (all persons present in a place on the reference date, regardless of usual residence) — India uses this method; De jure population (all usual residents, even if temporarily absent). The 2011 Census deployed about 2.7 million enumerators and 300,000 supervisors to count 1.21 billion people.
Population Growth and Distribution
India's population in the 2011 Census was 1,210,854,977 — 623.7 million males and 587.1 million females. India became the world's most populous country in 2024, surpassing China at approximately 1.44 billion. Population growth history: 1901: 238 million; 1951: 361 million; 1971: 548 million; 1991: 846 million; 2001: 1,029 million; 2011: 1,211 million. The decadal growth rate has been declining: 1991-2001: 21.54%; 2001-2011: 17.72%. The annual growth rate in 2011 was about 1.64%; it has further declined to about 0.87% (2024 estimate). Total Fertility Rate (TFR) has dropped to 2.0 (NFHS-5, 2019-21) — at replacement level. State-wise distribution (2011): Uttar Pradesh is the most populous state (~200 million — more than Brazil); followed by Maharashtra, Bihar, West Bengal, Madhya Pradesh, Tamil Nadu, Rajasthan, Karnataka. The six most populous states (UP, Maharashtra, Bihar, WB, MP, TN) account for about 55% of India's total population. Least populous states: Sikkim (6.1 lakh), Mizoram (10.9 lakh), Arunachal Pradesh (13.8 lakh). Population density (2011): India average — 382 persons per sq km; highest: Delhi (11,320), Chandigarh (9,252), Bihar (1,106), West Bengal (1,028), Kerala (860); lowest: Arunachal Pradesh (17), Mizoram (52), Sikkim (86). Rural-urban split: 68.8% rural, 31.2% urban (2011); urbanization has been accelerating — estimated at about 36% by 2026.
Sex Ratio, Literacy, and Key Indicators
Sex Ratio — the number of females per 1,000 males — is a critical indicator of gender equity. India's overall sex ratio (2011): 943 females per 1,000 males — improved from 933 in 2001 but still among the lowest globally. Child sex ratio (0-6 years): 914 (2011) — a concerning decline from 927 in 2001, indicating continued son preference and sex-selective practices. State-wise sex ratio (2011): Highest — Kerala (1,084), Tamil Nadu (996), Andhra Pradesh (993), Chhattisgarh (991), Manipur (992); Lowest — Haryana (879), J&K (889), Sikkim (890), Punjab (895), Delhi (868). The NFHS-5 (2019-21) sex ratio at birth has improved to 929 from 919 in NFHS-4. Literacy Rate (2011): India overall — 74.04% (82.14% male, 65.46% female); gender gap: 16.68 percentage points. State-wise: Highest — Kerala (93.91%), Lakshadweep (92.28%), Mizoram (91.58%); Lowest — Bihar (63.82%), Arunachal Pradesh (66.95%), Rajasthan (67.06%). The literacy rate has improved dramatically: 1951 (18.33%) → 1991 (52.21%) → 2011 (74.04%). India's Gender Inequality Index (GII) rank: 122 out of 191 countries (2023 HDR). Other important census indicators: Workers (2011): 481.9 million total workers (39.8% of population); female work participation rate: 25.5% (significantly lower than male: 53.3%); National Family Health Survey (NFHS-5, 2019-21) provides inter-census health and demographic data: TFR 2.0, IMR ~35 per 1,000 live births, institutional deliveries 89%, full immunization 76.4%.
Demographic Transition and the Dividend
India is in the third stage of the Demographic Transition Model (DTM): birth rates are declining but remain higher than death rates, resulting in continued population growth but at a decelerating rate. The DTM has four stages: Stage 1 (Pre-industrial): High birth rate, high death rate, stable population — India was in this stage until the early 20th century. Stage 2 (Early transition): Death rate falls (better healthcare, sanitation), birth rate remains high — rapid population growth — India was in this stage from ~1920s to ~1970s; this is when India's population exploded. Stage 3 (Late transition): Birth rate falls (urbanization, education, family planning), death rate stabilizes at a low level — growth decelerates — India entered this stage in the 1980s-90s and is firmly in it now. Stage 4 (Post-industrial): Both rates are low, population stabilizes or declines — Kerala and Tamil Nadu are approaching this stage; India as a whole is projected to reach this by 2060-65. Demographic Dividend: India's working-age population (15-64 years) currently constitutes about 68% of the total population — the highest proportion in India's history. This "demographic dividend" — when the share of the working-age population exceeds the dependent population — presents an opportunity for accelerated economic growth if the workforce is skilled, healthy, and employed. This window opened around 2005 and is projected to close around 2055-60. Countries like Japan, South Korea, and China leveraged their demographic dividend for rapid economic growth. India's challenge: jobless growth, low female labor force participation (only ~25%), skill deficit (only ~5% of the workforce is formally trained), and regional disparities (states like UP, Bihar have young populations but inadequate employment, while southern states are already aging). India's median age is about 28.4 years (2024) — one of the youngest among major economies.
Religion, Language, and Social Categories
Religion (Census 2011): Hindu — 79.80% (966.3 million), Muslim — 14.23% (172.2 million), Christian — 2.30% (27.8 million), Sikh — 1.72% (20.8 million), Buddhist — 0.70% (8.4 million), Jain — 0.37% (4.5 million), Others (including tribal religions) — 0.66%, Not Stated — 0.24%. The Muslim population growth rate (24.6% in 2001-11) was higher than the Hindu rate (16.8%), but this gap has been narrowing as Muslim TFR also declines. Language (Census 2011): India has 22 Scheduled Languages (Eighth Schedule of the Constitution) and 1,369 rationalized mother tongues. Hindi (in various dialects) is spoken by about 43.6% as a mother tongue; Bengali (8.0%), Marathi (6.9%), Telugu (6.7%), Tamil (5.7%), Gujarati (4.6%), Urdu (4.2%), and Kannada (3.6%) are other major languages. English is spoken by about 10.7% as first, second, or third language (2011). The Linguistic Survey of India (started 1894 by George Abraham Grierson) documented India's linguistic diversity. Social Categories (Census 2011): Scheduled Castes (SC) — 16.6% (201.4 million); Scheduled Tribes (ST) — 8.6% (104.3 million); Other Backward Classes (OBC) — not enumerated in the census directly (estimated ~52% by Mandal Commission); a Socio-Economic Caste Census (SECC) was conducted in 2011 separately from the main census, enumerating caste details in the rural and urban sector. The demand for a full caste census in 2021/2031 remains a significant political issue.
Migration Data from the Census
The Census records migration data based on the place of birth and place of last residence of every enumerated person. Census 2011 migration data: Total migrants — about 455.8 million (37.7% of the population) changed their place of residence at some point. By type: Intra-district (within the same district) — 67.1%; Inter-district (within the same state) — 17.4%; Inter-state — 12.0%; International — 3.5%. By reason: Marriage — 49.4% of all migrants (overwhelmingly female; marriage is the dominant reason for female migration in India); Work/Employment — 17.9%; Moved with household — 14.7%; Education — 3.8%; Other — 14.2%. Gender dimension: About 67% of all migrants are female (overwhelmingly due to marriage-related migration); male migration is predominantly for work/employment. Major migration corridors: (1) Rural-to-Urban — the dominant economic migration pattern; from Bihar, UP, Rajasthan, MP, Jharkhand, and Odisha to Delhi, Mumbai, Bengaluru, Chennai, Hyderabad, and other cities; (2) Inter-state — Bihar → Delhi NCR, UP → Delhi/Mumbai, Rajasthan → Gujarat/Maharashtra, Odisha → Gujarat/TN; (3) International emigration — India has one of the world's largest diasporas (~32 million); major destinations: UAE, USA, Saudi Arabia, UK, Canada; remittances to India (~$125 billion, 2023) are the highest in the world. The COVID-19 pandemic (2020) exposed the vulnerability of internal migrants — an estimated 10 million migrant workers returned to their home states during the lockdown, highlighting inadequate data and policy attention to internal migration. The e-Shram portal (2021) registered over 290 million unorganized/informal workers, many of whom are migrants.
Sample Registration System and Inter-Census Data
Between decennial censuses, India relies on several data systems for demographic monitoring: (1) Sample Registration System (SRS) — established in 1964-65 by the ORGI; a continuous demographic survey based on a dual-record system; provides annual estimates of birth rate, death rate, infant mortality rate (IMR), maternal mortality ratio (MMR), and fertility rates at the state and national level; covers about 8,000 sample units (half rural, half urban) across India. SRS data (2020): CBR: 19.5 per 1,000; CDR: 7.4 per 1,000; Natural Growth Rate: 12.1 per 1,000; IMR: 28 per 1,000 live births; MMR: 97 per 100,000 live births (SRS 2018-20); TFR: 2.0. (2) National Family Health Survey (NFHS) — conducted by the International Institute for Population Sciences (IIPS, Mumbai) under the Ministry of Health; NFHS-5 (2019-21) is the latest; covers fertility, family planning, child nutrition, health, mortality, morbidity, and domestic violence; the Indian equivalent of the global Demographic and Health Survey (DHS). (3) Civil Registration System (CRS) — registration of births and deaths at the local level; coverage has improved significantly: birth registration ~93%, death registration ~92% (2020). (4) Economic Census — conducted by MoSPI; enumerates all establishments engaged in economic activities; the 7th Economic Census (2019) was the latest. (5) Annual Health Survey (AHS) — covers high-focus states (the EAG states — Empowered Action Group: Bihar, Jharkhand, UP, Uttarakhand, MP, Chhattisgarh, Rajasthan, Odisha, and Assam); provides district-level vital statistics. Understanding these data sources is important because the postponed 2021 Census means policy decisions currently rely on projections and survey data rather than complete enumeration.
Population Policy and Family Planning in India
India was the first country in the world to adopt an official family planning programme in 1952. Key milestones: 1952: National Family Planning Programme launched — initially focused on the "clinic approach" (providing contraception at health facilities); limited impact. 1966: Department of Family Planning established; target-based approach to sterilization adopted. 1976-77: Emergency period — coercive sterilization programme under Sanjay Gandhi; massive public backlash; the programme's name was changed to "Family Welfare" after 1977 to emphasize voluntarism. 1977: "Family Planning" renamed "Family Welfare" — shift from coercion to incentive-based, voluntary approach; contraceptive choice expanded. 2000: National Population Policy (NPP 2000) — target of achieving replacement-level TFR of 2.1 by 2010 (achieved by 2020); promoting spacing methods, delaying marriage, and universal access to contraception; goal of population stabilization by 2045. India's TFR has declined dramatically: 5.9 (1951) → 4.5 (1981) → 3.2 (2001) → 2.0 (NFHS-5, 2019-21) — now at or below replacement level. However, due to population momentum (the large number of women of reproductive age already born), India's population will continue to grow until about 2060-65, when it is projected to peak at approximately 1.7 billion before declining. State-level disparities are significant: Kerala (TFR 1.8), Tamil Nadu (1.8), Telangana (1.8), and West Bengal (1.6) are well below replacement; Bihar (3.0), Meghalaya (2.9), and UP (2.4) are above replacement. The Mission Parivar Vikas targets 146 high-fertility districts across 7 states. Current focus: promoting spacing methods, improving access to modern contraception, reducing unmet need for family planning, and addressing the teenage pregnancy issue.
Relevant Exams
Census and demographics is a heavily tested topic across all exams. UPSC asks about census methodology, demographic transition, population policy, and the demographic dividend. SSC/RRB exams test specific Census 2011 data — population, sex ratio, literacy, most/least populous states, and density. Questions on TFR trends, the SRS, NFHS-5 findings, and India surpassing China as the most populous country are frequently asked. The postponed 2021 Census is relevant for current affairs questions.