Population of India

Population Growth and Distribution

India is the world's most populous country as of 2023, having surpassed China with an estimated population of approximately 1.43 billion. The 2011 Census recorded India's population at 1,210.9 million, making it the last decadal census with confirmed data. The 2021 Census was delayed due to COVID-19 and had not been published as of 2024. Understanding India's population trajectory requires examining both the absolute numbers and the rates of growth across successive censuses since 1872.

The history of India's population growth falls into four broad phases. The first phase from 1872 to 1921 is called the phase of stagnant or fluctuating growth. Population grew very slowly and even declined in some decades due to high birth rates being offset by equally high death rates from famines, epidemics (the 1918 influenza pandemic alone killed an estimated 12 to 17 million in India, making India the worst-affected country in the world), plague, cholera, and malaria. The year 1921 is called the Year of Great Divide because for the first time the death rate began a sustained decline while the birth rate remained high, marking the beginning of rapid population increase.

The second phase from 1921 to 1951 is the phase of steady population growth. The death rate began falling due to the introduction of modern medicine, vaccination programmes, better famine management by the colonial administration, and modest improvements in nutrition. Population grew from 251 million in 1921 to 361 million in 1951, an increase of 110 million over 30 years. The partition of British India in 1947 caused massive population transfers but had a net-neutral effect on total Indian population numbers.

The third phase from 1951 to 1981 is the phase of population explosion. With Independence, India launched systematic public health programmes under successive Five Year Plans: mass vaccination, malaria eradication campaigns (DDT spraying under the National Malaria Eradication Programme dramatically reduced mortality from 1952 onwards), smallpox eradication (India declared smallpox-free in 1977), improved maternal and child health services, and famine prevention through the Green Revolution. Death rates plummeted while birth rates remained high due to deeply entrenched social norms favouring large families, son preference, early marriage, and low female literacy and autonomy. Population growth rates reached their peak of 2.22 percent per year in the 1961-71 decade. India added 100 million people per decade through this period, with population reaching 683 million in 1981.

The fourth phase from 1981 onwards is the phase of high growth with declining rate. The rate of population growth has been falling since the 1980s as the Total Fertility Rate (TFR) has declined from about 5.9 in 1951 to approximately 2.0 in 2020 (the replacement level is 2.1). However, because the population base is so large, even a declining growth rate adds hundreds of millions in absolute terms. Population was 846 million in 1991, 1,029 million in 2001, and 1,211 million in 2011. The decadal growth rate fell from 23.87 percent in 1991-2001 to 17.64 percent in 2001-2011, the lowest since Independence. India is on a path to peak population around 1.5 to 1.6 billion sometime between 2040 and 2060 before beginning a gradual decline.

Population distribution across India is extremely uneven and reflects the interplay of physical geography (relief, rainfall, soil fertility, river systems), historical settlement patterns, economic development, and political boundaries. The 2011 Census shows population density ranging from 9,294 persons per square kilometre in Delhi to just 17 persons per square kilometre in Arunachal Pradesh. The Indo-Gangetic Plain, with its fertile alluvial soils, perennial rivers, flat terrain, good connectivity, and centuries of agricultural civilisation, contains the highest population concentrations. Uttar Pradesh with 199.8 million is the most populous state, followed by Maharashtra (112 million), Bihar (104 million), West Bengal (91 million), and Andhra Pradesh (84 million). Together these five states contain about 50 percent of India's population. The states of the northeastern region, Jammu and Kashmir, Himachal Pradesh, and Uttarakhand have very low population densities due to their mountainous terrain, harsh climate, limited agricultural land, and historically poor connectivity.

Among Union Territories, Delhi's extraordinary density reflects its status as the national capital and the associated concentration of government employment, services, trade, and infrastructure investment. The Andaman and Nicobar Islands and Lakshadweep have the lowest densities. The Deccan Plateau region of peninsular India has moderate densities, lower than the northern plains but higher than the mountainous periphery, reflecting its semi-arid climate and hard-rock terrain limiting agricultural productivity compared to the alluvial plains.

The spatial pattern of India's population has significant policy implications. High population density in already stressed regions like the Gangetic Plain creates pressure on land, water, and ecosystems. Low population density in the northeastern states and the Himalayan zone creates challenges of governance, development delivery, and border security. Internal migration is slowly redistributing population from high-density, low-income states (Bihar, Uttar Pradesh, Odisha, Rajasthan) to economically dynamic states (Maharashtra, Karnataka, Tamil Nadu, Gujarat, Delhi-NCR, Punjab), creating both opportunities and social tensions in receiving areas.

Demographic Characteristics

The Total Fertility Rate (TFR) is the average number of children a woman would bear if she lived through her reproductive years (15 to 49) at the current age-specific fertility rates. India's TFR has fallen dramatically from 5.9 in 1951 to about 2.0 in 2019-21 as reported by the National Family Health Survey 5 (NFHS-5, 2019-21). This is below the replacement level of 2.1, meaning that if maintained, India's population would eventually stabilise and decline. However, there is enormous variation by state: Kerala (1.8), Tamil Nadu (1.8), Delhi (1.6), and Himachal Pradesh (1.7) have below-replacement fertility, while Bihar (3.0), Meghalaya (2.9), Uttar Pradesh (2.4), and Jharkhand (2.3) remain above replacement. This differential has profound implications: the southern states will face population ageing and labour shortages sooner, while the BIMARU states (Bihar, Madhya Pradesh, Rajasthan, Uttar Pradesh - an acronym coined by demographer Ashish Bose) will continue adding population for longer. The fertility decline is driven by rising female literacy and education, increasing age at marriage, greater female labour force participation, urbanisation, and better access to contraception and family planning services.

The Crude Birth Rate (CBR) is the number of live births per 1,000 population per year. India's CBR has fallen from about 41.7 in 1951 to approximately 19.5 in 2020. The Crude Death Rate (CDR) is the number of deaths per 1,000 population per year; it fell from 22.8 in 1951 to approximately 6.2 in 2020. The Natural Growth Rate (NGR = CBR minus CDR) was thus about 13.3 per 1,000 or 1.33 percent in 2020, compared to over 2 percent in the 1970s. India has successfully completed the epidemiological transition from a regime of high birth and death rates toward lower rates for both, but has not yet reached the final stage of very low birth rates seen in ageing developed countries.

Infant Mortality Rate (IMR) measures the number of deaths of infants under one year per 1,000 live births. India's IMR has declined from 146 in 1951 to 28 in 2020 (Sample Registration System data) but remains high compared to peers at similar income levels. There is sharp variation: Kerala achieves an IMR of 6 (comparable to developed countries), while Madhya Pradesh and Uttar Pradesh have IMRs above 40. IMR reflects the quality of maternal and child health services, nutrition, sanitation, and female education. Under-five mortality rate (U5MR) is a related indicator showing the probability of dying before age 5 per 1,000 live births; India's U5MR was approximately 32 in 2020, down from 116 in 1990.

Maternal Mortality Ratio (MMR) is the number of maternal deaths per 100,000 live births. India's MMR fell from 556 in 1990 to 97 in 2018-20 (Sample Registration System), having achieved the Millennium Development Goal target but still falling short of the Sustainable Development Goal target of below 70 by 2030. The highest MMR is in states like Assam (195) and Madhya Pradesh (163), while Kerala (19) and Maharashtra (33) have achieved very low levels. MMR reflects the quality of antenatal care, skilled birth attendance, emergency obstetric care, and women's nutritional status. The Janani Suraksha Yojana (JSY) - a conditional cash transfer scheme incentivising institutional delivery - significantly increased hospital births and is credited with contributing to the MMR decline.

Life expectancy at birth has risen dramatically from 32 years in 1947 to approximately 70 years in 2020 (male 68.4, female 71.1). This reflects the success of public health programmes in reducing mortality from infectious diseases, improvements in nutrition and food security since the Green Revolution, and better access to healthcare. However, life expectancy varies greatly by socioeconomic status, state, and gender. Kerala achieves a life expectancy of about 76 years, comparable to middle-income countries; states in central India cluster around 65 to 67 years.

India's sex ratio is the number of females per 1,000 males. India's sex ratio was 940 in 2011, an improvement from 933 in 2001, but still below the natural biological ratio of approximately 950 to 952. The low sex ratio reflects the cumulative effect of son preference expressed through sex-selective abortion (following the spread of ultrasound technology in the 1980s and 1990s), female infanticide (historically in some communities), differential neglect of girl children (resulting in higher female mortality), and underreporting of female births. The child sex ratio (CSR, females per 1,000 males in the 0 to 6 age group) is even more alarming: it was 919 in 2011, down from 927 in 2001, indicating that sex-selective practices increased despite legal prohibition under the Pre-Conception and Pre-Natal Diagnostic Techniques (PCPNDT) Act of 1994. Among states, Haryana had the worst CSR at 834 and Punjab at 846 in 2011, both states with high income but deeply entrenched son preference. The Beti Bachao Beti Padhao (Save the Daughter, Educate the Daughter) programme launched in 2015 specifically targeted districts with low CSR. Kerala and other southern states have generally better sex ratios reflecting higher female autonomy and education.

Literacy rate is defined as the proportion of the population aged 7 years and above who can read and write with understanding in any language. India's overall literacy rate was 74.04 percent in 2011 (82.14 percent for males, 65.46 percent for females), a significant improvement from 12 percent at Independence. However, the gender gap (about 16.7 percentage points in 2011) reflects decades of differential access to education for girls. State variation is extreme: Kerala has near-universal literacy (94 percent overall), while Bihar (63.8 percent overall, female literacy 53.3 percent) and Rajasthan (66.1 percent) have much lower rates. Northeast states generally have high literacy (Mizoram 91.6 percent, Tripura 87.2 percent) reflecting the strong emphasis on education by Christian missionaries and the relatively high status of women. Urban literacy (84.1 percent) is significantly higher than rural literacy (67.8 percent) in 2011, reflecting differential access to schools, lower opportunity costs of education, and greater returns to schooling in urban labour markets.

The age structure of India's population reflects the demographic transition in progress. The proportion of children (0 to 14 years) has fallen from 41.2 percent in 1971 to 26.2 percent in 2021 (estimated), while the proportion of working-age population (15 to 64 years) has risen from 56 percent to approximately 65 percent. This is the demographic dividend: a temporarily favourable ratio of working-age to dependent population that boosted economic growth in East Asian countries during their rapid development phase. India's demographic dividend window is expected to peak around 2030. Realising this dividend requires creating sufficient productive employment for the approximately 10 to 12 million new entrants to the labour force each year, which remains a major policy challenge. The elderly population (65 and above) is growing rapidly in proportional terms, from about 4.5 percent in 1971 to an estimated 8 to 9 percent in 2021, with projections suggesting it will rise to 14 to 16 percent by 2040, creating significant demands on pension systems, healthcare, and eldercare that India's institutional framework is not yet equipped to handle. The dependency ratio (ratio of non-working population to working-age population) is improving currently but will worsen as ageing accelerates from the 2030s onward.

Occupational structure of India's population shows a gradual shift from agriculture toward industry and services, though agriculture still employs about 45 to 50 percent of the workforce (2019-20 Periodic Labour Force Survey). The share of agricultural employment has been falling but remains much higher than in comparable middle-income economies, reflecting the low productivity of non-farm employment creation and barriers to labour mobility. Services (trade, transport, finance, government, education, health) employ about 33 to 35 percent, and industry (manufacturing, construction, mining) about 24 to 27 percent. A characteristic of India's occupational structure is the high proportion of self-employment and informal employment: over 90 percent of the workforce is in the informal economy with no job security, social security, or regulated wages. Female labour force participation rate (FLFPR) is low and has been declining: from about 35 percent in 2005-06 to approximately 25 to 30 percent in 2019-20 (varied by source), reflecting increased female education (more time in school reduces early workforce entry), reduced agricultural opportunities for women as male migrants take urban jobs, and social norms discouraging female employment outside the home.

Internal and International Migration

Migration is the movement of people from one place to another with the intention of settling, temporarily or permanently, in the destination. It is a fundamental demographic process reshaping India's population distribution and is increasingly recognised as a key driver of economic development, urbanisation, and social change. The 2011 Census counted 453.6 million internal migrants (those who have moved from their place of birth to their current place of residence), equivalent to 37.5 percent of India's total population. When migration over the previous 5 years is measured, approximately 55.8 million people moved in 2011, making India one of the largest internal migration systems in the world.

Internal migration is classified by streams: rural to rural (the most common, primarily marriage migration of women from one village to another, which accounts for the largest share of total internal migration in India); rural to urban (economically the most significant, as workers move from villages to cities seeking better wages and opportunities); urban to urban (skilled workers moving between cities for career advancement, common among professionals); and urban to rural (relatively rare, occurring among retirees returning to their place of origin, or during economic crises such as the COVID-19 reverse migration of 2020 when an estimated 10 to 15 million circular migrants returned to their home states when urban employment collapsed). Rural to urban migration is the primary driver of urbanisation.

The major corridors of internal migration in India reflect the economic geography of the country. The most important origin states are Uttar Pradesh (sends the largest number of migrants to other states, especially construction workers and domestic workers), Bihar (sends large numbers of agricultural labourers, rickshaw pullers, and construction workers), Rajasthan (sends migrant labour to Gujarat, Maharashtra, and Delhi), Odisha (sends tribal and non-tribal labour to construction sites and brick kilns across India), Jharkhand, and the northeastern states. The major destination states and cities are: Maharashtra (Mumbai receives migrants from UP, Bihar, Karnataka, Andhra Pradesh, and Rajasthan for construction, textile mills, domestic work, and informal trade); Delhi-NCR (receives migrants from UP, Bihar, Haryana, and Rajasthan for construction, services, and government employment); Gujarat (receives migrants from Rajasthan, MP, and UP for diamond polishing, textile, and petrochemical industries); Tamil Nadu (receives migrants from Bihar and UP for construction, and from Kerala for domestic work); and Kerala itself, despite being a major sender of international migrants, is now a net receiver of inter-state migrants (called Guest Workers or New Plantation Workers) from Bengal, Odisha, UP, Bihar, Jharkhand, and Assam working in construction, hospitality, and domestic services.

The causes of migration are understood through the push-pull framework: push factors at origin include agricultural underemployment and disguised unemployment, low farm wages, land fragmentation, drought and crop failure, caste discrimination and social exclusion (Dalits and tribal communities face limited economic opportunity in their home areas), lack of non-farm employment, and poor access to health and education services. Pull factors at destination include higher wages (urban wages for unskilled construction labour are 2 to 4 times higher than rural agricultural wages), employment in construction, manufacturing, and services, access to education and healthcare, freedom from village-level social hierarchy, and the network effects of established migrant communities from the same origin village (migration is strongly social-network dependent). Lee's theory (1966) formally describes migration as the result of the interaction of push and negative factors at origin, pull and negative factors at destination, intervening obstacles (distance, cost, information), and personal factors.

Seasonal and circular migration is extremely widespread in India, particularly among the rural poor. Agricultural labourers from Rajasthan, Bihar, UP, Odisha, and MP move seasonally to construction sites, sugar mills, brick kilns, and agricultural operations in western India, returning to their home villages after a few months. This circularity means migrants maintain roots in both origin and destination, remit income to rural families, but do not settle permanently in cities. The scale of circular migration became dramatically visible during the COVID-19 lockdown of March 2020, when the abrupt shutdown of construction and informal activities caused an estimated 10 to 15 million circular migrants to attempt to return to their home states on foot, cycle, and whatever transport was available, in one of the largest mass migrations in post-Independence Indian history. The event exposed the complete absence of social protection, data systems, and institutional support for this massive population of unregistered, invisible workers.

The consequences of migration for sending regions include: remittance flows that constitute a significant and stable source of income for rural households in Bihar, UP, Odisha, and Rajasthan (remittances are more stable than agricultural income, are not subject to monsoon risk, and provide capital for housing, education, and social ceremonies); reduction of surplus agricultural labour and upward pressure on rural wages in high-migration areas; but also a brain drain of the most economically active and entrepreneurial young men, leaving behind the elderly, women, children, and the less able-bodied; feminisation of agriculture (women taking over agricultural management in the absence of migrant men); and disruption of social fabric and traditional support systems. For receiving areas, migrants provide essential labour for construction, domestic services, and informal trade, but also create pressure on urban housing, infrastructure, public services, and social cohesion, and are often the targets of nativist political movements (Shiv Sena in Maharashtra historically campaigned against North Indian migrants in Mumbai; Assam has experienced severe ethnic conflict between indigenous Assamese and Bengali migrants, including the 1983 Nellie massacre).

International migration from India falls into two major streams. The Gulf migration stream (comprising the Gulf Cooperation Council countries: Saudi Arabia, UAE, Kuwait, Qatar, Bahrain, Oman) is the largest in terms of total migrants: approximately 8 to 9 million Indians work in the Gulf, predominantly from Kerala, Tamil Nadu, Andhra Pradesh, Karnataka, and increasingly UP and Bihar. They are primarily semi-skilled and unskilled workers (construction, domestic labour, hospitality, retail) employed on temporary contracts under the kafala (sponsorship) system that ties their legal status to their employer, creating vulnerability to exploitation. Remittances from the Gulf are the single largest source of international remittances to India: India received approximately 87 billion dollars in remittances in 2022, the highest of any country in the world, and Gulf countries account for approximately 50 percent of this. Kerala's economy has been heavily shaped by Gulf migration for four decades: the Kerala Model of development (high human development indicators despite modest income levels) was sustained partly by Gulf remittances that funded education, healthcare, and social consumption. However, the Norka Roots data (the non-resident Keralite affairs department) and surveys show that Gulf migration is declining for Keralites as their education levels rise and they qualify for higher-skilled migration to Western countries, while being replaced by lower-income migrant workers from north India who are willing to work for the wages that Gulf employers offer.

The diaspora migration stream to Western countries (United States, United Kingdom, Canada, Australia, Germany, Netherlands) is smaller in absolute numbers but higher in economic and cultural influence. The Indian diaspora in the United States numbers approximately 4.4 million (USCIS data) and is the highest-earning ethnic group in America, concentrated in technology (approximately 15 to 20 percent of Silicon Valley startups are founded by Indian-origin entrepreneurs; Indian-Americans have led major technology companies including Microsoft, Google, Adobe, IBM, and Mastercard), medicine, academia, and professional services. The UK Indian diaspora of approximately 1.5 million has historically been concentrated in retail trade, manufacturing, and medicine. The NRI (Non-Resident Indian) category under Indian law refers to Indian citizens living abroad for more than 182 days per year; the Person of Indian Origin (PIO) and now Overseas Citizen of India (OCI) categories cover people of Indian descent who are citizens of other countries. OCI card holders enjoy most of the rights of Indian residents except voting and holding constitutional posts. The Indian diaspora maintains strong cultural and economic ties to India through Pravasi Bharatiya Divas (annual NRI convention) and the Global Indian Diaspora Forum.

Brain drain is a significant concern: India trains large numbers of engineers (about 1.5 million engineering graduates per year) and doctors, a substantial proportion of whom emigrate to Western countries where earnings are far higher. The export of human capital to wealthy countries represents a transfer of the social investment India made in their education, though it is argued that remittances, knowledge transfer, and the overseas Indian networks that facilitate trade and investment partially compensate. Brain gain or brain circulation (the return of experienced diaspora members bringing capital, skills, and networks) has become more significant since India's economic liberalisation.

Population Policy

India was the first country in the world to launch an official national family planning programme in 1952, reflecting the Nehruvian government's recognition that rapid population growth would undermine economic development. The early programme was voluntary and educational, emphasising the use of contraception through information campaigns. The adoption of targets for contraceptive acceptors and sterilisations from the 1960s onwards shifted the programme toward a more coercive character in some states. The National Population Policy 1976 under Prime Minister Indira Gandhi's government led to the Emergency period (1975-77) sterilisation drive in which an estimated 6 to 8 million sterilisations were performed, many under compulsion or with insufficient informed consent, including a disproportionate targeting of Muslim and Dalit men. This coercive campaign was a major factor in the Congress party's defeat in the 1977 elections, and it permanently damaged trust in family planning programmes particularly among Muslim communities, leading to chronic underprovision in subsequent years to avoid political controversy.

The National Population Policy 2000 (NPP 2000), adopted under the Atal Bihari Vajpayee government, marked a paradigm shift from a target-driven approach to a rights-based, reproductive health framework informed by the 1994 International Conference on Population and Development (ICPD) Programme of Action. NPP 2000 set demographic goals for 2010: a TFR of 2.1 (replacement level), IMR of 30, MMR of 100, and universal immunisation coverage. It explicitly abandoned numerical targets for sterilisations and contraceptive use, recognising that voluntary, informed choice coupled with high-quality services was both ethically correct and more effective than coercion. The policy emphasised meeting unmet need for contraception, improving the quality of family welfare services, empowering women through education and economic opportunities, and integrating population policy with development programmes in education, health, nutrition, and rural development.

The Mission Parivar Vikas programme (2016) targets 145 high-fertility districts in the seven states with the highest TFR (Uttar Pradesh, Bihar, Madhya Pradesh, Rajasthan, Jharkhand, Chhattisgarh, and Assam), providing basket of choice contraceptives, strengthening healthcare infrastructure, and deploying community health workers. The Janani Suraksha Yojana (JSY, 2005) provides cash incentives to below-poverty-line women for institutional delivery, increasing hospital births from 41 percent in 2005-06 to about 89 percent in 2019-21, significantly reducing maternal and neonatal mortality. The Pradhan Mantri Matru Vandana Yojana (PMMVY) provides financial support to pregnant and lactating women for the first live birth. The POSHAN Abhiyaan (National Nutrition Mission, 2018) addresses the nutritional underpinnings of high IMR and stunting, which affects about 35 percent of children under five in India.

Several state governments have introduced two-child norms for eligibility for government jobs, panchayat membership, or government benefits. Rajasthan, Haryana, Andhra Pradesh, Odisha, Uttarakhand, Telangana, Gujarat, and Assam have at various times enacted such laws. These policies are controversial: critics argue that they disproportionately penalise the poor and the less educated (who have more children out of genuine unmet need or son preference), potentially exclude entire communities from political representation, may encourage sex-selective abortion to limit family size to two sons, and violate the reproductive rights affirmed by ICPD 1994. The Supreme Court of India upheld the constitutionality of such norms in Javed vs State of Haryana (2003), ruling that the two-child norm for panchayat elections did not violate the Constitution. However, the Union government itself has consistently rejected a national two-child law, preferring education, health, and empowerment-based approaches.

Concerns about an alleged demographic imbalance between religious communities have been a recurring theme in political discourse. The argument made by some political groups is that Muslims have higher fertility rates and are therefore a growing share of the population, threatening Hindu demographic majority. The factual picture is more nuanced: the Muslim TFR has fallen from 4.4 in 1992 to 2.36 in 2015-16 (NFHS-4), while the Hindu TFR fell from 3.3 to 2.1 in the same period. The differential is narrowing rapidly and is primarily explained by the lower average education, income, and urbanisation levels of the Muslim population rather than by religion per se. NCERT data and the Economic Survey both confirm that socioeconomic determinants of fertility operate similarly across religious groups when controlled for education and income. The proportion of Muslims in India's population has grown gradually from 9.8 percent in 1951 to 14.2 percent in 2011, but official projections do not support fears of dramatic demographic change. The Pew Research Center projects that India's Muslim share will rise to about 18 percent by 2050 while Hindus remain at approximately 77 percent.

Population ageing is an emerging challenge that current population policy is beginning to address. The National Policy for Senior Citizens 2011 and subsequent Vayoshreshtha Samman scheme recognise the needs of the elderly. The government is developing Pradhan Mantri Jan Arogya Yojana (Ayushman Bharat) coverage for the elderly and expanding Atal Pension Yojana and National Pension System coverage to the informal sector workforce to provide old-age income security. However, India lacks universal old-age pension and healthcare coverage, meaning that most elderly Indians depend on family support - a system under stress as nuclear families become more common, migration separates generations, and longevity increases the duration of support needed.

Scheduled Castes and Scheduled Tribes

Scheduled Castes (SCs) are communities that have historically been subjected to the practice of untouchability under the Hindu caste system, placed at the bottom of the ritual hierarchy, restricted to certain occupations (scavenging, leatherwork, sweeping), denied access to common resources (wells, temples, public spaces), and subjected to pervasive social discrimination. The Constitution of India abolished untouchability under Article 17 and empowered Parliament to specify the communities entitled to reservation and other protective provisions under Articles 15(4), 16(4), and 46. The Presidential Orders (1950, as amended) listing Scheduled Castes restrict SC status to those belonging to the Hindu, Sikh (from 1956), and Buddhist (from 1990) religions. The exclusion of Christian and Muslim converts from SC status has been a recurring controversy addressed by the National Commission for Religious and Linguistic Minorities (Ranganath Misra Commission, 2007) which recommended extension of SC reservations to SC converts to Christianity and Islam, a recommendation not yet implemented. The 2011 Census recorded India's SC population at 201.4 million, constituting 16.6 percent of the total population.

SCs are distributed across all states but with significant concentration in Uttar Pradesh (20.7 million SCs, the most numerous in any state), West Bengal, Bihar, Tamil Nadu, and Andhra Pradesh. As a proportion of state population, Punjab has the highest share of SCs at 31.9 percent (reflecting the concentration of Dalit communities in the Punjabi agrarian economy and the historical migration of untouchable communities to Punjab following land redistribution after partition). Mizoram, Meghalaya, and Nagaland have the lowest SC shares (below 1 percent) because these are tribal Christian states where the Hindu caste hierarchy does not apply. The major SC communities include Chamars and Jatavs (leatherworkers, concentrated in UP), Madigas and Malas (Andhra Pradesh and Telangana), Mahars (Maharashtra, from whose community B.R. Ambedkar himself came), Paraiyars and Pallars (Tamil Nadu), Dusadhs and Musahars (Bihar), and Doms and Nats (UP and Bihar). These communities practised occupations associated with impurity by caste ideology and faced systematic exclusion from resources and opportunities.

The socioeconomic indicators of SCs show persistent gaps despite seven decades of constitutional protection and affirmative action. In 2011, SC literacy (66.1 percent) trailed the national average (74 percent); SC sex ratio was 945 (above national average of 940, a statistical artefact partly of higher female mortality rates in higher-caste communities); SC infant mortality rates are significantly higher than upper-caste communities. Land ownership is extremely skewed: despite land reform policies in most states, land distribution data consistently shows SCs owning far less agricultural land per capita than upper-caste communities, confining many to the status of landless agricultural labourers. Atrocities against SCs, tracked by the National Crime Records Bureau, show stubbornly high rates of crimes including assault, rape, and murder, particularly in states with strong caste hierarchies such as Uttar Pradesh, Bihar, and Rajasthan. The Scheduled Castes and Scheduled Tribes (Prevention of Atrocities) Act 1989, and its amended 2016 version, provide enhanced penalties and special courts to address atrocity cases, though conviction rates remain low. The Manual Scavenging prohibition remains incompletely enforced: the Prohibition of Employment as Manual Scavengers and their Rehabilitation Act 2013 bans the manual cleaning of human waste from dry latrines and sewer lines, but surveys indicate that this practice continues in parts of India and causes numerous deaths annually from asphyxiation in sewers.

Scheduled Tribes (STs) are communities identified as tribal (adivasi) that have been historically isolated from mainstream society due to geographical remoteness (hills, forests, and difficult terrain) and distinct cultural, linguistic, and social systems. Constitutional provisions under Articles 15(4), 16(4), 46, and especially the Fifth and Sixth Schedules (which provide special governance arrangements for tribal areas) recognise the distinct needs of tribal communities for protection from exploitation and for development support. The Presidential Orders listing Scheduled Tribes are state-specific (a community may be ST in one state but not in another). The 2011 Census counted India's ST population at 104.3 million, constituting 8.6 percent of the total population.

The major ST groups by population are: Gond (central India - Madhya Pradesh, Chhattisgarh, Maharashtra, Telangana), Bhil (western India - Rajasthan, Gujarat, Madhya Pradesh, Maharashtra), Santhals (Jharkhand, West Bengal, Odisha), Mina (Rajasthan), Oraon (Jharkhand, Odisha), Munda (Jharkhand), Khond (Odisha), and Naga, Mizo, Khasi, Garo, and Bodo communities in the northeast. The northeast is the region with the highest proportion of STs: Mizoram (94.4 percent), Nagaland (86.5 percent), Meghalaya (86.2 percent), Arunachal Pradesh (68.8 percent), and Manipur (35.1 percent) are the most tribal states. In peninsular India, Odisha (22.9 percent), Jharkhand (26.2 percent), Chhattisgarh (30.6 percent), and Madhya Pradesh (21.1 percent) have large tribal populations concentrated in the forested upland areas of the Satpura-Vindhya and Chhota Nagpur plateaus.

The most critical challenge facing tribal communities is the conflict between development imperatives and tribal land rights and livelihoods. Tribal communities have historically depended on forests for food, fuelwood, medicinal plants, and minor forest produce (tendu leaves, mahua flowers, honey), and many are shifting cultivators. Industrialisation, mining, dam construction, and infrastructure projects in tribal areas have repeatedly involved the displacement of tribal communities, often inadequately compensated and insufficiently rehabilitated. The Narmada Dam controversy (displacing tribal communities of the Narmada valley), the Vedanta bauxite mining conflict in Niyamgiri Hills (Kondh tribe, Odisha), and coal mining displacement in Jharkhand and Chhattisgarh exemplify this conflict. The Scheduled Tribes and Other Traditional Forest Dwellers (Recognition of Forest Rights) Act 2006 (Forest Rights Act) was enacted to recognise the historical forest rights of tribal communities that had been denied by colonial and post-colonial forest legislation; it grants individual titles to forest land under cultivation (up to 4 hectares) and community rights over community forest resources. Implementation has been contested and incomplete, with many claims rejected at state level.

The Particularly Vulnerable Tribal Groups (PVTGs, formerly Primitive Tribal Groups) are 75 identified tribal communities with especially low population, pre-agricultural technology, declining or stagnant population, low literacy, and subsistence economy. Examples include the Shompen (Nicobar Islands), Sentinelese (North Sentinel Island, famous for their complete rejection of outside contact), Jarawas (Andaman Islands, whose contact history has been deeply controversial), Birhor (Jharkhand), Chenchu (Andhra Pradesh, Telangana, Odisha), and Bondas (Odisha). PVTGs receive special schemes under the Ministry of Tribal Affairs. The Sentinelese case has raised ethical debates about the rights of isolated peoples to remain so versus the paternalistic impulse of the state to develop them; the death of American missionary John Allen Chau on North Sentinel Island in 2018 brought this debate to global attention.

Reservation (affirmative action) for SCs and STs covers: seats in the Lok Sabha and Vidhan Sabhas (SCs: 84 Lok Sabha seats; STs: 47 Lok Sabha seats, allocated in proportion to their population share in each state constituency); seats in government services at all levels (SCs: 15 percent; STs: 7.5 percent); and seats in central government educational institutions (SCs: 15 percent; STs: 7.5 percent). The Creamy Layer concept, which excludes the most economically advanced members from reservations, applies to OBC reservations but not to SC and ST reservations on the principle that caste-based discrimination operates regardless of economic status. Sub-categorisation of SC reservations (allocating a portion within the 15 percent to the most disadvantaged SC communities) has been debated and the Supreme Court's 2024 judgment in State of Punjab vs Davinder Singh affirmed that states can sub-classify within the SC category to ensure the most disadvantaged communities benefit. This overturned the earlier E.V. Chinnaiah vs State of Andhra Pradesh (2004) ruling that had held SC to be a homogeneous class.

Linguistic and Religious Diversity

India's linguistic diversity is among the greatest of any country on earth. The 2011 Census recorded 19,569 mother tongues, of which the Linguistic Survey of India recognises several hundred distinct languages. The Eighth Schedule of the Constitution lists 22 scheduled languages entitled to official recognition and promotion: Assamese, Bengali, Bodo, Dogri, Gujarati, Hindi, Kannada, Kashmiri, Konkani, Maithili (added 2003), Malayalam, Manipuri, Marathi, Nepali, Odia, Punjabi, Sanskrit, Santali (added 2003), Sindhi, Tamil, Telugu, and Urdu. Hindi is the most widely spoken, with about 528 million people claiming it as mother tongue in the 2011 Census, though this figure includes many who speak dialects (Bhojpuri, Maithili, Awadhi, Rajasthani) that are linguistically distinct from Standard Hindi. Bengali (97 million), Marathi (83 million), Telugu (81 million), Tamil (69 million), Gujarati (55 million), Urdu (51 million), Kannada (44 million), Odia (38 million), and Malayalam (35 million) are the other major languages by number of speakers in 2011.

The four main language families present in India are: Indo-Aryan (spoken by approximately 75 percent of the population, derived from Sanskrit and constituting the northern and central languages - Hindi, Bengali, Marathi, Gujarati, Punjabi, Rajasthani, Odia, Assamese, Sindhi, Kashmiri, Nepali, Maithili, Bhojpuri, Konkani, Urdu); Dravidian (spoken by approximately 20 percent of the population in the southern states - Tamil, Telugu, Kannada, Malayalam, and tribal Dravidian languages like Gondi, Kui, Kurukh, and Brahui in Balochistan); Austroasiatic or Austro-Asiatic (spoken by tribal communities in central and northeastern India - Santali, Mundari, Ho, Khasi, Meghalayan languages, and Khmer-related languages); and Sino-Tibetan or Tibeto-Burman (spoken in the northeastern states and Himalayan border areas - Manipuri/Meitei, Bodo, Boro, Tripuri, Naga languages, Mizo, Lepcha, Sikkimese). The Andaman Islands have several unique language families (Great Andamanese, Ongan) that may be related to very early modern human populations and are critically endangered.

The three-language formula, recommended by the Education Commission (Kothari Commission, 1966) and included in national education policy, proposes that students should learn three languages: the mother tongue or regional language, Hindi (or in Hindi-speaking states, another modern Indian language), and English. Implementation has been contentious, particularly in the southern states where political parties have resisted compulsory Hindi on the grounds of linguistic rights and the fear that Hindi-belt students have an unfair advantage in Hindi examinations. Tamil Nadu has consistently opposed the three-language formula and implemented a two-language (Tamil and English) policy in state schools. The National Education Policy 2020 affirms the three-language formula while stating that no language will be imposed, attempting to balance linguistic integration with respect for linguistic autonomy.

The States Reorganisation Act 1956, based largely on the recommendations of the States Reorganisation Commission (Fazal Ali Commission, 1953-55), redrew state boundaries along linguistic lines, creating linguistically homogeneous states on the principle that language is the most important basis for administrative unity, democratic governance, and cultural development. Before 1956, states were a mix of former British provinces (administrative units) and princely states (diverse in size and language). After 1956, the major linguistic states of the south (Andhra Pradesh for Telugu, Karnataka for Kannada, Kerala for Malayalam, Tamil Nadu for Tamil) were created or consolidated. Subsequent agitations led to further reorganisations: Bombay state was divided into Maharashtra (Marathi) and Gujarat (Gujarati) in 1960; Punjab was divided into Punjab (Punjabi, Sikh-majority) and Haryana (Hindi, Hindu-majority) in 1966 with Chandigarh as Union Territory serving as capital of both. The northeastern states were reorganised multiple times, and Jharkhand, Uttarakhand, and Chhattisgarh were carved from Bihar, UP, and MP respectively in 2000, reflecting tribal, hill, and regional identities rather than strictly linguistic ones.

Religious diversity in India is constitutionally protected under Articles 25 to 28 (freedom of conscience and religion) and Articles 29 and 30 (rights of minorities to establish and administer educational institutions). The 2011 Census recorded: Hindus at 79.8 percent (966.3 million); Muslims at 14.2 percent (172.2 million, the world's third largest Muslim population after Indonesia and Pakistan); Christians at 2.3 percent (27.8 million, concentrated in Kerala, Tamil Nadu, northeastern states - Nagaland, Mizoram, Meghalaya are predominantly Christian - and Goa); Sikhs at 1.7 percent (20.8 million, concentrated in Punjab where they constitute about 58 percent of the state population); Buddhists at 0.7 percent (8.4 million, significantly boosted by the mass conversion led by B.R. Ambedkar in 1956 when he and approximately 600,000 followers converted to Buddhism in Nagpur, a movement that has grown since; also strong in Sikkim, Arunachal Pradesh, Jammu and Kashmir, and Ladakh); Jains at 0.4 percent (4.5 million, geographically concentrated in Gujarat, Rajasthan, and Maharashtra, economically influential far beyond their numbers due to their concentration in trade and commerce); and others including tribal religions (Sarna and related practices for which a separate religion code was demanded in Census 2021), Zoroastrians (Parsis, approximately 57,000 in 2011, concentrated in Mumbai, among the smallest but most economically influential communities in India), and Jews (a tiny community with ancient roots in Kerala, known as Cochin Jews, and in Mumbai, the Bene Israel and Baghdadi Jews).

The geography of religion in India shows clear regional patterns. The Muslim-majority regions are Jammu and Kashmir (Muslim majority in the Kashmir Valley, Hindu majority in Jammu, Buddhist majority in Ladakh), Lakshadweep (96.2 percent Muslim), and certain districts in West Bengal (Murshidabad, Malda), Uttar Pradesh (western UP), Kerala, and Assam (districts along the Bangladesh border). The Muslim population is concentrated in the Deccan (Hyderabad, Aurangabad), Bengal (Kolkata, 24-Parganas), Bihar, and Kerala in addition to the north Indian belt. Christian communities dominate the northeast (Nagaland 87.9 percent Christian, Mizoram 87.2 percent, Meghalaya 74.6 percent, Manipur 41.3 percent) and are substantial in Kerala (18.4 percent, with ancient roots tracing the St. Thomas tradition to 52 CE), Tamil Nadu (6.1 percent), Jharkhand, Odisha, and Chhattisgarh (Christian missions have had significant success in converting tribal communities). Sikh communities are geographically concentrated in Punjab with substantial diaspora communities in Delhi, Haryana, and Maharashtra. Buddhist communities are concentrated in Maharashtra (Navayana Buddhists - Ambedkarite), and in the Himalayan fringe (Sikkim, Arunachal, Ladakh - Mahayana Tibetan Buddhism).

Communal tensions and religious violence have been a recurring feature of Indian political life since Independence, rooted in the traumatic experience of partition and in political mobilisation of religious identity. Major episodes of communal violence include: the direct action day violence and partition riots of 1946-47; the anti-Sikh pogroms following Indira Gandhi's assassination in 1984; the Ayodhya movement and post-Babri Masjid demolition riots of 1992-93 in Mumbai, Surat, and other cities; the Gujarat riots of 2002 following the Godhra train burning in which over 1,000 people (overwhelmingly Muslim) were killed; the Muzaffarnagar riots of 2013; and various other episodes of smaller-scale violence. The National Integration Council (NIC) and various peace committees at state and district level have been established to monitor and prevent communal violence. The Prevention of Communal and Targeted Violence (Access to Justice and Reparations) Bill 2011 was drafted to provide legal framework for preventing organised communal violence and providing reparations to victims, but it was not passed due to political opposition. The Constitution's secular framework, the Supreme Court's consistent upholding of equality and non-discrimination, and civil society organisations working on communal harmony provide important but imperfect counterweights to political exploitation of religious divisions.

India's linguistic and religious diversity is constitutionally managed through the framework of secularism (Article 25-30, Preamble), federalism (linguistic states with powers over their own languages), reservation for SCs, STs, and OBCs, recognition of personal law (different personal law codes for Hindus, Muslims, Christians, and Parsis in matters of marriage, divorce, inheritance - though the Supreme Court in the Shah Bano case 1985, the Triple Talaq case 2017 and the Shayara Bano judgment have progressively limited discriminatory personal law practices), and protection of minority educational institutions. The debate over Uniform Civil Code (UCC), mandated by Article 44 as a Directive Principle, remains one of the most sensitive in Indian constitutional law: the BJP has historically advocated a UCC on grounds of gender justice and national integration, while Muslim personal law bodies and minority communities generally oppose it as an intrusion on religious freedom. Uttarakhand became the first state to enact a UCC in 2024, though its scope and impact remain to be determined.